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Opening historical USGS Geotiff maps in QGIS
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I was surprised, and repeatedly, stumped by not being able to load historical (like 1907) USGS GeoTIFF topographic maps (from topoView into QGIS) and have them properly georeferenced.
My central California maps were consistently displayed in North Africa, even with the OTF projection turned on.
After a lot of head-scratching and searching online, I finally decided to download the geoPDF version. That projected exactly where I expected it to be mapped. So I opened up the properties of that geoPDF file and copied the Coordinate Reference System that it used to project the GeoTIFF file.
It turned out that the CRS was rather weird: " * Generated CRS (+proj=poly +lat_0=0 +lon_0=-121.625 +x_0=0 +y_0=0 +datum=NAD27 +units=m +no_defs)". And it worked just great! I would've never guessed to use something like that.
coordinate-system geotiff-tiff usgs
edited 58 secs ago
Taras
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asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
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I was surprised, and repeatedly, stumped by not being able to load historical (like 1907) USGS GeoTIFF topographic maps (from topoView into QGIS) and have them properly georeferenced.
My central California maps were consistently displayed in North Africa, even with the OTF projection turned on.
After a lot of head-scratching and searching online, I finally decided to download the geoPDF version. That projected exactly where I expected it to be mapped. So I opened up the properties of that geoPDF file and copied the Coordinate Reference System that it used to project the GeoTIFF file.
It turned out that the CRS was rather weird: " * Generated CRS (+proj=poly +lat_0=0 +lon_0=-121.625 +x_0=0 +y_0=0 +datum=NAD27 +units=m +no_defs)". And it worked just great! I would've never guessed to use something like that.
coordinate-system geotiff-tiff usgs
edited 58 secs ago
Taras
2,1672624
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I was surprised, and repeatedly, stumped by not being able to load historical (like 1907) USGS GeoTIFF topographic maps (from topoView into QGIS) and have them properly georeferenced.
My central California maps were consistently displayed in North Africa, even with the OTF projection turned on.
After a lot of head-scratching and searching online, I finally decided to download the geoPDF version. That projected exactly where I expected it to be mapped. So I opened up the properties of that geoPDF file and copied the Coordinate Reference System that it used to project the GeoTIFF file.
It turned out that the CRS was rather weird: " * Generated CRS (+proj=poly +lat_0=0 +lon_0=-121.625 +x_0=0 +y_0=0 +datum=NAD27 +units=m +no_defs)". And it worked just great! I would've never guessed to use something like that.
coordinate-system geotiff-tiff usgs
edited 58 secs ago
Taras
2,1672624
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I was surprised, and repeatedly, stumped by not being able to load historical (like 1907) USGS GeoTIFF topographic maps (from topoView into QGIS) and have them properly georeferenced.
My central California maps were consistently displayed in North Africa, even with the OTF projection turned on.
After a lot of head-scratching and searching online, I finally decided to download the geoPDF version. That projected exactly where I expected it to be mapped. So I opened up the properties of that geoPDF file and copied the Coordinate Reference System that it used to project the GeoTIFF file.
It turned out that the CRS was rather weird: " * Generated CRS (+proj=poly +lat_0=0 +lon_0=-121.625 +x_0=0 +y_0=0 +datum=NAD27 +units=m +no_defs)". And it worked just great! I would've never guessed to use something like that.
coordinate-system geotiff-tiff usgs
coordinate-system geotiff-tiff usgs
edited 58 secs ago
Taras
2,1672624
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 58 secs ago
Taras
2,1672624
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 58 secs ago
Taras
2,1672624
edited 58 secs ago
Taras
2,1672624
edited 58 secs ago
Taras
2,1672624
2,1672624
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
asked 16 mins ago
Marc HoshovskyMarc Hoshovsky
1
1
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Marc Hoshovsky is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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