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<p>Hi,</p>
<p>This is a "well known" behaviour of gdal_grid in which it writes
raster with a bottom-left corner origin, whereas most other GDAL
utilities use a top-left corner origin. The ERS driver doesn't
support such convention. The workaround you can use is to output
gdal_grid as a TIFF (tmp.tif), then use "gdalwarp tmp.tif out.ers"
to flip the origin to a top-left one.<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 03/03/2021 à 22:55, Ron Palmer a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:b9cfc764-6bc2-98a9-2fac-a9290edf78b4@pgcgroup.com.au">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Looks to me like the ERMapper ERS driver has a bug, using the
bottom left corner to georef the raster, instead of top left. I
can only use it if I use local coordinates, any negative
northings are plotted towards the north. ERS is the main raster
format I use.</p>
<p>I am happy to assist in sorting out the ERS format if the
person behind it is willing to have a look at it.<br>
</p>
<p>Thanks,</p>
<p>Ron<br>
</p>
<div class="moz-cite-prefix">On 17/02/2021 4:55 pm, Ron Palmer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1e6573b4-e303-7b20-3cac-e1681c6ea6f6@pgcgroup.com.au">
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<p>I am having issues with outputting ers raster file from
gdal_grid. I import a csv as shape, then grid it and output as
ers. The Y coords are all negative as it is in fact a section
I simply grid as a 2D raster. Although the shape file plots as
I expect it, the ers is flipped upside-down, and hung at the
lowest Y value. Please note, if I use GS7BG it works fine.<br>
</p>
<p>How do I get an ERS output that matches the shape file/data
points?</p>
<p>I have created a simple example... however, I am new to GDAL,
and this is my first post, so please let me know if there is
anything else I should provide.</p>
<p>Thanks</p>
<p>Ron<br>
</p>
<p><br>
</p>
<p>These are the commands:</p>
<p> 711 ogr2ogr -f "ESRI Shapefile" xc_zc.shp new.csv -oo
X_POSSIBLE_NAMES=xc -oo Y_POSSIBLE_NAMES=zc<br>
712 gdal_grid -zfield Value -a linear:radius=5 xc_zc.shp
-of ERS xc_zc.ers<br>
</p>
<p>here is the content of the data</p>
<p>xc,zc,Value<br>
1.25,-0.625,5<br>
3.75,-0.625,5<br>
6.25,-0.625,5<br>
8.75,-0.625,5<br>
11.25,-0.625,5<br>
1.25,-1.938,4<br>
3.75,-1.938,4<br>
6.25,-1.938,4<br>
8.75,-1.938,4<br>
11.25,-1.938,4<br>
1.25,-3.381,3<br>
3.75,-3.381,3<br>
6.25,-3.381,3<br>
8.75,-3.381,3<br>
11.25,-3.381,3<br>
1.25,-4.969,2<br>
3.75,-4.969,2<br>
6.25,-4.969,2<br>
8.75,-4.969,2<br>
11.25,-4.969,2<br>
1.25,-6.716,1<br>
3.75,-6.716,1<br>
6.25,-6.716,1<br>
8.75,-6.716,1<br>
11.25,-6.716,1<br>
</p>
<p>I have attached a jpg of my output (not sure whether the
mailing list allows attachments...)<br>
</p>
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