Ron
On 4/03/2021 8:11 am, Even Rouault wrote:
Hi,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.Even Le 03/03/2021 à 22:55, Ron Palmer a écrit :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.ershere 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,-6.716,1I have attached a jpg of my output (not sure whether the mailing list allows attachments...)<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient><#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>-- *Ron Palmer*MSc MBA Principal Geophysicist 0413 579 099 ron.pal...@pgcgroup.com.au www.pgcgroup.com.au <URL:www.pgcgroup.com.au> */PGC Geophysics - We specialise in Electrical Surveys!/* _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev-- http://www.spatialys.com
-- *Ron Palmer*MSc MBA Principal Geophysicist 0413 579 099 ron.pal...@pgcgroup.com.au www.pgcgroup.com.au <URL:www.pgcgroup.com.au> */PGC Geophysics - We specialise in Electrical Surveys!/* -- This email has been checked for viruses by AVG. https://www.avg.com
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