[GRASS-dev] image processing modules for GRASS GIS

[Helena Mitasova]

I would certainly love to see these modules included into the  
standard GRASS release.
It would be great to put them into GRASS CVS so that they get  tested  
with
different data sets also by people who are too lazy/busy to get the  
add-ons,

Helena

Helena Mitasova
Dept. of Marine, Earth and Atm. Sciences
1125 Jordan Hall, NCSU Box 8208,
Raleigh NC 27695
http://skagit.meas.ncsu.edu/~helena/



On May 18, 2007, at 4:39 PM, Yann wrote:

> 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
> ---------------------------------------------------------------------- 
> ---------------------------
> 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)
> ---------------------------------------------------------------------- 
> ---------------------------
>
>
>
>
> The list of modules
> ---------------------------------------------------------------------- 
> ---------------------------
> 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
>
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