Re: VS: [mapserver-users] Mapserver search performance

[Varun saraf]

Hi Andreas,

I have looked and looked but could not find how to use ogr2ogr to do
the operation I am interested in. Could you point me in the right
direction here as to how can ogr2ogr be used to add new fields to an
existing dbf file from another dbf file. The external dbf file from
which I need to fetch data does not have a corresponding shp file
associated with it. Its just a simple data file that has a common
field with the shp file attributes.

Varun

On Wed, May 4, 2011 at 4:23 AM, Eichner, Andreas - SID-NLKM
andreas.eich...@sid.sachsen.de wrote:

 Hi. The first thing to note: editing a DBF with Excel  Co. seems to be
 a _really_ bad idea. Those who tried that got Shapes wired to wrong
 attribute lines. So DBF, SHP, SHX and QIX files have to be used as a
 whole or will usually end up in a corrupted dataset. I would suggest
 ogr2ogr from the GDAL suite. It's fast, reliable, can do joins and is
 aware of the mentioned dependencies.
 Please note that such a fileset can only provide a spatial index via a
 QIX file. This is OK if you only want to filter by BBOX. If you want to
 filter by attribute all lines of the DBF still need to be scanned. In
 such cases it's wise to use ogr2ogr to split the data in pre-filtered
 sets.
 Using a more sophisticated database like PostGIS or SpatialLite can help
 you implement more complex scenarios. Since MapServer has no native
 driver for SpatialLite it's probably not as fast as it is supposed to
 be. This mostly depends on OGRs implementation.

 Greetings

 Is there a DBF editor out
 there that can be used to import the fields from any external data
 source into the shapefile attribute DBF without affecting the
 structure? I looked for a lot but they do not have the capability of
 doing a JOIN based on a common field and pulling data into the
 shapefile DBF automatically.

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Re: VS: [mapserver-users] Mapserver search performance

[Varun saraf]

Hi,

Thanks a lot Andreas. That JOIN was the culprit as you rightly
suggested. Once I removed the join, the performance increased
exponentially. The 5 minute cgi run now took under 5 seconds which is
simply amazing. I just need one more help. Is there a DBF editor out
there that can be used to import the fields from any external data
source into the shapefile attribute DBF without affecting the
structure? I looked for a lot but they do not have the capability of
doing a JOIN based on a common field and pulling data into the
shapefile DBF automatically. My company cannot afford the ArcGis
software.

Thanks,
Varun

On Fri, Apr 15, 2011 at 2:40 AM, Eichner, Andreas - SID-NLKM
andreas.eich...@sid.sachsen.de wrote:

 Hi,

 AFAIK dBase files don't provide an index themselves and there's no other
 way to provide one. shptree only creates an spatial index. Therefore
 only queries like 'does this geometry touch/intersect/lie within a given
 rectangle'can be accelerated.

 I tried the shptree tool but did not see any performance improvement.

 So this becomes clear: By doing a JOIN MapServer basically runs a loop:
 for each geometry that matches search withing external data for a line
 matching the join condition.

 Could it be because all of this information that I require is coming
 from an external DBF file that I join to the layer/shape's DBF? Will
 including all these fields/information in the shape's DBF file itself
 help?

 I'm pretty sure that this would help, since this would avoid the
 (unaccelerated) join. With a database like PostgreSQL/PostGIS or SQlite
 it's basically the same problem: if you don't create an appropriate
 index for the join condition, this becomes an costly operation. Although
 those columns are usually primary and foreign key columns with
 appropriate index and the join condition is usually a simple equality
 match.

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Re: VS: [mapserver-users] Mapserver search performance

[Varun saraf]

Hi,

Thanks a lot for the quick help. I am a PHP/Java guy. I shall try my
luck with some sort of PHP scripting as I need a solution fairly
quickly. I had made the suggestion of shifting to a PostGIS system
quite some time back but I guess you know how it is with approvals :)

Thanks again,
Varun

On Tue, May 3, 2011 at 4:42 PM, Mr. Puneet Kishor punk.k...@gmail.com wrote:

 On May 3, 2011, at 3:36 PM, Varun saraf wrote:

 Hi Puneet,

 Thanks a lot for the prompt reply. I tried using Excel 2007 and was
 not able to re-save the dbf file after editing. Also, I am having DBF
 files with about a million records and Excel tends to hang for these
 operations.


 Now you tell us ;-). My sense is that most gui-based tools will choke on 
 million+ rows. You might well want to upgrade to a Pg/PostGIS solution at 
 some point, but I realize that is not what you are asking for... (also, I 
 believe the most recent Excel versions might have lost the DBF translation 
 capabilities -- I am not an Excel person, so I can't confirm... besides, I 
 use Macs, and Excel is most likely hobbled on Macs anyway).


 Is there some tool other than Excel which can do these
 operations?


 I remember using Perl and XBase.pm to do this. It was really very quick and 
 trivial, but it was a long time ago. Choose your language of choice. Try R.





 Thanks,
 Varun

 On Tue, May 3, 2011 at 4:27 PM, Mr. Puneet Kishor punk.k...@gmail.com 
 wrote:

 On May 3, 2011, at 3:19 PM, Varun saraf wrote:

 ..Is there a DBF editor out
 there that can be used to import the fields from any external data
 source into the shapefile attribute DBF without affecting the
 structure? I looked for a lot but they do not have the capability of
 doing a JOIN based on a common field and pulling data into the
 shapefile DBF automatically.

 Just use MS-Excel or any program that can open up and write DBF. As long as 
 you are careful to not change the number of rows, just add additional 
 columns, and make sure the column names are not changed, and follow the 
 various DBF limitations, you should be ok. Make sure to keep a backup of 
 the original DBF in case things go ka-pow!

 Since the DBF data and the geometry are in separate files, there is no 
 issue with adding more attributes provide you follow the care noted above.
 ..



 Puneet.


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Re: VS: [mapserver-users] Mapserver search performance

[Varun saraf]

Hi,

I tried the shptree tool but did not see any performance improvement.
It fetched results about 4-5 seconds faster. Without QIX files, it was
5 minutes and with QIX files, it took about 4 minutes and 56 seconds.
All of my requests are based on the MAPSHAPE parameter in NQUERY
mode. I noticed that mapserver was taking about 1 second for
outputting the information in the template file for each feature.
Could it be because all of this information that I require is coming
from an external DBF file that I join to the layer/shape's DBF? Will
including all these fields/information in the shape's DBF file itself
help? Does mapserver pick up each feature and use a point in polygon
approach to check if it lies in the provided shape? If yes, how can i
make this process faster. Is there a way of making it multi-threaded
or do more checks per second?

I am providing sample code. Hope this helps. I have about 35 layers in
my map file. Should I merge all these into a single layer?

MAP FILE

LAYER
NAME L1
METADATA
qstring_validation_pattern '.'
END
STATUS DEFAULT
TYPE point
DATA BLKS_01
TOLERANCE 0
TOLERANCEUNITS METERS
CLASS
   STYLE
  OUTLINECOLOR 255 0 0
END 
END

JOIN
NAME external
TABLE data/externalData.dbf
FROM Field1
TO Field1
TYPE ONE-TO-ONE
END

TEMPLATE blockTemplate.xml
END

Template File
==
[GEOID],[Field1],[LON],[LAT],[external_ID],[external_NAME],[external_STA],[external_NEEDSCORE],[external_MINSCORE];

Request
===
http://localhost/cgi-bin/mapserv.exe?map=C:/ms4w/apps/GIS/centroides.mapmode=nquerymapshape=-99.757833
32.474433 -99.758005 32.450679 -99.726591 32.447637 -99.727621
32.474723

Any help in this regard is greatly appreciated. Let me know if you
need any more information.

