[gdal-dev] problem: gdal_grid, output ers raster file

[Ron Palmer]

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.palmer at pgcgroup.com.au

www.pgcgroup.com.au <URL:www.pgcgroup.com.au>

*/PGC Geophysics - We specialise in Electrical Surveys!/*



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