[Qgis-user] Extracting contours from ESRI topo?

[Andreas Neumann]

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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