[GRASS-user] r.convergence vs TCI (r.terraflow). Difference?

[Helmut Kudrnovsky]

>Dear community,
>Can someone explain me the difference between r.convergence and  the TCI
calculated by r.terraflow.

from the manuals:

https://grass.osgeo.org/grass71/manuals/r.terraflow.html

r.terraflow also computes the tci raster (topographic convergence index,
defined as the logarithm of the ratio of flow accumulation and local slope). 

https://grass.osgeo.org/grass70/manuals/addons/r.convergence.html

Convergence index is a terrain parameter which show the structure od the
relief as a set of convergent areas (channels) and divergent areas (ridges).

AFAIU r.convergence calculates kind of geomorphological items (convergent
areas (channels) and divergent areas (ridges)); r.terraflow's tci indicates
terrain derivatives (ratio of flow accumulation and local slope).



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best regards
Helmut
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