i.eb.z0m calculates the momentum roughness length (z0m) and
optionally the surface roughness for heat transport (z0h) as per
SEBAL requirements from Bastiaanssen (1995).
Default: calculating from a NDVI with an deterministic equation, as seen in Bastiaanssen (1995).
Flag -p : calculating from a SAVI with an empirical equation, as seen in Pawan (2004).
This is a typical input to sensible heat flux computations of any energy balance modeling.
The NDVI map input and the ndvi_max operation set, is only to get a
linear relationship from NDVI to vegetation height. The latter being
related to z0m by a factor 7.
If you happen to have a vegetation height (hv) map, then z0m=hv/7 and z0h=0.1*z0m.
- Bastiaanssen, W.G.M., 1995. Regionalization of surface flux
densities and moisture indicators in composite terrain; a remote
sensing approach under clear skies in mediterranean climates. PhD
thesis, Wageningen Agricultural Univ., The Netherland, 271 pp.
- Chemin, Y., 2012.
A Distributed Benchmarking Framework for Actual ET Models,
in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech.
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