[OSGeo Africa] How to load .ort DEM into QGIS

[Gavin Fleming]

Hi Melissa

I've just done one of the NGI ort files (2631AA07.ort) in GRASS (result
below). Pretty much everything you need is at
http://grasswiki.osgeo.org/wiki/Import_XYZ. Note there are multiple
spaces so you'll have to use the trick on that page to collapse multiple
spaces to single spaces. Also note the coordinates are south facing TM
so you'll have to do one zone at a time then project them together, or
project all to UTM or Albers first.



You should be able to import directly in QGIS (which uses GDAL) after
re-ordering the data as per http://www.gdal.org/frmt_xyz.html. However
on this one I tried, GDAL thinks the number of lines doesn't match the
size of the grid it has calculated so it fails., so I just switched to
GRASS.

Good luck and let us know when you've done it (and how you did it).

Gavin

On 24/04/2015 11:09, Melissa Akoue Mve wrote:
> Hi All,
>  
> I need to do a slope analysis of the whole Western Cape area.   I had
> planned to do this with the raster tool set in QGIS but after getting
> the DEM's from the NGI I discovered their DEMs are in a .ort format
> which is not a standard GDal format.  
>  
> I was informed that the only way to load this .ort into QGIS is by
> converting it to a CSV and then loading the CSV file into QGIS, and
> then converting it to raster when in DEM.   I have tried this but it
> is laborious and will take too long because there are more than 50 NGI
> DEMs that make up the Western Cape area.
>  
> Does anyone know of a simpler way to load the .ort file.   I have
> searched for ways to convert the .ort to a geotiff but I havent been
> successful yet,
>  
> Kind Regards,
> Melissa Akoue Mve,
>  
>  
>  
>
>
> _______________________________________________
> Africa mailing list
> Africa at lists.osgeo.org
> You can UNSUBSCRIBE at http://lists.osgeo.org/mailman/listinfo/africa


-- 
------------------------------------------------------------------------------------------
Gavin Fleming Joint MD PrGISc [PGP1234]
Visit http://kartoza.com <http://kartoza.com/>to find out about open source:
* Desktop GIS programming services
* Geospatial web development
* GIS Training
* Consulting Services
Skype: phlemingo
-------------------------------------------------------------------------------------------
Kartoza = Linfiniti ∪ Afrispatial
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/africa/attachments/20150424/dd4b098d/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: gedgiihb.png
Type: image/png
Size: 114232 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/africa/attachments/20150424/dd4b098d/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: KartozaWebBanner.png
Type: image/png
Size: 22131 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/africa/attachments/20150424/dd4b098d/attachment-0003.png>