[OSGeo-Discuss] Call for help: GDAL and txt2shp.py

[Dane Springmeyer]

On Jul 3, 2008, at 1:40 PM, Kjell Are Refsvik wrote:

>
> On 3. juli. 2008, at 21.36, Dane Springmeyer wrote:
>
>> Refsvik,
>>
>> Try reversing your coordinates, as the graphic looks like your  
>> output shapefile has had the x/y reversed.
>
> Splendid! That did the trick.

great.

>
> However - I have another dataset from the middle east, and  
> approaching this data the same way, even trying to reverse the  
> dataset from the images, it still fails:
>
> http://www.ia-stud.hiof.no/~kjellare/misc/gdal_fail1.png
> http://www.ia-stud.hiof.no/~kjellare/misc/gdal_fail2.png
>

I can see from the Qgis mouse coordinates in the lower right that the  
shapefile you created likely has x,y coordinates in a projected  
coordinate system (at least different from WGS 84/4326). My first  
(wild) guess would be to add a .prj file from spatialreference.org for  
a UTM zone that covers your area of the middle east (you'll be need to  
find out what exact zone number is needed if it is in UTM).

I would try:

http://www.google.com/search?hl=en&q=site%3Ahttp%3A%2F%2Fspatialreference.org+utm+middle+east&btnG=Search

UTM is a likely candidate if the data came from a GPS unit, but its  
just a guess.

>

> ... trying to have the dots numbered or named and outputting the two  
> layers as a transverse mercator projected .png file are the two  
> things left to do.


> I would really appreciate some input on how to proceed, as I cannot  
> figure out if gdal_rasterize can be used for this purpose.
>

In Qgis you should be able to reproject to UTM and label your points.  
Qgis will also export to PNG format if that is what you want. However  
I don't think that Qgis will output an ESRI world file (the only way  
that I know to keep a PNG spatially reference... but the application  
uDIG will output a .wld world file to spatially reference a PNG).

I'd recommend #qgis or #udig with further questions.


Dane



>
> Best regards,
>
> Kjell Are
>
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