<div dir="ltr"><div><div><div><div><div>Hi Gavin and Walter,<br><br></div>Sorry for my late response. I got caught in meetings and only managed to try out your suggestions late on friday and this morning.<br><br></div>I tried both ways and they both work well. Walter's suggestion of downloading the SRTM 30m DEMs is the faster method because I can download the images as geotiffs and load them in directly without Grass or any other manipulation. However I have learnt a lot from trying Gavin's method too.<br><br></div>Thank you both for your invaluable assistance. This discussion group is very valuable tool.<br><br></div>Regards,<br></div>Melissa<br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-04-24 13:50 GMT+02:00 Jean Paul Ngalams <span dir="ltr"><<a href="mailto:jpngalams@gmail.com" target="_blank">jpngalams@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thank you Gavin for your answer to Melissa's question; I had the same preoccupation. </div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Fri, Apr 24, 2015 at 12:17 PM, Gavin Fleming <span dir="ltr"><<a href="mailto:gavin@kartoza.com" target="_blank">gavin@kartoza.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Hi Melissa<br>
<br>
I've just done one of the NGI ort files (2631AA07.ort) in GRASS
(result below). Pretty much everything you need is at
<a href="http://grasswiki.osgeo.org/wiki/Import_XYZ" target="_blank">http://grasswiki.osgeo.org/wiki/Import_XYZ</a>. 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. <br>
<br>
<img src="cid:part1.07080809.02000308@kartoza.com" alt=""><br>
<br>
You should be able to import directly in QGIS (which uses GDAL)
after re-ordering the data as per
<a href="http://www.gdal.org/frmt_xyz.html" target="_blank">http://www.gdal.org/frmt_xyz.html</a>. 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. <br>
<br>
Good luck and let us know when you've done it (and how you did
it).<br>
<br>
Gavin<div><div><br>
<br>
On 24/04/2015 11:09, Melissa Akoue Mve wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div>
<div>Hi All,</div>
<div> </div>
<div>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.
</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>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,</div>
<div> </div>
<div>Kind Regards,</div>
<div>Melissa Akoue Mve,</div>
<div> </div>
<div> </div>
<div> </div>
<br>
<fieldset></fieldset>
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