Hi Ben.The python script should work in your version since it is written in
python 3. It us,a relatively simple routine which iterates over each sample
point and rund the saga tool. It nay take a while to run 100s of points but it
should finish.Saga is a third party, open source software suite that is
developed independantly of QGIS. It is very powerful and fast for most raster
processing. Saga also has native batch or scripting capability which may be an
option for you. Just a note that the module syntax can change with versions.
So and older script may not complete on a new release.Kirk SchmidtSent from my
Galaxy
-------- Original message --------From: Ben Jones via QGIS-User
<qgis-user@lists.osgeo.org> Date: 2024-01-14 2:23 a.m. (GMT-04:00) To: Qgis
<qgis-user@lists.osgeo.org> Subject: [Qgis-user] Calculate upslope catchment
areas for multiple points? Hello All,I have used SAGA to generate channel
networks and r.watershed to generate catchment sub-basins from Copernicus 30 m
DEM data to assist with planning a stream sediment sampling program. Once
samples are collected I would like to generate polygons that define the upslope
area for each sample point.I understand that this can be done using SAGA
Terrain Analysis ‘Upslope area’ tool that requires manually copying and pasting
the X and Y coordinates for each sample point (one point at a time which works
but is not practical for 100’s of samples, or in batches which is still not
ideal and doesn’t appear to work?).Is there an easy way to import a point file
with multiple points (100’s of points) to SAGA or another tool to automatically
calculate upslope catchment areas for each of the points?I have come across two
potential solutions:1) ‘Qgis SAGA Upslope Area for several points
automation’:https://gis.stackexchange.com/questions/342333/qgis-saga-upslope-area-for-several-points-automation2)
‘Snap pour points and delineate multiple catchments in
QGIS’:https://www.youtube.com/watch?v=Hqc_1CMadhAHowever, both are three years
old and it appears there are complications using both these methods in newer
versions of QGIS3. Are there alternative methods?I am using QGIS 3.28.11a on
macOS
Monterey.Thanks,Ben_______________________________________________QGIS-User
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