It's slow and grinds qgis to a halt while it loads, but it does work. The different layers, which are independently controllable in Acrobat Reader are flattened when the topo is opened in Qgis, which rasterizes the image and presents it as one raster, not separate layers.
USGS has made these maps much less useful by adding the aerial imagery layer, at least for me. Qgis isn't the only application that flattens the layers, and the imagery obscures way to much for my taste.
On 4/21/2020 12:22 PM, Mike Flannigan wrote:
Much to my surprise I think you are correct.
QGIS can open a TIF file (and a zipped TIF file),
but I can't get a GeoPDF to open in QGIS. If I
convert the GeoPDF to a TIF with GDAL, it still
will not open and gives error "Missing Codec".
Very surprising. I know from past experience that
Global Mapper v6.04 will view TIF files that have
been converted from GeoPDF via GDAL.
Mike
On 4/20/20 5:00 PM, [email protected] wrote:
It sounds like you downloaded a new USGS product format called the GeoPDF. The ".pdf" suffix is the big clue. I don't know if QGIS 3.2.3 can read those files. I would try downloading the map in a different format. I don't know what site you are using, but the USGS TopoView site (https://ngmdb.usgs.gov/topoview/) has the maps available as JPEG, KMZ, GeoTIFF, and GeoPDF. I would recommend the GeoTIFF format as all versions of QGIS support that.
Best,
++Eric Fielding
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