Hi Neven, I think this image showing the tangential plane in relation to those of plane and profile curvature makes it quite clear:

http://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Minimal_surface_curvature_planes-en.svg/850px-Minimal_surface_curvature_planes-en.svg.png

Dear Neven,

after Schmidt et al. the" tangential curvature is calculated perpendicular to the slope gradient". This might be indicatiing whether you have a confluence of flow, i.e. a linear water flow or diospersion of flow. The latter would not be modelled with a simple D8 FLOWDIR in ArcGIS and needs for self implemanting.

Besides, I was working in the same group as Jochen Schmidt and he found that some of the geomorphometric analysis tools in ArcGIS weren't working as expected. Might be better today but vigilance is required.

Since,

Thank you!

This is helpful!

Hi, Neven

spiraltectonic.com , this is my site in golobal tectonics based on geomorphology it may be usefull for you.

Best regards, Asadiyan