Comments (3)
jratike80
commented on July 17, 2024
If you use ogr2ogr you are playing with vector data, not pixels. You can check the extent of the PDF with ogrinfo
ogrinfo --config OGR_PDF_READ_NON_STRUCTURED YES clipsrc-problem.pdf -al -so
Extent: (-51.548640, -14146.138422) - (54006.879028, 28800.419032)
I thought that this would return the same output than without clipsrc
-clipsrc -51.548640 -14146.138422 54006.879028 28800.419032
However, it does not. There is something in the extents that I do not understand. Ogrinfo shows these extents:
For the pdf:
Feature Count: 63161
Extent: (-51.548640, -14146.138422) - (54006.879028, 28800.419032)
For the without-clipsrc
Feature Count: 63161
Extent: (-90.717000, -24895.827000) - (95042.892000, 50685.936000)
For the with-clipsrc
Feature Count: 16590
Extent: (2345.217000, 225.514000) - (54006.879000, 28800.419000)
Gdalinfo works in a rasterized world but it finds also different size for the document than what you calculated:
gdalinfo clipsrc-problem.pdf
Driver: PDF/Geospatial PDF
Files: clipsrc-problem.pdf
Size is 5392, 2878
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rouault
commented on July 17, 2024
I don't reproduce the issue using GDAL master. The geojson files generated with or without clipsrc are of similar size (the clipped one is slightly smaller due to some invalid geometries, like lines reduced to one single point, being omitted), and they look identical (except the "frame" line of the unclipped file being removed, as expected) when opened in QGIS
$ ls -al without-clipsrc.geojson with-clipsrc.geojson
-rw-rw-r-- 1 even even 15017544 juin 29 17:53 with-clipsrc.geojson
-rw-rw-r-- 1 even even 16653048 juin 29 17:52 without-clipsrc.geojson
$ ogrinfo -al -so without-clipsrc.geojson
INFO: Open of `without-clipsrc.geojson'
using driver `GeoJSON' successful.
Layer name: content
Geometry: Unknown (any)
Feature Count: 63161
Extent: (-9.072000, -2489.583000) - (9504.289000, 5068.594000)
$ ogrinfo -al -so with-clipsrc.geojson
INFO: Open of `with-clipsrc.geojson'
using driver `GeoJSON' successful.
Layer name: content
Geometry: Unknown (any)
Feature Count: 53658
Extent: (234.522000, 21.891000) - (9482.474000, 5032.952000)
I believe that the fixes for the PDF driver that went in 3.9.1 to solve #9870, in particular 53895c7, were the key to fix the issue.
With 3.8, you can workaround the issue (for that particular file) by multiplying by 10 your -clipsrc values
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tiffanywei
commented on July 17, 2024
@rouault Upgrading gdal fixed it, thank you!
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