Gotcha. Thanks for both pieces of info.
On Thu, Aug 15, 2013 at 9:33 AM, Even Rouault <[email protected]>wrote: > Le jeudi 15 août 2013 15:25:47, Reaves, Timothy a écrit : > > I'm converting some GeoPDF files to TIFF. I want to crop, and I need to > > re-project. I can do one or the other, but, when I combine them, all I > get > > is a black output. > > > > The base command is: > > gdalwarp -multi -co "TILED=YES" infile.pdf outfile.tiff --config > > GDAL_PDF_LAYERS_OFF "Map_Collar","Map_Frame.Projection_and_Grids" > > > > Then, I use either: > > -crop_to_cutline -cutline cutline.csv -overwrite > > or > > -t_srs EPSG:3785 > > > > Either of these works. Just not both. Are the two options mutually > > exclusive? > > Thimothy, > > According to the gdalwarp manual : "If the OGR layer containing the > cutline features has no explicit SRS, the cutline features must be in the > georeferenced units of the destination file.". > > CSV have no explicit SRS, so to use -t_srs EPSG:3785, the CSV must be > itself > in EPSG:3785 > > So you could do a preprocessing step : > > ogr2ogr -s_srs EPSG:XXXX -t_srs EPSG:3785 cutline_3785.csv cutline.csv > > where XXXX is the EPSG code of the GeoPDF > > And then use cutline_3785.csv as the value of the -cutline parameter of > gdalwarp. > > > > > As an aside, when cropping, how do I make the area outside of the image > > transparent instead of black? > > Try adding -dstalpha to your gdalwarp command line. > > Even > > -- > Geospatial professional services > http://even.rouault.free.fr/services.html >
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