Thanks,
Varun

On Mon, Apr 11, 2011 at 3:06 PM, Varun saraf vsaraf@gmail.com wrote:
 Thanks a lot for the quick reply. I will give it a try.

 On Mon, Apr 11, 2011 at 1:50 PM, Rahkonen Jukka
 jukka.rahko...@mmmtike.fi wrote:
 Hi,

 Shptree will help and stopwatch will tell you how much. Without spatial
 index Mapserver needs to go through the whole shapefile every time. Have
 a try, it will not take very many seconds to run shptree. Make different
 requests, take times with and without .qix files and you will some
 numbers. Change the requests and request order (query 1 with
 .qix/withour qix, query 2 without .qix/with .qix) so that you can see if
 you are actually testing the speed of disk access and memory cache
 access and not the effect of having spatial index.
 By adding DEBUG 5 for your layer you don't need stopwatch but you'll get
 timings into ms_errorfile.


 -Jukka Rahkonen-

 Varun saraf wrote:


 Hello Everyone,

 I have programmed a GIS application using Mapserver, Google maps and
 Tilecache. The functionality of this GIS application is to extract the
 data (from the dbf file) for all features (Points) within a randomly
 drawn user shape and doing some statistical operation on that data. I
 use an NQUERY mode with MAPSHAPE attribute to get all the data for the
 user drawn shape. Mapserver takes aout 5-10 seconds for a small shape
 (a couple of square miles) but as the shape gets bigger (hundreds of
 square miles), the time taken to fetch all data related to the
 features/points lying in the shape grows exponentially (Upto 2 hours
 for some shapes). Until now, we were restricting the maximum area a
 shape can have but we have to get rid of that. Is there a way to
 improve the performance in any way? Will SHPTREE work for this
 purpose? The features are currently points only but we may move to
 polygons in future. We use the .shp files for the shapes. Is it
 advantageous to move to a database instead? If yes, what database
 works best?

 What I did notice is that for any given request to mapserver, however
 large the shape, the CPU utilization never crosses 12%. Can we improve
 performance by increasing the RAM or maybe move to a solid state hard
 drive? There is also the possibility of moving this application to
 Cloud computing. Anything that will improve the performance actually.
 Can someone point me in the right direction as to what might be the
 current bottleneck?

 T current setup is on windows and uses MS4W on an Apache server.

 Thanks,
 Varun
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[mapserver-users] Mapserver search performance

[Varun saraf]

Hello Everyone,

I have programmed a GIS application using Mapserver, Google maps and
Tilecache. The functionality of this GIS application is to extract the
data (from the dbf file) for all features (Points) within a randomly
drawn user shape and doing some statistical operation on that data. I
use an NQUERY mode with MAPSHAPE attribute to get all the data for the
user drawn shape. Mapserver takes aout 5-10 seconds for a small shape
(a couple of square miles) but as the shape gets bigger (hundreds of
square miles), the time taken to fetch all data related to the
features/points lying in the shape grows exponentially (Upto 2 hours
for some shapes). Until now, we were restricting the maximum area a
shape can have but we have to get rid of that. Is there a way to
improve the performance in any way? Will SHPTREE work for this
purpose? The features are currently points only but we may move to
polygons in future. We use the .shp files for the shapes. Is it
advantageous to move to a database instead? If yes, what database
works best?

What I did notice is that for any given request to mapserver, however
large the shape, the CPU utilization never crosses 12%. Can we improve
performance by increasing the RAM or maybe move to a solid state hard
drive? There is also the possibility of moving this application to
Cloud computing. Anything that will improve the performance actually.
Can someone point me in the right direction as to what might be the
current bottleneck?

T current setup is on windows and uses MS4W on an Apache server.

Thanks,
Varun
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Re: VS: [mapserver-users] Mapserver search performance

[Varun saraf]

Thanks a lot for the quick reply. I will give it a try.

On Mon, Apr 11, 2011 at 1:50 PM, Rahkonen Jukka
jukka.rahko...@mmmtike.fi wrote:
 Hi,

 Shptree will help and stopwatch will tell you how much. Without spatial
 index Mapserver needs to go through the whole shapefile every time. Have
 a try, it will not take very many seconds to run shptree. Make different
 requests, take times with and without .qix files and you will some
 numbers. Change the requests and request order (query 1 with
 .qix/withour qix, query 2 without .qix/with .qix) so that you can see if
 you are actually testing the speed of disk access and memory cache
 access and not the effect of having spatial index.
 By adding DEBUG 5 for your layer you don't need stopwatch but you'll get
 timings into ms_errorfile.


 -Jukka Rahkonen-

 Varun saraf wrote:


 Hello Everyone,

 I have programmed a GIS application using Mapserver, Google maps and
 Tilecache. The functionality of this GIS application is to extract the
 data (from the dbf file) for all features (Points) within a randomly
 drawn user shape and doing some statistical operation on that data. I
 use an NQUERY mode with MAPSHAPE attribute to get all the data for the
 user drawn shape. Mapserver takes aout 5-10 seconds for a small shape
 (a couple of square miles) but as the shape gets bigger (hundreds of
 square miles), the time taken to fetch all data related to the
 features/points lying in the shape grows exponentially (Upto 2 hours
 for some shapes). Until now, we were restricting the maximum area a
 shape can have but we have to get rid of that. Is there a way to
 improve the performance in any way? Will SHPTREE work for this
 purpose? The features are currently points only but we may move to
 polygons in future. We use the .shp files for the shapes. Is it
 advantageous to move to a database instead? If yes, what database
 works best?

 What I did notice is that for any given request to mapserver, however
 large the shape, the CPU utilization never crosses 12%. Can we improve
 performance by increasing the RAM or maybe move to a solid state hard
 drive? There is also the possibility of moving this application to
 Cloud computing. Anything that will improve the performance actually.
 Can someone point me in the right direction as to what might be the
 current bottleneck?

 T current setup is on windows and uses MS4W on an Apache server.

 Thanks,
 Varun
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[mapserver-users] Boundary overlay shift

[Varun saraf]

Hello,

I have been using Mapserver with Tilecache and Google maps to display
polygon boundary overlays for some time now. However, the users
complain that the overlay is not accurate if they zoom in to the map
(zoom level 14 onwards). Is this a problem with the projection scheme
being used? I think my data is in epsg 4326 format. What projection
scheme does google maps use? Its strange that everything looks fine at
the higher levels but when I zoom in beyond level 13, the boundary
gets misaligned though the shape of the boundaries is accurate. Has
anyone solved this problem? If yes, it would be great if you can point
me in the correct direction.

BTW, I use ms4w for windows and the GtileOverlay method with tilecache
to render the boundary overlays.

