[poppler] Fwd: [gdal-dev] turn off Orthoimage layer for USGS topos

[Albert Astals Cid]

If you guys have a need for what it seems is quite an obscure feature i'd say 
you're better off implementing it yourselves, we have quite a few of much more 
common use cases missing.

Cheers,
  Albert

El Dilluns, 27 d'octubre de 2014, a les 08:40:45, Newcomb, Doug va escriure:
> The USGS distributes USGS 7.5 minute topographic  map data as geopdfs only
>  these days,  http://store.usgs.gov/locator/about_digital_maps.html.  There
> are raster and vector elements within the pdf files.  It would be useful to
> be able to extract the raster and vector elements separately and convert
> the data layers into more standard geographic data formats.  Some of the
> geopdfs are not quite the same format as the rest.
> 
>  I forwarded the email from the gdal list to the poppler list because I
> thought the topic might be of interest to the poppler list and the poppler
> developers might be more familiar with the details of the pdf format and
> may be able to provide insight.
> 
> Doug
> 
> On Sun, Oct 26, 2014 at 1:36 PM, Albert Astals Cid <aacid at kde.org> wrote:
> > El Dimecres, 24 de setembre de 2014, a les 09:00:09, Newcomb, Doug va
> > 
> > escriure:
> > > Just FYI , Poppler is being used with GDAL, http://www.gdal.org to work
> > > with geopdf data.  There are a few pdfs with issues, however
> > 
> > Not sure that's the intention of this forward. Can you be more verbose?
> > 
> > Cheers,
> > 
> >   Albert
> >   
> > > .
> > > 
> > > Doug
> > > ---------- Forwarded message ----------
> > > From: Even Rouault <even.rouault at spatialys.com>
> > > Date: Wed, Sep 24, 2014 at 6:23 AM
> > > Subject: Re: [gdal-dev] turn off Orthoimage layer for USGS topos
> > > To: gdal-dev at lists.osgeo.org
> > > 
> > > 
> > > Jian,
> > > 
> > > I've analyzed the file and it has indeed a particular structure with its
> > > OptionalContentGroup and OptionalContentMembershipDirectionary, the PDF
> > > objects that define layers and their visibility rules. Would be
> > 
> > difficult to
> > 
> > > explain here... I believe the file is correct (at least layer turning
> > > on/off works well in Acrobat), but it seems that poppler (the PDF
> > > library
> > > used for PDF rendering) isn't ready yet to deal with that structure. It
> > > might be fixable
> > > in poppler and could perhaps be workarounded in GDAL code too.
> > > 
> > > Best regards,
> > > 
> > > Even
> > > 
> > > > Hello list,
> > > > 
> > > > I am just wondering if anybody has any experience with this-
> > > > 
> > > > I want to convert USGS Topos to Geotiff using GDAL. My command below
> > 
> > seems
> > 
> > > > to work well in general:
> > > > 
> > > > gdalwarp C:\JIANTestFolder\geo.pdf C:\JIANTestFolder\geo.tif
> > > > -crop_to_cutline -cutline C:\JIANTestFolder\cutline.csv -overwrite
> > > > --config GDAL_CACHEMAX 500 -wm 500 --config GDAL_PDF_LAYERS "ALL"
> > 
> > --config
> > 
> > > > GDAL_PDF_LAYERS_OFF Images.Orthoimage --config GDAL_PDF_DPI 250 -co
> > > > "TILED=YES" -co "TFW=YES" -co "COMPRESS=JPEG" -co "PHOTOMETRIC=YCBCR"
> > > > 
> > > > Except for some files:
> > > > WI_Madison_West_20100723_TM_geo.pdf
> > > > (http://ims.er.usgs.gov/gda_services/download?item_id=5222418)
> > > > IL_Metropolis_20101018_TM_geo.pdf
> > > > LA_Union_Springs_20100930_TM_geo.pdf
> > > > ND_Lehr_20110324_TM_geo.pdf
> > > > TX_Panola_20100312_TM_geo.pdf
> > > > .......
> > > > ......
> > > > 
> > > > 
> > > > For some reason, the Orthoimage layer cannot be turned off for these
> > > 
> > > files.
> > > 
> > > > I've noticed these might be the early versions of the new generation
> > 
> > USGS
> > 
> > > > topos (for example, the 2013 Madison one works well with the command).
> > 
> > > > Also I found people with similar issue here:
> > http://gis.stackexchange.com/questions/88988/gdal-conversion-of-us-topo-ge
> > 
> > > > opdfs
> > > > 
> > > > So I was wondering:
> > > > 
> > > > 1.       Why this is happening? "Bad" file format in the earlier
> > 
> > versions?
> > 
> > > > 2.        For these files, separating orthoimage from others is not
> > 
> > doable
> > 
> > > > at all or there might be other workaround?
> > > > 
> > > > Thank you in advance for any insight you want to share. I much
> > 
> > appreciate
> > 
> > > > any suggestions/comments.
> > > > 
> > > > Best regards,
> > > > Jian Liu
> > > 
> > > --
> > > Spatialys - Geospatial professional services
> > > http://www.spatialys.com
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