search

lutraconsulting / MDAL

Mesh Data Abstraction Library
http://www.mdal.xyz/
MIT License
160 stars 50 forks source link

Use arrows of mesh renderer for flow direction rasters #97

Closed jvdkwast closed 5 years ago

jvdkwast commented 5 years ago

Would it be possible to use the mesh arrow renderer for visualisation of Flow Direction rasters in QGIS? Here's a video explaining flow direction in QGIS: https://youtu.be/ZLUjSEK-nbg (Minute 12-15). The flow direction grid is generated with using the processing toolbox SAGA->Terrain Analysis->Channel network and drainage basins. But this can also be done with other tools. Different tools give a different encoding of flow direction: https://gis.stackexchange.com/questions/254939/legend-of-flow-direction-calculated-with-processing-toolbox-qgis-saga Here's a subset from the output of the SAGA tool: https://www.dropbox.com/s/j2a0qmlphr0ezrr/flowdir_saga_subset.tif?dl=0

saberraz commented 5 years ago

@jvdkwast I think we need a processing algorithm to generate virtual mesh layer from rasters. See also https://github.com/lutraconsulting/MDAL/issues/58#issuecomment-470490896

PeterPetrik commented 5 years ago

will be supported by processing alg in Crayfish 3.1.1+ (https://github.com/lutraconsulting/qgis-crayfish-plugin/commit/70bb47e363cbc50faec6a7dde2eff994889463dd)