Re: [UMN_MAPSERVER-USERS] No reprojection done

Wed, 18 Jan 2006 08:12:23 -0800

Your map is EXTENT 0 0 40 40, how does this compare to the extents of you geotiff /var/www/html/india.tif. It is a geotiff or a tiff with a wld file right? 

-Steve W.

Apeksha Bhambhani wrote:

hii,
It seems that you have a lot of knowledge about projections in the mapfile . Could you please help us out . We have a few basic doubts. Here's what we are doing .... We are working on the LAMP platform. We are creating an interactive web application . Users will be provided with a map , on which they can make their own additions and deletions.For example , when a certain user wants to landmark a certain city . 
Could u help us out with a few of r doubts .
Firstly as the input to the Mapserver will be shapefiles , we will be creating our layers , (Eg. Point , Polygon , etc,) with the help of OpenEV.When the shapfiles are created in OpenEV (for e.g the points layer ) the points are saved on the basis of their line and column value This input will be given to the Mapfile of the Mapserver , which willl in turn give a complete image comprising of all the layers. This map can then be displayed using Php/Mapscript. When the user enters a certain point , the point details need to be added to MySql. We wanted to proceed step by step. Now , as we first need a base map ( on which the user will make his/her changes ) , which will be a raster image ( .png or .tif ). We have created a map file for this( the raster image as a raster layer) as follows: MAP NAME first 
EXTENT 0 0 40 40
SIZE 600 600
IMAGECOLOR 200 255 255
SHAPEPATH "/var/www/html/data1"
WEB 
            IMAGEPATH "/var/www/html/tmp/"
            IMAGEURL "/tmp/"
END LAYER 
NAME "base"
TYPE raster
DATA "/var/www/html/india.tif"
STATUS ON
END
END
This is not getting plotted , what could be the problem ? Also , what exactly is the use of extent , because no matter what extent we give for another mapfile to plot a simple rectangle , the size of the rectangle remains the same . 
Is projection mandatory in the mapfile ? And how can it be used .
When the shapfiles are created in OpenEV (for e.g the points layer ) the points are saved on the basis of their line and column value . Does this require the use of projection.How can these points be saved in their latitude/longitude values. 
 We are unable to understand the use of Projection ...Plz can u help us .
Awating your reply , 
Apeksha
*/Ed McNierney <[EMAIL PROTECTED]>/* wrote:

    Luiz  & Bengt -
I would expect that if Bengt is working with maps of Scandinavian 
    countries, the difference between Plat Carree and Mercator should be
    noticeable (Mercator will "stretch" things north/south by quite a
    bit compared to a "geographic" or Plat Carree projection).
Bengt, are you sure you have a good PROJ installation and that 
    MapServer is compiled with PROJ support (run mapserv -v and look for
    "SUPPORTS=PROJ")?
- Ed 
    Ed McNierney
    President and Chief Mapmaker
    TopoZone.com / Maps a la carte, Inc.
    73 Princeton Street, Suite 305
    North Chelmsford, MA  01863
    [EMAIL PROTECTED]
    (978) 251-4242

    ------------------------------------------------------------------------
    *From:* UMN MapServer Users List
    [mailto:[EMAIL PROTECTED] *On Behalf Of *Luiz Vaz
    *Sent:* Tuesday, January 17, 2006 12:46 AM
    *To:* [email protected]
    *Subject:* Re: [UMN_MAPSERVER-USERS] No reprojection done

    Well,

       it seems that there no perceptual changes each other:

    # World Mercator
    <54004> +proj=merc +lat_ts=0 +lon_0=0 +k=1.000000 +x_0=0 +y_0=0
    +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>

    # World Plate Carree
    <54001> +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>
    # World Equidistant Cylindrical
    <54002> +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>

    # WGS 84
    <4326> +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs  no_defs <>


    Best Regards,
    Luiz Vaz

    2006/1/15, Nilsson Bengt <[EMAIL PROTECTED]
    <mailto:[EMAIL PROTECTED]>>:

        Hi,
        I've set up a WMS server with an initial singe layer to test
        reprojection. However , I can't get the projection to work.
        Whatever output projection i try I get the same geographical
        (4326) back. For example, when I make a WMS
        request  with  SRS=EPSG:54004 (Mercator) and bounding box in
        that projection I get an 4326-map back. I do not get any errors.
        Here is my map-file:

        MAP
        NAME WMS-test
        STATUS ON
        SHAPEPATH "shp"
        IMAGECOLOR 255 255 255
        FONTSET ../etc/fontset.txt

        DEBUG ON
        WEB
          LOG "/tmp/mapserv.log"
          IMAGEPATH "/srv/www/htdocs/ms_tmp/"
          IMAGEURL "/ms_tmp/"
          METADATA
            "wms_title"     "Test"
            "wms_onlineresource"
        "http://hhhhhhhhh/mapserv/wt?service=WMS
        <http://hhhhhhhhh/mapserv/wt?service=WMS>"
            "wms_srs"       "epsg:9823 epsg:4326 epsg:54004"
          END
        END

        PROJECTION
          "init=epsg:54004"
        END

        LAYER
          NAME k92_strandlinje
          DEBUG ON
          METADATA
            "wms_title"    "k92_strandlinje"
            "wms_srs"    "EPSG:4326"
          END
          TYPE POLYGON
          STATUS ON
          CONNECTIONTYPE postgis
          CONNECTION "user=postgres password=xxx dbname=xxx host=localhost"
          DATA 'the_geom from k92_strandlin_polygon'
          PROJECTION
           "init=epsg:4326"
          END
          CLASS
            NAME "strandlin-pgx"
            COLOR 255 251 237
            OUTLINECOLOR 100 100 100
          END
        END

        END


        /Regards Bengt



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