[gdal-dev] gdal_rasterize update access mode for EHdr/Bil file

[Even Rouault]

Le samedi 28 janvier 2012 00:55:32, lucvanlinden a écrit :
> Hi
> 
> I successfully created an EHdr / Bil file using gdal_grid 400 by 400 pixels
> with 1 band from a series of preprocessed 3D vertices/points read from
> Postgis.
> 
> In a second stage I would like to add 3D polygons to that same bil file
> using gdal_rasterize.
> These source polygons are in the same SRS and in the same postgis database.
> 
> >From reading the documentation this should be feasible using
> >gdal_rasterize.
> 
> However it seems not be able to update this bil file, as the gdal_rasterize
> returns:
> 
> '-tr xres yes' or '-ts xsize ysize' is required
> 
> Here is the gdal_rasterize command:
> 
> gdal_rasterize -3d -l test_3d  -a_srs EPSG:31370 -ot Int32 -of EHdr
> PG:"dbname='postgis' host='localhost' port='5432' user='postgres'
> password='postgis' tables=test_3d"  target.bil

Try removing the -a_srs, -ot and -of options : when gdal_rasterize sees one of 
those, it assumes you want to create a new file. 

EHdr supports updating. If you issue a "gdalinfo --format ehdr" , you will see 
"Supports: Create() - Create writeable dataset.". This also imply update 
support.