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<p>One good source might be <a class="moz-txt-link-freetext" href="https://www2.jpl.nasa.gov/srtm/">https://www2.jpl.nasa.gov/srtm/</a> - the
Space Shuttle Radar Topography Data. <br>
</p>
<p>If you're working in Canada you could check to see if the
province has an open data portal with elevation data. <br>
</p>
<p>Good luck! <br>
</p>
<p>Randy<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 3/28/20 4:42 AM, Andreas Neumann
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:30c04603-a9a5-9cef-7201-77c8ac377456@carto.net">
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<p>Hi Brock,</p>
<p>Perhaps the semi-automated "Raster Tracer" plugin could help?</p>
<p>See <a href="http://plugins.qgis.org/plugins/raster_tracer/"
moz-do-not-send="true">http://plugins.qgis.org/plugins/raster_tracer/</a>
, <a href="https://github.com/mkondratyev85/raster_tracer/"
moz-do-not-send="true">https://github.com/mkondratyev85/raster_tracer/</a>
and a video demonstrating how to use it <a
href="https://www.youtube.com/watch?v=D3Mh4wpSEMM"
moz-do-not-send="true">https://www.youtube.com/watch?v=D3Mh4wpSEMM</a>
<br>
</p>
<p>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 ...</p>
<p>Or you get to the source, like the USGS topo file, which should
be available as Geotiff files.</p>
<p>Hope this helps a bit.<br>
</p>
<p>Greetings,</p>
<p>Andreas<br>
</p>
<div class="moz-cite-prefix">Am 28.03.20 um 01:09 schrieb Brock
Riedell:<br>
</div>
<blockquote type="cite"
cite="mid:b7bce7bd-f451-062a-658f-0692929a9ccb@shaw.ca">
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charset=UTF-8">
<tt>Does anybody know if it is possible to extract the contour
lines (say as a shapefile) </tt><tt><tt>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.<br>
<br>
Brock<br>
<br>
</tt></tt> <br>
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<pre class="moz-signature" cols="72">--
Randal Hale
<a class="moz-txt-link-abbreviated" href="mailto:rjhale@northrivergeographic.com">rjhale@northrivergeographic.com</a>
(p) 423.653.3611
<a class="moz-txt-link-freetext" href="http://www.northrivergeographic.com">http://www.northrivergeographic.com</a></pre>
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