[gdal-dev] Gdal pdf driver and ogr_datasource with automatic -spat

[Jukka Rahkonen]

Hi,

Could it be possible to make GDAL PDF driver (http://gdal.org/frmt_pdf.html)
to apply automatically -spat filter for the OGR_DATASOURCE layers which 
are to be drawn on top of raster layers? The values for the filter could
be captured from the raster layer extents.

Now by default all the features from the vector layer are inserted into
the PDF document. The features which lie outside the map borders on 
the map are rather unusable for users because it is impossible to 
show the features on a map even it is possible to select the features
from the list and show the attributes. However, I suppose that usually 
people suppose that the map and feature list suit together.

I can imagine that there could be some troubles in automatic construction
of -spat filter if the PDF targer srs is different than the native srs of
OGR_DATASOURCE.

-Jukka Rahkonen-