Thanks,
Varun
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[mapserver-users] Google Maps Tile overlay shift

[Varun saraf]

Hi,

For some time now, I have been using Mapserver with Tilecache and
Google maps to display census tract overlays to users. However, the
users complain that the overlay is not accurate if they zoom into the
map (say level 13 onwards). Is this a problem with the projection
scheme being used? I think my data is in epsg 4326 format and google
uses 900913 I think. I insrted this into the Proj 4 epsg file but
still the overlays are shifted by a bit. If anyone who has solved this
problem can direct me, it would be a great help.

BTW, I use ms4w for windows and the GtileOverlay method with tilecache.

Thanks,
Varun
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[mapserver-users] Custom Draw Shape by User

[Varun saraf]

Hi,

I am using mapserver as tile layer (USA county boundaries) on google
maps. I have been given a requirement where a user, can go to a
specific zoom level on the maps and draw a custom shape (mostly a
poygon Using GPolygon) on google maps. I then need to provide the user
with an average data of all the counties that fall within this custom
shape. Now, I can fetch the data for every county the user clicks on,
but if the user does not click on a county but it still falls within
the custom shape, is there a way for me to know the same?? Is there a
way to provide this custom shape to mapserver using the geo latitude
and longitide, so mapserver itself can give me the list of all
counties that fall within this?

Please help me in this regard.

Thanks,
Varun
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[mapserver-users] Class level Transparency/Opacity

[Varun saraf]

Hello,

Is it possible to set a transparency rate for the CLASS level Color?
Below is my mapfile. I am using this layer on google maps in tile
mode. When I do so, the base map is getting completely overlapped by
the colored polygons. I need a level of transparency so that the base
map's roads and location are visible. In other words, I only want to
highlight the polygons that match the expression criteria. Can someone
tell me what I need to do for the same? I have already tried putting
in OPACITY field in the layer object but it only lightens the color
without making it transparent. an OPACITY of 1 renders the polygons
white in color.

MAP
   NAME drawBothMap
   TRANSPARENT ON
   IMAGETYPE PNG

   PROJECTION
 init=epsg:4326
   END

   LAYER
   NAME USABOTH
   STATUS DEFAULT
   METADATA
   wms_title example_layer
   END
   TYPE polygon
   DATA USA

   CLASSITEM QCT

   CLASS
 EXPRESSION '1'
 COLOR 255 0 0
   END

   CLASS
 EXPRESSION '2'
 COLOR 0 255 0
   END

   CLASS
 EXPRESSION '3'
 COLOR 0 0 255
   END
   END
END

Thanks,
Varun
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[mapserver-users] Class level Transparency/Opacity

[Varun saraf]

Hello,

Is it possible to set a transparency rate for the CLASS level Color?
Below is my mapfile. I am using this layer on google maps in tile
mode. When I do so, the base map is getting completely overlapped by
the colored polygons. I need a level of transparency so that the base
map's roads and location are visible. In other words, I only want to
highlight the polygons that match the expression criteria. Can someone
tell me what I need to do for the same? I have already tried putting
in OPACITY field in the layer object but it only lightens the color
without making it transparent. an OPACITY of 1 renders the polygons
white in color.

MAP
NAME drawBothMap
TRANSPARENT ON
IMAGETYPE PNG

PROJECTION
  init=epsg:4326
END

LAYER
NAME USABOTH
STATUS DEFAULT
METADATA
wms_title example_layer
END
TYPE polygon
DATA USA

CLASSITEM QCT

CLASS
  EXPRESSION '1'
  COLOR 255 0 0
END

CLASS
  EXPRESSION '2'
  COLOR 0 255 0
END

CLASS
  EXPRESSION '3'
  COLOR 0 0 255
END
END
END

Thanks,
Varun
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Re: [mapserver-users] Precache

[Varun saraf]

Hi Roger,

I am trying to get my mapserver and tilecache work together but its
somehow not working. I am using the same projection as you in all my
layers and the mapfile. (This works when I call my mapserver directly
from google and hence the projection is right).

Here is my mapfile (Only things that might be important).

MAP
EXTENT -173 5 -45 75

IMAGETYPE PNG

PROJECTION
  init=epsg:4326
END

WEB
METADATA
 wms_srs EPSG:4326 EPSG:900913
END

END

LAYER

PROJECTION
init=epsg:4326
END
END

Next I added the 900913 epsg to the proj.4 of mapserver and made the
required changes in tilecache.cfg file as you specified.

[google-tiles]
type=MapServerLayer
mapfile=C:/ms4w/apps/QCTGIS/drawMap.map
metaTile=true
metaSize=2,2
metaBuffer=0,500
layers=tr20_d00
spherical_mercator=true
srs=EPSG:900913

I am not sure if the linkn I am using is wrong. I have tilecache
installed in the cgi directory of the apache server that was installed
using ms4. The example index.html that comes with tilecache works
fine and I can see the images being cached. Also my mapserver directly
works fine. Can you tell me what is it that I am doing wrong here? the
link I use for the tileUrlTemplate in google maps is
http://127.0.0.1:8123/cgi-bin/tilecache-2.10/tilecache.cgi/1.0.0/google-tiles/{Y}/{X}/{Z}.png?type=google;.
I can also see that this call gets initiated in the apache logs
(access.log) but nothing happens therafter. I don't even know if this
is failing at tilecache end and mapserver isn't being called at all or
at mapserver's end where the image is not being sent by mapserver. Can
you help me out here?

Thanks a lot.
Varun

On Thu, May 21, 2009 at 12:46 PM, Roger Andréran...@gmail.com wrote:
 Ahh, ok.  I'm not sure in what fashion you are using TileCache, but my
 experience has been with using it to create tiles to display in Google
 Maps.  Google Maps uses the projection which is EPSG:900913.  I
 believe there are other codes for it, but that is the one I use.

 All of my source data for the MapServer projects I make are in
 EPSG:4326.  So there are 3 things I need to do in order to make the
 Tilecache output tiles align correctly in Gmaps.

 1. I set both the mapfile and the layer projections to EPSG:4326.
 MAP
  NAME  'v2_80m_global'
  PROJECTION
    init=epsg:4326
  END

  LAYER
    NAME 'imagery'
    PROJECTION
      init=epsg:4326
    END
 snip...

 2. I explicity allow for a wms request to be made for the layer in
 EPSG:900913 by setting the following in my MapServer LAYER:
    METADATA
      wms_srs             EPSG:4326 EPSG:900913
 snip...

 3. I define my TileCache layer so that it requests images from
 Mapserver in EPSG:900913.
 [v2_20m_global]
 type=MapServerLayer
 mapfile=/var/www/mapfiles/v2_20m_global/v2_20m_global.map
 metaTile=true
 metaSize=2,2
 metaBuffer=0,500
 layers=imagery
 spherical_mercator=true
 srs=EPSG:900913

 That's what works for me.

 Roger
 --

 On Thu, May 21, 2009 at 5:24 AM, Chad Clabaugh cclaba...@centwire.com wrote:
 Thank you Roger, for your response.  I have done that but I do not
 understand how tilecache works.  The images that are returned from mapserver
 line up perfectly. But the images returned from tilecache do not align very
 well (they're distorted).  If tilecache is simply caching the returned
 images then I do not understand where this distortion comes from.  Any
 thoughts?

 Thanks!

