User:Yann

Yann Henri CHEMIN

French, 33 years.

Like Sci-Fi and AD&D. Prefer bird-songs to traffic jams honks. Believe that gravito-magnetic science will solve our actual pollution problem. Tries to speak Pythonic these days...

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Contributed programs to GRASS GIS

i.uslek creates USLE K factor (soil erodibility) from sand, clay, silt fractions and organic matter fraction. Based on USDA 1951 (p209) quoted in FAO World Soil CD, and from some generic [soil class+OM] to K conversion table.

i.usler calculate the USLE erosivity factor of precipitations, 4 equations are available.

i.albedo creates Albedo. This module takes Modis, Aster, Landsat or AVHRR individual surface reflectance bands to calculate Albedo. This module is a precursor to r.sun or any Energy-Balance related processing.r.albedo

i.emissivity calculate emissivity from NDVI.

i.eb.* 10+ modules of Energy Balance related processing according to SEBAL model (Bastiaanssen, 1995).

i.vi Vegetation indices (13), single CPU (Baburao Kamble prepared the functions). MPI and grid versions prepared by Shamim Akhter

i.dn2ref.* Calibrate and correct DN to Top of Atmosphere Reflectance (Landsat 7 and Aster versions).

r.gaswap.serial single-cpu version of SWAP + Genetic Algorithms. Cluster and grid versions prepared by Shamim Akhter.

i.evapo.potrad Potential evapotranspiration (radiative method).

i.dn2potrad.l7 tries to do it automatically from raw DN values by reading header file of Landsat 7.

i.evapo.PT, potential evapotranspiration from Prestley-Taylor.

i.evapo.MH, reference evapotranspiration by Hargreaves and Modified Hargreaves.

i.evapo.PM, ET potential by Penman-Monteith method and i.atcorr, Atmospheric Correction of satellite images based on 6S. Both ported back the modules into the current GRASS GIS version, after doing some code cleaning.