> it kind of reminds me of GDAL virtual > format (.vrt) as I think it uses the MEM driver under the hood.
Not really, but the inner working of the drivers isn't very important from the user point of view. > > So, essentially you are telling me I can create a MEM object and store my > image band information to the recently created GDALDatasetH object (I use > the C API) and to set PDF metadata via GDALSetMetadata(). Yes, and with GDALSetGeoTransform() and GDALSetProjectionRef() > Would that be > the direction I could go to use CreateCopy() for a valid Geospatial PDF > file? Yes > > I do have a few questions on PDF creation fields: > > 1. If a neatline is not provided, what gets populated in the neatline? the outline of the raster. > > 2. For EXTRA_CONTENT_STREAM and EXTRA_IMAGES, are we limited to one entry? (I've just realized that the doc was not up-to-date, correction committed, website should be refreshed in a few hours. The name of the option is EXTRA_STREAM) - EXTRA_STREAM : yes limited to one entry, but can be complex PDF language - EXTRA_IMAGES : as indicated in the doc, you can provide a list of images as the value > Is it each time we call GDALSetMetadata() is will append another entry > request? No, GDALSetMetadata() replaces the existing metadata with the whole list of key=value strings provided. But you cannot have several entries with the same key in the list. > > Correct me if I am wrong, but EXTRA_CONTENT_STREAM is associated by > EXTRA_IMAGES where EXTRA_IMAGES tells the PDF file where on the page to > display the EXTRA_CONTENT_STREAM data? No, the options are independant. EXTRA_STREAM is a very advanced one. You must study the PDF language from the specification or other sources to be able to use it. EXTRA_IMAGES is must simpler to use (but more limited). > My concern is how to add multiple entries of EXTRA_CONTENT_STREAM? I know > the content stream is described by its information and EXTRA_IMAGES and > EXTRA_CONTENT_LAYER_NAME. Already answered by above answers. The best if that you try it. You can also have a look at http://trac.osgeo.org/gdal/browser/trunk/autotest/gdrivers/pdf.py, and in particular pdf_custom_layout() _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
