Historical U.S.G.S. Georeferencing


I have downloaded a historical USGS map that is suppose to be a geoPDF. My understanding is that QGIS cannot directly read geoPDF’s. I have not had any luck in converting it to a geoTIF in order to bring into QGIS.

  1. Has anyone had any success in doing this? Is there another way that
    someone knows to use the geoPDF with QGIS.

  2. I converted the geoPDF to a TIF and attempted to use the
    georeferencer plug-in. Everytime I try doing it te results are not
    correct.Georeferender screenshot Georeferencer result

Cropping and transforming geoPDF with GDALwarp


I got some great advice on how to transform a geoPDF to a geoTIF on this post, which used the available downloads from this site. I would like to take it a little further and not only convert, but remove the border of historical USGS maps in order to be able to tile them in QGIS. Being a basic GIS user, I get lost in the “coding” involved to implement these practices.

How can I convert and crop historical USGS maps so they can be tiled in QGIS?

Thank you in advance for the insight.

How do I remove the orthoimage layer from the new USGS geospatial PDF topo maps


I would like to remove the orthoimage layer from a USGS topo geoPDF map. I have Adobe Acrobat Pro 9, but can’t find a way to delete a layer. I’ve tried setting the layer to “Never export”, then exporting the pdf, but the image is still there (and in the process I have somehow deleted the geo-referencing info.)

Thanks

QGIS – Export PDF map with georeferenced data [duplicate]


This question already has an answer here:

GeoPDF Support in GDAL


I installed OSGeo4W using a Windows installer… it contains GDAL 1.7.3. I can’t get GDAL to recognize PDF as a file type using commands in MSYS shell. Does this version of GDAL not support PDFs? If not, what do I need to do to add support to PDFs for GDAL?

Is it possible to georeference an existing, un-georeferenced pdf?


I was wondering if there was anyway to georeference a pdf directly without first converting it to an image. I have access to ArcGIS 10.1 but haven’t been able to find any information that would indicate it is possible. I am willing to try other open source software if they have a solution.

Thanks!

Edit: I receive site plans in PDF form, often generated from AutoCAD. Currently I save the pdf as a jpg to import into ArcMap, geo-reference it and then digitize things like building footprints. I’m just wondering if there is a way to skip the conversion to jpg step.

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