 -Original Message-
 From: Roger André [mailto:ran...@gmail.com]
 Sent: Wednesday, May 20, 2009 11:46 PM
 To: Chad Clabaugh
 Cc: mapserver-users@lists.osgeo.org
 Subject: Re: [mapserver-users] Precache

 Your request is somewhat lacking in detail, but assuming that your
 goal is a simple one, here is one way to accomplish this.

 1. Create a MapServer project that displays your shapefile in whatever
 style you choose.
 2. Setup a TileCache instance that points to your MapServer project.
 3. Run the tilecache_seed.py script to pre-generate tiles.

 Roger
 --

 On Wed, May 20, 2009 at 12:16 PM, Chad Clabaugh cclaba...@centwire.com
 wrote:
 How can I precache tile images from shapefiles?



 Thanks



 Chad Clabaugh

 Technical Support, Engineering

 Office: 260.760.6398

 Mobile: 260.466.8861



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Re: [mapserver-users] Precache

[Varun saraf]

Hello,

I have got this (tilecache with mapserver on google maps) working
finally after a lot of problems but I now really need to know about
how to do a pre-cache of all the tiles from mapserver. I am running
tilecache 2.10 on Windows with mapserver ms4w from maptools.org. I
tried running tilecache_seed.py as per the suggestion above but it
always ends up in the following error

Traceback (most recent call last):
  File C:\ms4w\Apache\cgi-bin\tilecache-2.10\tilecache_seed.py, line 9, in mo
dule
TileCache.Client.main()
  File C:\ms4w\Apache\cgi-bin\tilecache-2.10\TileCache\Client.py, line 153, in
 main
layer = svc.layers[args[0]]
IndexError: list index out of range

Any help in this regard would be great.

Thanks,
Varun

On Fri, Jun 19, 2009 at 2:39 PM, Varun sarafvsaraf@gmail.com wrote:
 Hi Roger,

 I am trying to get my mapserver and tilecache work together but its
 somehow not working. I am using the same projection as you in all my
 layers and the mapfile. (This works when I call my mapserver directly
 from google and hence the projection is right).

 Here is my mapfile (Only things that might be important).

 MAP
    EXTENT -173 5 -45 75

    IMAGETYPE PNG

    PROJECTION
      init=epsg:4326
    END

    WEB
    METADATA
     wms_srs             EPSG:4326 EPSG:900913
    END
 
    END

    LAYER
 
        PROJECTION
            init=epsg:4326
        END
    END

 Next I added the 900913 epsg to the proj.4 of mapserver and made the
 required changes in tilecache.cfg file as you specified.

 [google-tiles]
 type=MapServerLayer
 mapfile=C:/ms4w/apps/QCTGIS/drawMap.map
 metaTile=true
 metaSize=2,2
 metaBuffer=0,500
 layers=tr20_d00
 spherical_mercator=true
 srs=EPSG:900913

 I am not sure if the linkn I am using is wrong. I have tilecache
 installed in the cgi directory of the apache server that was installed
 using ms4. The example index.html that comes with tilecache works
 fine and I can see the images being cached. Also my mapserver directly
 works fine. Can you tell me what is it that I am doing wrong here? the
 link I use for the tileUrlTemplate in google maps is
 http://127.0.0.1:8123/cgi-bin/tilecache-2.10/tilecache.cgi/1.0.0/google-tiles/{Y}/{X}/{Z}.png?type=google;.
 I can also see that this call gets initiated in the apache logs
 (access.log) but nothing happens therafter. I don't even know if this
 is failing at tilecache end and mapserver isn't being called at all or
 at mapserver's end where the image is not being sent by mapserver. Can
 you help me out here?

 Thanks a lot.
 Varun

 On Thu, May 21, 2009 at 12:46 PM, Roger Andréran...@gmail.com wrote:
 Ahh, ok.  I'm not sure in what fashion you are using TileCache, but my
 experience has been with using it to create tiles to display in Google
 Maps.  Google Maps uses the projection which is EPSG:900913.  I
 believe there are other codes for it, but that is the one I use.

 All of my source data for the MapServer projects I make are in
 EPSG:4326.  So there are 3 things I need to do in order to make the
 Tilecache output tiles align correctly in Gmaps.

 1. I set both the mapfile and the layer projections to EPSG:4326.
 MAP
  NAME  'v2_80m_global'
  PROJECTION
    init=epsg:4326
  END

  LAYER
    NAME 'imagery'
    PROJECTION
      init=epsg:4326
    END
 snip...

 2. I explicity allow for a wms request to be made for the layer in
 EPSG:900913 by setting the following in my MapServer LAYER:
    METADATA
      wms_srs             EPSG:4326 EPSG:900913
 snip...

 3. I define my TileCache layer so that it requests images from
 Mapserver in EPSG:900913.
 [v2_20m_global]
 type=MapServerLayer
 mapfile=/var/www/mapfiles/v2_20m_global/v2_20m_global.map
 metaTile=true
 metaSize=2,2
 metaBuffer=0,500
 layers=imagery
 spherical_mercator=true
 srs=EPSG:900913

 That's what works for me.

 Roger
 --

 On Thu, May 21, 2009 at 5:24 AM, Chad Clabaugh cclaba...@centwire.com 
 wrote:
 Thank you Roger, for your response.  I have done that but I do not
 understand how tilecache works.  The images that are returned from mapserver
 line up perfectly. But the images returned from tilecache do not align very
 well (they're distorted).  If tilecache is simply caching the returned
 images then I do not understand where this distortion comes from.  Any
 thoughts?

 Thanks!

 -Original Message-
 From: Roger André [mailto:ran...@gmail.com]
 Sent: Wednesday, May 20, 2009 11:46 PM
 To: Chad Clabaugh
 Cc: mapserver-users@lists.osgeo.org
 Subject: Re: [mapserver-users] Precache

 Your request is somewhat lacking in detail, but assuming that your
 goal is a simple one, here is one way to accomplish this.

 1. Create a MapServer project that displays your shapefile in whatever
 style you choose.
 2. Setup a TileCache instance that points to your MapServer project.
 3. Run the tilecache_seed.py script to pre-generate tiles.

 Roger
 --

 On Wed, May 20, 2009 at 12:16 PM, Chad Clabaugh cclaba...@centwire.com
 wrote:
 How can I precache tile images 

Re: [mapserver-users] Finding the centroid given the feature

[Varun saraf]

Center of the geometry works perfect. I need to get access to any
point inside the polygon feature. I believe I can use an itemQuery on
mapserver to query the attribute but how does mapserver return the
center point? Do I need to create an HTML template for that too?

On Mon, Jun 1, 2009 at 4:11 PM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 MapServer templates can produce a center point for a geometry but it's not a 
 true centroid but those
 aren't guaranteed to be in the polygon. MapScript could be used as well I 
 suppose. In either case you'd
 send a lookup request to the CGI or MapScript, do an attribute query and 
 return whatever you'd need.

 Steve

 On 5/29/2009 at 9:32 AM, in message
 6db14d250905290732pb01747wce200eddfe73d...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 I am using mapserver 5.0 with google maps and the data source is the
 US Census tracts as shape files and dbf files.

 On Thu, May 28, 2009 at 2:12 PM, Steve Lime steve.l...@dnr.state.mn.us
 wrote:
 What version are you using? What data source?

