[Qgis-user] Help make Lisbon hackfest a success

[Paolo Cavallini]

Hi all.
Our next developer meeting is approaching:
http://www.qgis.org/wiki/5._QGIS_Hackfest_in_Lisbon_2011
26 participants, including most core developers, are expected to join.
During the meeting we'll discuss about future improvements of QGIS,
we'll squash many bugs, and hopefully we'll release version 1.7, another
major step forward. Even if you cannot participate in flesh, your help
is important. You are invited to be on the IRC channel, to participate
to discussions, to help tidying up the bug queue, etc.
It is not too late also to help financially: your donations will make
life easier and more pleasant for developers, by paying for their food
and drinks, traveling and lodging. Remember, we are all donating our
time, please do your part.
All the best.
-- 
http://www.faunalia.it/pc

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Re: [Qgis-user] Rule renders and colour ramps

[Martin Dobias]

Hi Ramon

On Sat, Apr 9, 2011 at 1:51 AM, Ramon Andinach  wrote:
> On a related thought to the recent questions about rule renders. Mostly I'm 
> using the rules to define colour schemes that I can't work out how to get 
> otherwise.
>
> Is there a way to define custom colour ramps?
> Particularly I'm thinking of colour brewer ramps.
> If there is, could someone point me in the right direction?

Yes it is possible to define custom color ramps: either in Style
manager dialog (menu Options -> Style manager) or when selecting a
color ramp for categorized/graduated renderer, the last item in the
combo box is "new color ramp". There is a support for gradients,
random colors and colorbrewer ramps.

Btw. you are doing a great job with the "how do I do" pages on the wiki!

Regards
Martin
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[Qgis-user] print composer error?

[Kosza Antal]

Hi,

Any idea, why a narrow band appears after saving/exporting from print
composer? 

http://www.flickr.com/photos/61556126@N07/5602729271/
http://www.flickr.com/photos/61556126@N07/5602729269/



-- 
Kosza Antal 


signature.asc
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Re: [Qgis-user] print composer error?

[Marco Hugentobler]

Hi Kosza

Could it be that the raster map is transparent? QGIS tries to draw the raster 
in several pieces with a certain overlap (to save memory). Therefore the band 
appears only in the output with higher resolution than screen.

Probably it would be good to have (in future) the option to draw the rasters 
in one tile.

Regards,
Marco

Am Samstag, 9. April 2011, 16.44:17 schrieb Kosza Antal:
> Hi,
> 
> Any idea, why a narrow band appears after saving/exporting from print
> composer?
> 
> http://www.flickr.com/photos/61556126@N07/5602729271/
> http://www.flickr.com/photos/61556126@N07/5602729269/


-- 
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Churerstr. 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentob...@sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
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Re: [Qgis-user] OSM data download

[Micha Silver]

On 04/08/2011 06:38 PM, Richard Duivenvoorde wrote:


subbu sravan wrote:

Good afternoon everyone,
 I am  creating data bank for
Dindigul (Tamilnadu) on OSM so that i can  download the data through OSM
plugin in qgis.The geographical extensions of my Study area are 10° 22'
   11° 25'  latitude
   78° 00'  76° 46' longitude
When try to download the data of these extensions Qgis won't except the
extensions. If some body knows how download the my study area data
please help me


Hi Subbu,

I don't think this is qgis related.
The plugin just uses other tools to download data from osm-api server.

If I convert your bounding box to decimal degrees:

78.7667 11.4167 10.3667 78.00

I get the following message from the plugin:

Download failed: Download process failed. OpenStreetMap server response:
Bad Request - The maximum bbox size is 0.25, and your request was too
large. Either request a smaller area, or use planet.osm.

It's just that the OSM server does not want to provide al this data via
the osm-api

You can either get small boxes of 0.25x0.25 degrees but it is easier te
get a data set from mirrors like:

http://download.geofabrik.de/osm/asia/

there are a lot of other mirrors for that:
http://wiki.openstreetmap.org/wiki/Planet.osm#Mirrors



Additionally, you can directly download areas larger than 0.5X0.5 
degrees from the xapi interface, explained here:

http://wiki.openstreetmap.org/wiki/Downloading_data#Construct_a_URL_for_the_HTTP_API


Regards

Richard Duivenvoorde
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--
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il


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[Qgis-user] Dissolve a shapefile in qgis

[Manuel Spínola]

Dear qgis users,

I am trying to use the dissolve function of the ftools to "merge" 3 polygons
of a shapefile but qgis get stuck on the 66% of the "status bar".

Any idea why I cannot dissolve the shapefile?

Thank you very much in advance.

Best,

Manuel



-- 
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspin...@una.ac.cr
mspinol...@gmail.com
Teléfono: (506) 2277-3598
Fax: (506) 2237-7036
Personal website: Lobito de río 
Institutional website: ICOMVIS 
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Re: [Qgis-user] Rule renders and colour ramps

[Ramon Andinach]

On 09/04/2011, at 20:20 , Martin Dobias wrote:

> Hi Ramon
> 
> On Sat, Apr 9, 2011 at 1:51 AM, Ramon Andinach  wrote:
>> On a related thought to the recent questions about rule renders. Mostly I'm 
>> using the rules to define colour schemes that I can't work out how to get 
>> otherwise.
>> 
>> Is there a way to define custom colour ramps?
>> Particularly I'm thinking of colour brewer ramps.
>> If there is, could someone point me in the right direction?
> 
> Yes it is possible to define custom color ramps: either in Style
> manager dialog (menu Options -> Style manager) or when selecting a
> color ramp for categorized/graduated renderer, the last item in the
> combo box is "new color ramp". There is a support for gradients,
> random colors and colorbrewer ramps.

