[Qgis-user] Extracting contours from ESRI topo?

[Randal Hale]

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
rjhale at northrivergeographic.com
(p) 423.653.3611
http://www.northrivergeographic.com

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