Hmmm. My PDF doesn't seem to have a neatline, only a MediaBox and two
BBoxes...
Brent
On 10/20/2010 9:04 AM, Even Rouault wrote:
You don't need to convince anyone to add new functionnality. It already exists
;-)
See the -cutline option of gdalwarp. Basically you use the NEATLINE reported by
gdalinfo as the CUTLINE (that was the sole purpose of reporting the NEATLINE by
the way !)
The easiest way is to make a simple CSV like this :
foo,WKT
bla,"POLYGON((....))"
and you paste the content of NEATLINE as the value of the WKT.
and do a gdalwarp without reprojecting to crop (use -crop_to_cutline) to the
neatline. Then you can do a 2nd gdalwarp to reproject to the target SRS.
(if you want to do just one gdalwarp, you'll have to do ogr2ogr to reproject the
cutline.csv into the target SRS)
See http://gdal.org/gdalwarp.html and/or
http://gdal.org/structGDALWarpOptions.html#0ed77f9917bb96c7a9aabd73d4d06e08
Boris,
Use gdalwarp to convert your jpeg to Geographic coordinates (I think
it needs to be converted for KML anyways):
gdalwarp -t_srs EPSG:4326 in.jpg out.jpg
then use gdalinfo to get the corner coordinates.
Currently the entire page of the PDF is rendered into the image.
Perhaps we can convince Even to add an option to convert only the mapped
area (or mask everything else?)
Best Regards,
Brent Fraser
On 10/20/2010 8:07 AM, Boris Dev wrote:
My objective is to make a KML ground overlay with a geospatial PDF map.
Using GDAL's translate utility I have converted the PDF to a JPEG. The
next step and problem for me is to write the text of the KML ground
overlay, which requires a text of bounding box information like this:
<LatLonBox>
<north>37.91904192681665</north>
<south>37.46543388598137</south>
<east>15.35832653742206</east>
<west>14.60128369746704</west>
<rotation>-0.1556640799496235</rotation>
</LatLonBox>
As GDAL's output, I saw that the entire PDF with legend, title, etc
and not just the map image was converted.
As GDAL's output, I also saw 2 parts of data that seem they are useful
to match a bounding box to the map within the jpeg, but I cant figure
out the puzzle of how to make this work? Can I get the bounding box of
the entire PDF image with this information below?
Corner Coordinates:
Upper Left ( 666937.758, 2024687.983)
Lower Left ( 666991.811, 2018338.153)
Upper Right ( 674511.276, 2024754.795)
Lower Right ( 674565.328, 2018404.965)
Center ( 670751.543, 2021546.474)
<MDI key="NEATLINE">POLYGON ((672676.488065659650601
2019417.955749646294862,672636.091432046378031
2024030.267778463661671,667347.405745737953112
2023983.612156898481771,667385.539170471020043
2019370.524140953086317,672676.488065659650601
2019417.955749646294862,672676.488065659650601
2019417.955749646294862,672676.488065659650601
2019417.955749646294862,672676.488065659650601
2019417.955749646294862))</MDI>
I realize the coordinate above need to be converted to lat/long to be
a KML ground overlay onto Google Maps, which I think I can handle.
But I am unsure if I need to extract the map image from the jpeg using
the NEATLINE?
How are the Corner Coordinates translated into a bounding box?
Any suggestions?
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