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

[Jean Paul Ngalams]

Thank you Gavin for your answer to Melissa's question; I had the same
preoccupation.

On Fri, Apr 24, 2015 at 12:17 PM, Gavin Fleming <gavin at kartoza.com> wrote:

>  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,
>
>
>
>
>
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>
>
> --
>
> ------------------------------------------------------------------------------------------
>  Gavin Fleming Joint MD PrGISc [PGP1234]
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-- 
Jean Paul NGALAMULUME TSH.
Contact:+243 9 97 53 47 59
               ngalamjp at yahoo.fr
               Skype:jp.ngalams
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