Calculate Height Above the Nearest Drainage (HAND) with QGIS using the PCRaster Tools Plugin

[@rchlumsk]

Highly useful video and great set of tools, thanks!

[@yancheng2980]

while calculating ddl, I received this error -> PCRaster library is not available. Do you perhaps know why?

[@HansvanderKwast]

You need to install PCRaster before installing the plugin. Here's the documentation of the plugin with the steps: jvdkwast.github.io/qgis-processing-pcraster/

[@yancheng2980]

@@HansvanderKwast Thanks a lot!

[@HermanBooysen101]

Thank you, Hans.

[@josephbergholz350]

Hi! This helped me a lot, thanks for the video! After all this I need to use a vector of the rivers as a mask over another map, but instead of giving me a raster with the rivers as a line it gives me the whole area of the project. I would really appreciate any help.

[@florindanoula3227]

Thanks a lot. This Video helps me to find my way👍

[@abubakarrjalloh4900]

Is this available for arcgis?

[@WilliamProcter-d7h]

Thanks for this. This is exactly what i was looking for. However, when i try to run the "lddcreate" tool, it takes forever and eventually crashes QGIS. I have also tried running directly in pthon and have the same issue - there is no error retuned, it just doesn't finish. Any help would be much appreciated

[@HansvanderKwast]

Either the DEM has a too high resolution or covers a too large area for the memory available on your machine. Solutions: use a coarser, smaller DEM or try to do this workflow with another algorithm for flow direction rasters. This is tricky because they are encoded differently for different tools. See also kzbin.info/www/bejne/q2qbc6l7mL97aa8si=Azafb5jwnOX1WoPz

[@WilliamProcter-d7h]

@@HansvanderKwast Thank you - i will try your recommendations. And thank you for your quick response :)

[@casherasmussen192]

How did you determine the flow accumulation threshold?

[@HansvanderKwast]

You need to calibrate it with a reference. For example a satellite image or map with the river network. You then choose the threshold that matches best with the reference.

[@casherasmussen192]

@@HansvanderKwast Thanks for your response. I guess I'm still a bit unclear as to what the threshold is. Are you extracting an attribute from the network?

[@researcherahmedadelsaleh9019]

Thank you

[@piotr_jurkiewicz]

Wow