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.
I am happy to assist in sorting out the ERS format if the person behind
it is willing to have a look at it.
Thanks,
Ron
On 17/02/2021 4:55 pm, Ron Palmer wrote:
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.
How do I get an ERS output that matches the shape file/data points?
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.
Thanks
Ron
These are the commands:
711 ogr2ogr -f "ESRI Shapefile" xc_zc.shp new.csv -oo
X_POSSIBLE_NAMES=xc -oo Y_POSSIBLE_NAMES=zc
712 gdal_grid -zfield Value -a linear:radius=5 xc_zc.shp -of ERS
xc_zc.ers
here is the content of the data
xc,zc,Value
1.25,-0.625,5
3.75,-0.625,5
6.25,-0.625,5
8.75,-0.625,5
11.25,-0.625,5
1.25,-1.938,4
3.75,-1.938,4
6.25,-1.938,4
8.75,-1.938,4
11.25,-1.938,4
1.25,-3.381,3
3.75,-3.381,3
6.25,-3.381,3
8.75,-3.381,3
11.25,-3.381,3
1.25,-4.969,2
3.75,-4.969,2
6.25,-4.969,2
8.75,-4.969,2
11.25,-4.969,2
1.25,-6.716,1
3.75,-6.716,1
6.25,-6.716,1
8.75,-6.716,1
11.25,-6.716,1
I have attached a jpg of my output (not sure whether the mailing list
allows attachments...)
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*Ron Palmer*MSc MBA
Principal Geophysicist
0413 579 099 ron.pal...@pgcgroup.com.au
www.pgcgroup.com.au <URL:www.pgcgroup.com.au>
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