[gdal-dev] Reading Layers In USGS Geospatial Topo Files:

[Mike Flannigan]

I don't do this much, so I'm not sure this still applies.
But here are my notes on the subject.  I am on Linux
now, so windows stuff is generally of no use to me.


Convert GeoPDF to GeoTiff:

Do this 1st:
gdal_translate 'Mount Rose.pdf' 'Mount Rose2.tif' -of GTiff

Do this 2nd:
gdal_translate 'Mount Rose2.tif' 'Mount Rose.tif' -b 1 -b 2 -b 3 -mask 4 
-co COMPRESS=JPEG -co PHOTOMETRIC=YCBCR --config GDAL_TIFF_INTERNAL_MASK YES

Works on Linux, but creates a HUGE file (~88 MG):
gdal_translate -of GTiff -co "COMPRESS=DEFLATE" --config GDAL_PDF_DPI 
300 /home/mike/Documents/copy2/fv.pdf /home/mike/Documents/copy2/fv-03.tif

Best one to use on Windows, but does not work on Linux:
C:\GDAL\bin\gdal\apps\gdal_translate -of GTiff C:\Copy\bm.pdf 
C:\Copy\bm.tif --config GDAL_PDF_DPI 300 -co "COMPRESS=JPEG" -co 
"JPEG_QUALITY=85"

It takes 2 minutes and 15 seconds to process a 10.1MB GeoPDF file.

Oddly on 10/1/2019 I had to copy all the DLL files from C:\GDAL\bin into 
C:\GDAL\bin\gdal\apps
to get this to work.

Another good one:
C:\Copy\bin\gdal\apps>gdal_translate -of GTiff C:\Copy\wp.pdf 
C:\Copy\wpt.tif --config GDAL_PDF_DPI 300


Don't use this:
C:\Copy\bin\gdal\apps>gdal_translate -of GTiff -co "TILED=YES" -co 
"TFW=YES" C:\
Copy\wp.pdf C:\Copy\wpt.tif --config GDAL_PDF_DPI 300

Don't use this:
C:\Copy\bin\gdal\apps>gdal_translate -of GTiff -co "TILED=YES" -co 
"TFW=YES" C:\Copy\wpt.tif --config GDAL_PDF_LAYERS_OFF 
"Map_Collar","Map_Frame.Projection_and_Grids" --config GDAL_PDF_DPI300


Mike
Houston, TX


On 3/25/25 16:03, gdal-dev-request at lists.osgeo.org wrote:
> Date: Tue, 25 Mar 2025 13:40:18 -0700
> From: Carl Carlson<cacarlson at alumni.stanford.edu>
> To:gdal-dev at lists.osgeo.org
> Subject: [gdal-dev] Reading Layers In USGS Geospatial Topo Files:
> Message-ID:<2AEBA991-A148-4B9D-A2AA-4F8A6FC94F1F at alumni.stanford.edu>
> Content-Type: text/plain; charset="utf-8"
>
> I have almost no experience with GDAL or python, butI do have  57 years
> programming experience.  I need some help with GDAL.  At 79 I don?t have
>   the time and energy to get deeply into these topics.  I need a quick
> solution
>
> I am writing a program to copy selected layers from a 7.5? USGS
> geospatial PDF Topo File and save them as geoTIFFs.  My efforts with
> gdalinfo,  gdal.Open, and gdal.Translate have led me nowhere worthwhile.
>    I can?t find the layers.  I just don?t know enough about this.
>
> Would some kind person help me out with sample code?
>
> Thanks

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