 Steve

 On 5/28/2009 at 10:01 AM, in message
 6db14d250905280801q3660a6a7ycbcd5f5a238c5...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Hi,

 I know mapserver uses a point-in-polygon method to find a feature
 given a set of co-ordinates, but can it do the same thing reversed?
 For example. Each polygon I draw has a number associated with it which
 is in a dbf file with the same name as the shp file that mapserver
 uses to draw the polygons. My current map file allows me to fetch that
 unique number whenever I pass the co-ordinates of any point inside
 that polygon (mapserver uses the point-in-polygon method to fetch me
 the polygonID). The query I use is

 http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/workshop-5.0/testMa
 p.mapmode=querymapxy=-77.098617
 38.87795

 where mapxy keeps changing based on the user's click. The html
 template I send just has the variable name [polygonID] which helps me
 get the polygon ID of the point I specify in the mapxy variable. Now,
 is there a way in which I can send this polygonID to mapserver and get
 hold of any point (perhaps the centroid) inside of this polygon? Can
 someone point me in the right direction here?

 Thanks a lot.

 -Varun
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 http://lists.osgeo.org/mailman/listinfo/mapserver-users


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Re: [mapserver-users] Finding the centroid given the feature

[Varun saraf]

Thanks a lot Steve. I am able to use the itemquery to fetch the other
attributes correctly but somehow, the center of polygon isn't working
right. Its returning to me, the co-ordinates that are outside the
bounds of the mapping application. All my data is in the actual
geographic co-ordinate system followed by Google maps and it returns a
latitude/longitude pair corresponsing to some place in Antarctica. Any
idea on what might be wrong?

On Tue, Jun 2, 2009 at 1:50 PM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 Yes, you'd need to create a template for that. You could return JSON, XML, 
 csv or whatever. This would
 be the most straightfoward using 5.2 or ideally 5.4.1 (due out today) and the 
 new style templates. You
 could create a template output format to use like so:

 OUTPUTFORMAT
  NAME 'geom_center'
  DRIVER 'TEMPLATE'
  MIMETYPE 'text/plain'
  FORMATOPTION 'FILE=geom_center.tmpl'
 END

 where geom_center.tmpl might look like:

 !-- MapServer Template --
 [shpmidx],[shpmidy]

 and your query would look like:

 http://.../cgi-bin/mapserv?map=foo.map...itemquery 
 stuff...qformat=geom_center

 Steve

 On 6/2/2009 at 12:17 PM, in message
 6db14d250906021017kb56f49ak36b4d0e4be417...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Center of the geometry works perfect. I need to get access to any
 point inside the polygon feature. I believe I can use an itemQuery on
 mapserver to query the attribute but how does mapserver return the
 center point? Do I need to create an HTML template for that too?

 On Mon, Jun 1, 2009 at 4:11 PM, Steve Lime steve.l...@dnr.state.mn.us 
 wrote:
 MapServer templates can produce a center point for a geometry but it's not a
 true centroid but those
 aren't guaranteed to be in the polygon. MapScript could be used as well I
 suppose. In either case you'd
 send a lookup request to the CGI or MapScript, do an attribute query and
 return whatever you'd need.

 Steve

 On 5/29/2009 at 9:32 AM, in message
 6db14d250905290732pb01747wce200eddfe73d...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 I am using mapserver 5.0 with google maps and the data source is the
 US Census tracts as shape files and dbf files.

 On Thu, May 28, 2009 at 2:12 PM, Steve Lime steve.l...@dnr.state.mn.us
 wrote:
 What version are you using? What data source?

 Steve

 On 5/28/2009 at 10:01 AM, in message
 6db14d250905280801q3660a6a7ycbcd5f5a238c5...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Hi,

 I know mapserver uses a point-in-polygon method to find a feature
 given a set of co-ordinates, but can it do the same thing reversed?
 For example. Each polygon I draw has a number associated with it which
 is in a dbf file with the same name as the shp file that mapserver
 uses to draw the polygons. My current map file allows me to fetch that
 unique number whenever I pass the co-ordinates of any point inside
 that polygon (mapserver uses the point-in-polygon method to fetch me
 the polygonID). The query I use is

 http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/workshop-5.0/testMa
 p.mapmode=querymapxy=-77.098617
 38.87795

 where mapxy keeps changing based on the user's click. The html
 template I send just has the variable name [polygonID] which helps me
 get the polygon ID of the point I specify in the mapxy variable. Now,
 is there a way in which I can send this polygonID to mapserver and get
 hold of any point (perhaps the centroid) inside of this polygon? Can
 someone point me in the right direction here?

 Thanks a lot.

 -Varun
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


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 mapserver-users@lists.osgeo.org
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Re: [mapserver-users] Finding the centroid given the feature

[Varun saraf]

I had my mapfile extent changed and it worked Perfect. Thanks a lot
Steve. It was a great help!

On Tue, Jun 2, 2009 at 4:16 PM, Varun saraf vsaraf@gmail.com wrote:
 Thanks a lot Steve. I am able to use the itemquery to fetch the other
 attributes correctly but somehow, the center of polygon isn't working
 right. Its returning to me, the co-ordinates that are outside the
 bounds of the mapping application. All my data is in the actual
 geographic co-ordinate system followed by Google maps and it returns a
 latitude/longitude pair corresponsing to some place in Antarctica. Any
 idea on what might be wrong?

 On Tue, Jun 2, 2009 at 1:50 PM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 Yes, you'd need to create a template for that. You could return JSON, XML, 
 csv or whatever. This would
 be the most straightfoward using 5.2 or ideally 5.4.1 (due out today) and 
 the new style templates. You
 could create a template output format to use like so:

 OUTPUTFORMAT
  NAME 'geom_center'
  DRIVER 'TEMPLATE'
  MIMETYPE 'text/plain'
  FORMATOPTION 'FILE=geom_center.tmpl'
 END

 where geom_center.tmpl might look like:

 !-- MapServer Template --
 [shpmidx],[shpmidy]

 and your query would look like:

 http://.../cgi-bin/mapserv?map=foo.map...itemquery 
 stuff...qformat=geom_center

 Steve

 On 6/2/2009 at 12:17 PM, in message
 6db14d250906021017kb56f49ak36b4d0e4be417...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Center of the geometry works perfect. I need to get access to any
 point inside the polygon feature. I believe I can use an itemQuery on
 mapserver to query the attribute but how does mapserver return the
 center point? Do I need to create an HTML template for that too?

 On Mon, Jun 1, 2009 at 4:11 PM, Steve Lime steve.l...@dnr.state.mn.us 
 wrote:
 MapServer templates can produce a center point for a geometry but it's not 
 a
 true centroid but those
 aren't guaranteed to be in the polygon. MapScript could be used as well I
 suppose. In either case you'd
 send a lookup request to the CGI or MapScript, do an attribute query and
 return whatever you'd need.

 Steve

 On 5/29/2009 at 9:32 AM, in message
 6db14d250905290732pb01747wce200eddfe73d...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 I am using mapserver 5.0 with google maps and the data source is the
 US Census tracts as shape files and dbf files.

 On Thu, May 28, 2009 at 2:12 PM, Steve Lime steve.l...@dnr.state.mn.us
 wrote:
 What version are you using? What data source?

