Hi all,

There is a group of modules about satellite image processing in the GRASSSVN

Add-ons repository that I am working on. Today, i've been suggested to write

this email.

I would like to ask whether some people would be interested in expanding the

standard raster menu of GRASS with some of these modules contained in this

set. A large part is composed of r.eb.* modules, dedicated to energy balance

calculations ultimately leading to Actual evapotranspiration estimations.

Already i.atcorr was in GRASS 5.x, and there were interests to return it into

6.x.

thanks

Yann

Additional info below:

This is a Brief ID card

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Name: GIPE, the GRASS Image Processing Environment.

Objective: To group a set of modules aiming at processing some common

satellite imagery from Digital Number up to some high level products that may

be useful on their own. A clear interest is in the many modules of

Evapotranspiration (ET: mm/day), but some others are there too (biomass,

Vegetation Indices, Albedo, etc).

Number of modules: 33 so far (+2 from other authors: h.evapo.PM and i.atcorr)

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The list of modules

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Extern:

- i.atcorr: 6s atmospheric correction model wrapper, ported to 6.x cvs,

including needed code cleaning

- h.evapo.PM: renamed r.evapo.PM, Potential ET after Penman and Monteith

List:

- r.dn2ref.l7: convert DN to radiance and/or reflectance for Landsat 7

- r.dn2full.l7: use .met file to convert all automatically into reflectance

(including temperature radiance for temperature bands)

- r.dn2ref.ast: convert DN to radiance and/or reflectance for Terra Aster ( 9

bands)

- r.vi: 13 types of vegetation indices (mpi and Ninf/G grid versions for

educational purposes)

- r.albedo: input to r.sun, calculates Albedo from NOAA AVHRR, MODIS, Landsat

and Aster.

- r.latitude: calculates a latitude map (degrees)

- r.sunh: calculates potential sunshine hours

- r.sath: calculates the satellite overpass time

- r.evapo.MH: Reference ET after Hargreaves and Modified Hargreaves

- r.evapo.PT: Potential ET after Prestley and Taylor

- r.evapo.potrad: Potential ET from Net radiation

- r.dn2potrad.l7: use .met file of Landsat 7 to calculate potential ET

directly from Digital Numbers.

- r.eb.eta: ET calculation after SEBAL

- r.eb.z0m: surface roughness estimation

- r.eb.deltat: difference air-surface temperature

- r.eb.netrad: net radiation

- r.eb.disp: displacement height

- r.eb.molength: Monin-Obukov Length

- r.eb.psi: Psichrometric parameters for heat

- r.eb.ublend: blending height wind speed

- r.eb.ustar: nominal wind speed

- r.eb.rah: aerodynamic resistance to heat transport

- r.eb.g0: soil heat flux

- r.eb.h0: sensible heat flux

- r.eb.h_iter: sensible heat flux with iterative adjustment of some parameters

- r.eb.evapfr: evaporative fraction calculation and soil moisture estimation

- r.biomass: Calculate biomass growth of a plant (main input to yield

estimations)

(these are not image processing directly, but they got created on some job so

i keep them in the same place)

- r.uslek: Calculates the USLE K factor from percentage of sand, loam, clay

and organic matter.

- r.usler: Calculates USLE R factor from any one of 4 different standard

equations.

--

Yann Chemin

Sainte-Anne d'Auray, France