I don't know of a way to do it in QGIS, but you can use the
ST_ApproximateMedialAxis function in PostGIS. Note your PostGIS needs to be
compiled with the SFCGAL library. Note that not all PostGIS installers will
include SFCGAL.
Also you may still need to clean up the data further, my understanding is that
this is a very difficult problem and an area of research in computer science.
https://postgis.net/docs/ST_ApproximateMedialAxis.html
-Thayer
On Tuesday, October 12, 2021, 05:46:01 AM EDT,
[email protected] <[email protected]>
wrote:------------------------------
Message: 3
Date: Mon, 11 Oct 2021 18:49:23 -0600
From: Allan L?pez <[email protected]>
To: [email protected]
Subject: [Qgis-user] Middle line of a river basin
Message-ID:
<CABOeUQ-jaGXtfoZZsN=44nn8xtfvxixf_jgxwvndq3j6_fj...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Dear All,
I need to automatically delineate the middle line of a river basin/valley
bounded by a Shp and then to construct lines perpendicular to it spaced at
will. All this to get the
Transverse topographic symmetry factor (T).
My appreciation in advance,
Allan L?pez
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