 Steve

 On 5/28/2009 at 10:01 AM, in message
 6db14d250905280801q3660a6a7ycbcd5f5a238c5...@mail.gmail.com, Varun 
 saraf
 vsaraf@gmail.com wrote:
 Hi,

 I know mapserver uses a point-in-polygon method to find a feature
 given a set of co-ordinates, but can it do the same thing reversed?
 For example. Each polygon I draw has a number associated with it which
 is in a dbf file with the same name as the shp file that mapserver
 uses to draw the polygons. My current map file allows me to fetch that
 unique number whenever I pass the co-ordinates of any point inside
 that polygon (mapserver uses the point-in-polygon method to fetch me
 the polygonID). The query I use is

 http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/workshop-5.0/testMa
 p.mapmode=querymapxy=-77.098617
 38.87795

 where mapxy keeps changing based on the user's click. The html
 template I send just has the variable name [polygonID] which helps me
 get the polygon ID of the point I specify in the mapxy variable. Now,
 is there a way in which I can send this polygonID to mapserver and get
 hold of any point (perhaps the centroid) inside of this polygon? Can
 someone point me in the right direction here?

 Thanks a lot.

 -Varun
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


 ___
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 mapserver-users@lists.osgeo.org
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Re: [mapserver-users] Finding the centroid given the feature

[Varun saraf]

I am using mapserver 5.0 with google maps and the data source is the
US Census tracts as shape files and dbf files.

On Thu, May 28, 2009 at 2:12 PM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 What version are you using? What data source?

 Steve

 On 5/28/2009 at 10:01 AM, in message
 6db14d250905280801q3660a6a7ycbcd5f5a238c5...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Hi,

 I know mapserver uses a point-in-polygon method to find a feature
 given a set of co-ordinates, but can it do the same thing reversed?
 For example. Each polygon I draw has a number associated with it which
 is in a dbf file with the same name as the shp file that mapserver
 uses to draw the polygons. My current map file allows me to fetch that
 unique number whenever I pass the co-ordinates of any point inside
 that polygon (mapserver uses the point-in-polygon method to fetch me
 the polygonID). The query I use is

 http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/workshop-5.0/testMa
 p.mapmode=querymapxy=-77.098617
 38.87795

 where mapxy keeps changing based on the user's click. The html
 template I send just has the variable name [polygonID] which helps me
 get the polygon ID of the point I specify in the mapxy variable. Now,
 is there a way in which I can send this polygonID to mapserver and get
 hold of any point (perhaps the centroid) inside of this polygon? Can
 someone point me in the right direction here?

 Thanks a lot.

 -Varun
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


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[mapserver-users] Finding the centroid given the feature

[Varun saraf]

Hi,

I know mapserver uses a point-in-polygon method to find a feature
given a set of co-ordinates, but can it do the same thing reversed?
For example. Each polygon I draw has a number associated with it which
is in a dbf file with the same name as the shp file that mapserver
uses to draw the polygons. My current map file allows me to fetch that
unique number whenever I pass the co-ordinates of any point inside
that polygon (mapserver uses the point-in-polygon method to fetch me
the polygonID). The query I use is

http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/workshop-5.0/testMap.mapmode=querymapxy=-77.098617
38.87795

where mapxy keeps changing based on the user's click. The html
template I send just has the variable name [polygonID] which helps me
get the polygon ID of the point I specify in the mapxy variable. Now,
is there a way in which I can send this polygonID to mapserver and get
hold of any point (perhaps the centroid) inside of this polygon? Can
someone point me in the right direction here?

Thanks a lot.

-Varun
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
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Re: [mapserver-users] Re: Dynamic data loading using Google maps andMapserver

[Varun saraf]

Hi All,

I am trying to integrate the census tracts on the google maps base. I
am using the tile mode and have successfully drawn the shape files
over the states of USA. I have some data in an access database that I
need to show to the user when he selects a particular census tract
(the shapes are polygons). However, since its a tile mode that I am
using on google maps, I am unable to understand how do I get the
information from mapserver as to which census tract was selected by
the user? Is there a way mapserver can send me the polygon selected
based on a co-ordinate lying inside the polygon? I know there is a way
by using queries and a querymap for doing this. The query that I am
using is as follows

http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/census/testMap.mapmode=querymapxy=38.87795
-77.098617

I am providing a template in my map file that has the tract variables.
However, the result is always the same

msQueryByPoint(): Search returned no results. No matching record(s)
found. Is it that mapserver is trying to look for a point feature in
the location specifies by mapxy in the link above? How do I make
mapserver to look for a polygon enclosing this co-ordinate and return
me the result? I am attaching my mapfile also for reference.

MAP
NAME testMap
STATUS ON
SIZE 600 300
EXTENT -84 37 -75 40
UNITS DD
SHAPEPATH data
IMAGECOLOR 255 255 255
CONFIG MS_ERRORFILE ms_error.txt

IMAGETYPE PNG

WEB
  IMAGEPATH /ms4w/tmp/ms_tmp/
  IMAGEURL /ms_tmp/
END

QUERYMAP
STATUS ON
STYLE HILITE
END

LAYER
NAME virginia
STATUS DEFAULT
TYPE polygon
DATA tr51_d00
DEBUG 5
TOLERANCE 1000
TOLERANCEUNITS pixels

TEMPLATE bodytemplate.html
HEADER imapheader.html
FOOTER imapfooter.html

CLASS
   STYLE
  OUTLINECOLOR 128 128 128
  COLOR 153 205 255
END
   TEMPLATE pointTemplate.html
END

END
END

Thanks,
Varun

On Mon, May 4, 2009 at 3:30 PM, Varun saraf vsaraf@gmail.com wrote:
 Hi Steve,

 If I provide Mapserver with a point x,y in WGS84 projection (from
 google maps) as a query, can mapserver give me the enclosing polygon
 information (using point-in-polygon method or something else)? If yes,
 how? I have already drawn the polygons on google map using tile mode.
 Can you suggest me a book/doc that helps with querying mapserver?

 Thanks,
 Varun

 On Sun, May 3, 2009 at 9:56 AM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 Both examples show how to do this. You have to create a query using
 the coordinate from Google to access MapServer. My example uses the
 principle to query points but would work for polygons (which are actually
 easier). You could issue straight MapServer queries:

  http://.../cgi-bin/mapserv?mode=querymap=something.mapmapxy=google_x+google_yqlayer=the_polygons

 or do a WFS query. Since you're already using straight MapServer the former
 would probably be easiest.

 Steve

 Varun saraf vsaraf@gmail.com 05/02/09 1:34 PM 
 Hi,

 Thanks a lot Jim and Steve. These are great examples but I am dividing
 each state of USA into about 1300 polygons and I need a way to find
 which polygon is selected by the user. I tried building Gpolygons
 using the polygon data that i have (after converting it into a GML
 file) but it makes Google damn slow to redraw the polygons on zoom in
 and zoom out. The tile mode in mapserver is much faster.

 Now, After I draw the polygon in tile mode using mapserver, Is there a
 way Mapserver can return to me the specific polygon info (say
 co-ordinates or any other data in the dbf file relating to that
 polygon) when I select it on google map? Goggle I believe can give me
 the exact co-ordinates of the point I clicked. Can mapserver use this
 point location to find which polygon was selected?

