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I do this by getting the Strahler stream order for all stream
reaches (using the GRASS r.stream.order addon). Then I display the
streams with line width determined by the stream order. Looks pretty
nice :-)<br>
<shameless plug><br>
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il/strahler-stream-order-in-grass/">http://www.surfaces.co.il/strahler-stream-order-in-grass/</a><br>
</shameless plug><br>
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<div class="moz-cite-prefix">On 07/14/2015 11:08 PM, Luca Galuppini
wrote:<br>
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<div>Dear all<br>
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i have this idea of rendering a river network so
that each river starts as a very thin blue line, and
the line width increases little by little as the
river goes.<br>
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i wouldn't like to modify the original file (eg
cutting rivers in pieces and give a different width to
each piece) but all rivers are digitized with the
right direction so i was wondering if there is an
expression to teach qgis what is the start end of a
river, and assign a wider line for any given distance,
for example:<br>
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from start to 200m - line width 0.1<br>
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from 200m to 400m - line width 0.2<br>
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from 400m and over - line width 0.3<br>
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i think this is an interesting problem because i cannot find a
"from - to" command in qgis expression language, neither i
know how to properly exploit the line direction with code,
which would come useful in many other ways...<br>
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any python expert out there can help?<br>
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