1

I extracted a channel network from a dem but due to some technical difficulties the layer had some discontinuities. So after filling them, i suddenly realised that the Strahler orders it gave me were wrong and i want to create a query on Postgresql that might work around the issue for me. What i am trying to do right now is simple, get the segments placed highest in altitude at the end of a series of channels in the shapefile i made beforehand and apply to them a value of 1 in a column i created. In short i want postgre to read my shapes and find the places where he can't find another shape placed higher and intersecting with him.

I loaded my dem raster in PostgreSQL, and already used a query to extract the mean altitudes for each segment of my vector layer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.