 Thanks,
 Varun

 2009/5/2 Jim Strevinas voas_...@hotmail.com:
 A beautiful example that uses the Google Maps API is:

 http://www.dyasdesigns.com/geoxml/gmlusa.htm

 It makes use of an API plugin called geoxml that can load XML data which can
 be produced by
 a WFS server. In the source code, a static GML file is used but a google
 search shows that it can
 connect to a live WFS server using the URL.

 Date: Sat, 2 May 2009 09:28:01 -0500
 From: steve.l...@dnr.state.mn.us
 To: vsaraf@gmail.com
 Subject: Re: [mapserver-users] Re: Dynamic data loading using Google maps
 andMapserver
 CC: mapserver-users@lists.osgeo.org

 One way to do that is to construct MapServer queries based on the event
 and submit them using AJAX. This site does just that but with OpenLayers:

 http://www.dnr.state.mn.us/waters/csg/index_copy.html

 Click on the dots and a MapServer query is done behind the scenes. If
 successful
 a little window control is populated, if not, then nothing happens. Simple
 templates
 are used to present the information.

 Steve

Re: [mapserver-users] Re: Dynamic data loading using Google maps andMapserver

[Varun saraf]

yes my data is in lat, long. I discovered the inverse lat long in
mapxy just after sending this email and tried it. It works now but the
New problem is that the result is a little tweaked. I guess its a
problem with the projection. The tract number is not the current one
when I click somewhere on the border of a tract. The projection is not
that big a problem for me right now. I need to get this thing up and
running by EOD with google maps (The dynamic clicking on the map etc).

Thanks a lot for the prompt reply.

On Thu, May 7, 2009 at 1:32 PM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 Something's backwards, you're mapxy is 38.87795, -77.098617 but your extents 
 are neg,pos,neg,pos? Also
 is your data in lat/lon?

 Steve

 On 5/7/2009 at 12:27 PM, in message
 6db14d250905071027j7ff0aac8j30edeb7f8c938...@mail.gmail.com, Varun saraf
 vsaraf@gmail.com wrote:
 Hi All,

 I am trying to integrate the census tracts on the google maps base. I
 am using the tile mode and have successfully drawn the shape files
 over the states of USA. I have some data in an access database that I
 need to show to the user when he selects a particular census tract
 (the shapes are polygons). However, since its a tile mode that I am
 using on google maps, I am unable to understand how do I get the
 information from mapserver as to which census tract was selected by
 the user? Is there a way mapserver can send me the polygon selected
 based on a co-ordinate lying inside the polygon? I know there is a way
 by using queries and a querymap for doing this. The query that I am
 using is as follows

 http://127.0.0.1:8123/cgi-bin/mapserv.exe?map=C:/ms4w/apps/census/testMap.map;
 mode=querymapxy=38.87795
 -77.098617

 I am providing a template in my map file that has the tract variables.
 However, the result is always the same

 msQueryByPoint(): Search returned no results. No matching record(s)
 found. Is it that mapserver is trying to look for a point feature in
 the location specifies by mapxy in the link above? How do I make
 mapserver to look for a polygon enclosing this co-ordinate and return
 me the result? I am attaching my mapfile also for reference.

 MAP
     NAME testMap
     STATUS ON
     SIZE 600 300
     EXTENT -84 37 -75 40
     UNITS DD
     SHAPEPATH data
     IMAGECOLOR 255 255 255
     CONFIG MS_ERRORFILE ms_error.txt

     IMAGETYPE PNG

     WEB
       IMAGEPATH /ms4w/tmp/ms_tmp/
       IMAGEURL /ms_tmp/
     END

     QUERYMAP
         STATUS ON
         STYLE HILITE
     END

     LAYER
         NAME virginia
         STATUS DEFAULT
         TYPE polygon
         DATA tr51_d00
         DEBUG 5
         TOLERANCE 1000
         TOLERANCEUNITS pixels

         TEMPLATE bodytemplate.html
         HEADER imapheader.html
         FOOTER imapfooter.html

         CLASS
          STYLE
             OUTLINECOLOR 128 128 128
             COLOR 153 205 255
           END
          TEMPLATE pointTemplate.html
       END

     END
 END

 Thanks,
 Varun

 On Mon, May 4, 2009 at 3:30 PM, Varun saraf vsaraf@gmail.com wrote:
 Hi Steve,

 If I provide Mapserver with a point x,y in WGS84 projection (from
 google maps) as a query, can mapserver give me the enclosing polygon
 information (using point-in-polygon method or something else)? If yes,
 how? I have already drawn the polygons on google map using tile mode.
 Can you suggest me a book/doc that helps with querying mapserver?

 Thanks,
 Varun

 On Sun, May 3, 2009 at 9:56 AM, Steve Lime steve.l...@dnr.state.mn.us 
 wrote:
 Both examples show how to do this. You have to create a query using
 the coordinate from Google to access MapServer. My example uses the
 principle to query points but would work for polygons (which are actually
 easier). You could issue straight MapServer queries:


 http://.../cgi-bin/mapserv?mode=querymap=something.mapmapxy=google_x+google_y
 qlayer=the_polygons

 or do a WFS query. Since you're already using straight MapServer the former
 would probably be easiest.

 Steve

 Varun saraf vsaraf@gmail.com 05/02/09 1:34 PM 
 Hi,

 Thanks a lot Jim and Steve. These are great examples but I am dividing
 each state of USA into about 1300 polygons and I need a way to find
 which polygon is selected by the user. I tried building Gpolygons
 using the polygon data that i have (after converting it into a GML
 file) but it makes Google damn slow to redraw the polygons on zoom in
 and zoom out. The tile mode in mapserver is much faster.

 Now, After I draw the polygon in tile mode using mapserver, Is there a
 way Mapserver can return to me the specific polygon info (say
 co-ordinates or any other data in the dbf file relating to that
 polygon) when I select it on google map? Goggle I believe can give me
 the exact co-ordinates of the point I clicked. Can mapserver use this
 point location to find which polygon was selected?

 Thanks,
 Varun

 2009/5/2 Jim Strevinas voas_...@hotmail.com:
 A beautiful example that uses the Google Maps API is:

 http

Re: [mapserver-users] Re: Dynamic data loading using Google maps andMapserver

[Varun saraf]

Hi Steve,

If I provide Mapserver with a point x,y in WGS84 projection (from
google maps) as a query, can mapserver give me the enclosing polygon
information (using point-in-polygon method or something else)? If yes,
how? I have already drawn the polygons on google map using tile mode.
Can you suggest me a book/doc that helps with querying mapserver?

Thanks,
Varun

On Sun, May 3, 2009 at 9:56 AM, Steve Lime steve.l...@dnr.state.mn.us wrote:
 Both examples show how to do this. You have to create a query using
 the coordinate from Google to access MapServer. My example uses the
 principle to query points but would work for polygons (which are actually
 easier). You could issue straight MapServer queries:

  http://.../cgi-bin/mapserv?mode=querymap=something.mapmapxy=google_x+google_yqlayer=the_polygons

 or do a WFS query. Since you're already using straight MapServer the former
 would probably be easiest.

