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Results tagged with topography
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user 9159
The study and mapping of land surfaces, including relief (relative positions and elevations) and the position of natural and constructed features.
2
votes
Accepted
I want to create my own topographic map
To start off, you have to choose a coordinate reference system. The one used by Openstreetmap (EPSG:3857 or 900913) does not have real meters as units, because the horizontal lengths (latidues) are al …
- 77.1k
2
votes
Why are poles missing from GIS topographic data?
There is no SRTM data of the pole regions because
the shuttle flight did not cover that area and
the nature of the recording makes it difficult to gather data from ice areas (same as some mountain r …
- 77.1k
5
votes
Accepted
Rough edges on tiles in QGIS
You get this kind of picture because every file has a different range of gray values, and QGIS scales the colours between min and max seperately. To solve this:
Create a virtual raster on all your f …
- 77.1k
1
vote
Accepted
Overlap between Google Earth and Topographic OSM
QGIS allows you to use Google Earth as background layer via the Openlayers plugin and Openstreetmap data as vector layer on top of it. Using OSM data via the Openlayers plugin would not bring the desi …
- 77.1k
1
vote
How can I properly clip a shapefile to get the section I want using QGIS?
Please DO NOT use Set CRS for Layer if you want to reproject a vector layer to another CRS. This will corrupt your data, because it does not recalculate any coordinates.
Use Rightclick Save As ... un …
- 77.1k
2
votes
Combine multiple USGS topo quads into a single seamless raster?
My best advice is to follow the instructions provided by the GDAL devs at https://trac.osgeo.org/gdal/wiki/USGS_PDF_Topo
It contains a python script to extract the neatline from the PDF metadata.
Un …
- 77.1k
2
votes
Mercator vs. Web Mercator for Large Scale Topographic Maps
It depends on the extent of your area of interest.
Transverse mercator is conformal along the central meridian, while Mercator (in its original form) is conformal along the center latitude. That does …
- 77.1k