One good source might be https://www2.jpl.nasa.gov/srtm/ - the Space
Shuttle Radar Topography Data.
If you're working in Canada you could check to see if the province has
an open data portal with elevation data.
Good luck!
Randy
On 3/28/20 4:42 AM, Andreas Neumann wrote:
Hi Brock,
Perhaps the semi-automated "Raster Tracer" plugin could help?
See http://plugins.qgis.org/plugins/raster_tracer/ ,
https://github.com/mkondratyev85/raster_tracer/ and a video
demonstrating how to use it https://www.youtube.com/watch?v=D3Mh4wpSEMM
I think you need a proper raster data source for it (RGB for now) and
it probably wouldn't work on tiled raster, such as served by Base
Maps. But there might be solutions to convert a tiled base map to a
GeoTIFF file ...
Or you get to the source, like the USGS topo file, which should be
available as Geotiff files.
Hope this helps a bit.
Greetings,
Andreas
Am 28.03.20 um 01:09 schrieb Brock Riedell:
Does anybody know if it is possible to extract the contour lines (say
as a shapefile) from a windowed portion of ESRI Topo (as available on
QuickMapServices)? I'm working on an minerals exploration project
with very limited topo coverage, and would far prefer to use the ESRI
contours.
Brock
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--
Randal Hale
[email protected]
(p) 423.653.3611
http://www.northrivergeographic.com
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