 Steve

 Varun saraf vsaraf@gmail.com 05/02/09 1:34 PM 
 Hi,

 Thanks a lot Jim and Steve. These are great examples but I am dividing
 each state of USA into about 1300 polygons and I need a way to find
 which polygon is selected by the user. I tried building Gpolygons
 using the polygon data that i have (after converting it into a GML
 file) but it makes Google damn slow to redraw the polygons on zoom in
 and zoom out. The tile mode in mapserver is much faster.

 Now, After I draw the polygon in tile mode using mapserver, Is there a
 way Mapserver can return to me the specific polygon info (say
 co-ordinates or any other data in the dbf file relating to that
 polygon) when I select it on google map? Goggle I believe can give me
 the exact co-ordinates of the point I clicked. Can mapserver use this
 point location to find which polygon was selected?

 Thanks,
 Varun

 2009/5/2 Jim Strevinas voas_...@hotmail.com:
 A beautiful example that uses the Google Maps API is:

 http://www.dyasdesigns.com/geoxml/gmlusa.htm

 It makes use of an API plugin called geoxml that can load XML data which can
 be produced by
 a WFS server. In the source code, a static GML file is used but a google
 search shows that it can
 connect to a live WFS server using the URL.

 Date: Sat, 2 May 2009 09:28:01 -0500
 From: steve.l...@dnr.state.mn.us
 To: vsaraf@gmail.com
 Subject: Re: [mapserver-users] Re: Dynamic data loading using Google maps
 andMapserver
 CC: mapserver-users@lists.osgeo.org

 One way to do that is to construct MapServer queries based on the event
 and submit them using AJAX. This site does just that but with OpenLayers:

 http://www.dnr.state.mn.us/waters/csg/index_copy.html

 Click on the dots and a MapServer query is done behind the scenes. If
 successful
 a little window control is populated, if not, then nothing happens. Simple
 templates
 are used to present the information.

 Steve

  Varun saraf vsaraf@gmail.com 05/01/09 11:54 AM 
 Hi,

 I just had a look at ImageMap Template on Output generation...Can
 this be used on google maps to get information pooped up on a
 mouseover or mouseclick in tile mode? If not, what is it that I can do
 to get a similar result when using Mapserver with google maps?

 Regards,
 Varun

 On Thu, Apr 30, 2009 at 6:30 PM, Varun saraf vsaraf@gmail.com wrote:
  Hi,
 
  I have successfully drawn layers on of google maps as base using
  mapserver. However, I am trying to figure out how to get data
  dynamically displayed on the web page when a user clicks on a certain
  area. For example, I have divided the entire state of virginia into
  many sectors (using a polygon shp file). My requirement is that I want
  data to come up on the map/web page when the user selects a particular
  sector. I know google provides me with an event api for clicking on
  the map but how do I pass this event to mapserver so it can send me
  the label for that sector from the shape file? I need to be able to
  recognize what sector the user has clicked. Is this possible using
  just the mapserv cgi script and a map file or a MapScript has to be
  written/used? Can someone point me in the right direction here? Even
  providing the link for a previous discussion on this topic would help.
 
  Thanks,
  Varun
 
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 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users

 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users

 
 Invite your mail contacts to join your friends list with Windows Live
 Spaces. It's easy! Try it!
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo

Re: [mapserver-users] Re: Dynamic data loading using Google maps andMapserver

[Varun saraf]

Hi,

Thanks a lot Jim and Steve. These are great examples but I am dividing
each state of USA into about 1300 polygons and I need a way to find
which polygon is selected by the user. I tried building Gpolygons
using the polygon data that i have (after converting it into a GML
file) but it makes Google damn slow to redraw the polygons on zoom in
and zoom out. The tile mode in mapserver is much faster.

Now, After I draw the polygon in tile mode using mapserver, Is there a
way Mapserver can return to me the specific polygon info (say
co-ordinates or any other data in the dbf file relating to that
polygon) when I select it on google map? Goggle I believe can give me
the exact co-ordinates of the point I clicked. Can mapserver use this
point location to find which polygon was selected?

Thanks,
Varun

2009/5/2 Jim Strevinas voas_...@hotmail.com:
 A beautiful example that uses the Google Maps API is:

 http://www.dyasdesigns.com/geoxml/gmlusa.htm

 It makes use of an API plugin called geoxml that can load XML data which can
 be produced by
 a WFS server. In the source code, a static GML file is used but a google
 search shows that it can
 connect to a live WFS server using the URL.

 Date: Sat, 2 May 2009 09:28:01 -0500
 From: steve.l...@dnr.state.mn.us
 To: vsaraf@gmail.com
 Subject: Re: [mapserver-users] Re: Dynamic data loading using Google maps
 andMapserver
 CC: mapserver-users@lists.osgeo.org

 One way to do that is to construct MapServer queries based on the event
 and submit them using AJAX. This site does just that but with OpenLayers:

 http://www.dnr.state.mn.us/waters/csg/index_copy.html

 Click on the dots and a MapServer query is done behind the scenes. If
 successful
 a little window control is populated, if not, then nothing happens. Simple
 templates
 are used to present the information.

 Steve

  Varun saraf vsaraf@gmail.com 05/01/09 11:54 AM 
 Hi,

 I just had a look at ImageMap Template on Output generation...Can
 this be used on google maps to get information pooped up on a
 mouseover or mouseclick in tile mode? If not, what is it that I can do
 to get a similar result when using Mapserver with google maps?

 Regards,
 Varun

 On Thu, Apr 30, 2009 at 6:30 PM, Varun saraf vsaraf@gmail.com wrote:
  Hi,
 
  I have successfully drawn layers on of google maps as base using
  mapserver. However, I am trying to figure out how to get data
  dynamically displayed on the web page when a user clicks on a certain
  area. For example, I have divided the entire state of virginia into
  many sectors (using a polygon shp file). My requirement is that I want
  data to come up on the map/web page when the user selects a particular
  sector. I know google provides me with an event api for clicking on
  the map but how do I pass this event to mapserver so it can send me
  the label for that sector from the shape file? I need to be able to
  recognize what sector the user has clicked. Is this possible using
  just the mapserv cgi script and a map file or a MapScript has to be
  written/used? Can someone point me in the right direction here? Even
  providing the link for a previous discussion on this topic would help.
 
  Thanks,
  Varun
 
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users

 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users

 
 Invite your mail contacts to join your friends list with Windows Live
 Spaces. It's easy! Try it!
 ___
 mapserver-users mailing list
 mapserver-users@lists.osgeo.org
 http://lists.osgeo.org/mailman/listinfo/mapserver-users


___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users

[mapserver-users] Dynamic data loading using Google maps and Mapserver

[Varun saraf]

Hi,

I have successfully drawn layers on of google maps as base using
mapserver. However, I am trying to figure out how to get data
dynamically displayed on the web page when a user clicks on a certain
area. For example, I have divided the entire state of virginia into
many sectors (using a polygon shp file). My requirement is that I want
data to come up on the map/web page when the user selects a particular
sector. I know google provides me with an event api for clicking on
the map but how do I pass this event to mapserver so it can send me
the label for that sector from the shape file? I need to be able to
recognize what sector the user has clicked. Is this possible using
just the mapserv cgi script and a map file or a MapScript has to be
written/used? Can someone point me in the right direction here? Even
providing the link for a previous discussion on this topic would help.

Thanks,
Varun
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users