Thanks for that. 
If I see properly, for colour brewers, I get to choose a colour pattern suite, 
how many colours are there and that's about it.
Now, what happens if I was looking for something that was approximately like 
the Spectrum colourbrewer, but with the colours backwards (blues low, reds 
high) (or even define whole new colour suites).
Is that possible?

> Btw. you are doing a great job with the "how do I do" pages on the wiki!

Thanks Martin, the encouragement is much appreciated.

-ramon.___
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Re: [Qgis-user] print composer error?

[John C. Tull]

Hi all,

I reported this as a bug last month. 

http://trac.osgeo.org/qgis/ticket/3640

Regards,
John

On Apr 9, 2011, at 8:12 AM, Marco Hugentobler wrote:

> Hi Kosza
> 
> Could it be that the raster map is transparent? QGIS tries to draw the raster 
> in several pieces with a certain overlap (to save memory). Therefore the band 
> appears only in the output with higher resolution than screen.
> 
> Probably it would be good to have (in future) the option to draw the rasters 
> in one tile.
> 
> Regards,
> Marco
> 
> Am Samstag, 9. April 2011, 16.44:17 schrieb Kosza Antal:
>> Hi,
>> 
>> Any idea, why a narrow band appears after saving/exporting from print
>> composer?
>> 
>> http://www.flickr.com/photos/61556126@N07/5602729271/
>> http://www.flickr.com/photos/61556126@N07/5602729269/
> 
> 
> -- 
> Dr. Marco Hugentobler
> Sourcepole - Linux & Open Source Solutions
> Churerstr. 22, CH-8808 Pfäffikon SZ, Switzerland
> marco.hugentob...@sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
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[Qgis-user] Re: Inconsistent projection parameters for EPSG:3168

[Hilmy Hashim]

The wrong value for the false_easting for the RSO projection has been
confirmed as a bug in GeoTiff: http://trac.osgeo.org/geotiff/ticket/38

*Hilmy*


On Thu, Apr 7, 2011 at 5:04 PM, Hilmy Hashim  wrote:

> I am using QGIS 1.7.0 dev version (now at revision 15677) from the OSGeo4W
> suite on a Windows 7 64-bit machine.
>
> The proj4 string for EPSG:3168 Kertau (RSO) / RSO Malaya (m) from
> Settings->Project Properties is as follows:
>
> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257905 +k=0.99984
> +x_0=804670.24 +y_0=0 +a=6377295.664 +b=6356094.667915204 +units=m +no_defs
>
> Note in particular:
> +alpha=323.0257905 (azimuth)
> +x_0=804670.24 (false easting)
> +gamma (rectified grid angle)  is not defined
>
> I assigned an SRS for a GeoTIFF raster using GdalTools Translate (Convert
> format), essentially  doing a gdal_translate -a_srs EPSG:3168.
>
> Using GdalTools->Information (gdalinfo) I get this SRS definition:
>
> Driver: GTiff/GeoTIFF
> ...
> Coordinate System is:
> PROJCS["Kertau (RSO) / RSO Malaya (m)",
> GEOGCS["Kertau (RSO)",
> DATUM["Kertau_RSO",
> SPHEROID["Everest 1830 (RSO
> 1969)",6377295.664,300.801700015,
> AUTHORITY["EPSG","7056"]],
> AUTHORITY["EPSG","6751"]],
> PRIMEM["Greenwich",0],
> UNIT["degree",0.0174532925199433],
> AUTHORITY["EPSG","4751"]],
> PROJECTION["Hotine_Oblique_Mercator"],
> PARAMETER["latitude_of_center",4],
> PARAMETER["longitude_of_center",102.25],
> PARAMETER["azimuth",323.0257905],
> PARAMETER["rectified_grid_angle",323.130102361],
> PARAMETER["scale_factor",0.99984],
> PARAMETER["false_easting",0],
> PARAMETER["false_northing",0],
> UNIT["metre",1,
> AUTHORITY["EPSG","9001"]],
> AUTHORITY["EPSG","3168"]]
> ...
>
> Notice that the "false easting" parameter is 0 instead of the correct value
> of 804670.24 as found in proj4. The azimuth value is correct and there is
> also a rectified_grid_angle value.
>
> Looking in OSGeo4W\share\epsg_csv\pcs.csv, I see the following values for
> 3168:
>
> PARAMETER_VALUE_1: 804670.24
> PARAMETER_VALUE_5: 323.01328458
> PARAMETER_VALUE_6: 323.07483685
>
> Now the false easting value is correct, while the azimuth and
> rectified_skew_angle are different.
>
> So where is Gdal in QGis getting it's parameters from?
>
>
>
> *Hilmy*
>
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[Qgis-user] error with r.cost

[ambijat]

Hi All,
I am trying to create shortest path between two raster points (converted 
from v.to.rast) and I use the STRM data for the input values between the 
two points. This is the error I get.


r.cost input=afg_rast@user1 output=salroute start_rast=salang@user1 
max_cost=0 -k


G_malloc: unable to allocate 524288 bytes at setup.c:64

Finished with error


Any idea why I am getting this?

Thanks and regards,

Ambrish Dhaka

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