Hi there, I have been experimenting with Gdal 2.2-dev as of generating GeoPdf files. All of what I have been trying out seems to be working just fine:
- Stacking of multiple raster-layers - Stacking of multiple vector-layers (with attribute-info) Though, I have some comments/objections: When generating a PDF one would expect that it should be possible to control the actual size (in paper-units) of the actually produced PDF. This will allow for one to do "Print In Actual Size" from Adobe Acrobat Reader yielding a true-scale print (say 1:500). It would also be nice, if a preferred paper-unit could be specified up front (inch, cm, mm). This could allow for a more precise mappings to A-formats (which I believe are inherent in PDF). Currently (as of GDAL 2.2dev) the paper-unit-type is always "inch", and the actual size (internal properties of PDF) can only be controlled by letting the bottom-most raster layer presented to gdal_translate have a pixel-size corresponding exactly to the user-unit size (1/72 inch) of the desired PDF paper-size. I suggest, that gdal_translate should treat a DPI-setting literally: The DPI setting should apply to the bottom raster-layer. All other raster/vector layers are to be mapped to that "media-box". As of WRITE_USERUNIT it is only to provide for a mean to "scale" the resolution. It should be a scale value, to be applied to the default USER_UNIT value of PDF (1/72 inch). Regards, Aron
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