Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
NAME
i.evapo.zk - Computes global evapotranspiration calculation after Zhang, Kimball, Nemani and Running formulation, 2010.KEYWORDS
imagery, evapotranspirationSYNOPSIS
i.evapo.zk
i.evapo.zk --helpi.evapo.zk biome_type=name ndvi=name airtemperature=name specifichumidity=name atmosphericpressure=name netradiation=name soilheatflux=name elevation=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- biome_type=name [required]
- Name of input IGBP biome type raster map [-]
- ndvi=name [required]
- Name of input Normalized Difference Vegetation Index raster map [-]
- airtemperature=name [required]
- Name of input air temperature raster map [C]
- specifichumidity=name [required]
- Name of input specific humidity raster map [-]
- atmosphericpressure=name [required]
- Name of input atmospheric pressure raster map [Pa]
- netradiation=name [required]
- Name of input net radiation raster map [MJ/m2/d]
- soilheatflux=name [required]
- Name of input soil heat flux raster map [MJ/m2/d]
- elevation=name [required]
- Name of input elevation raster map [m]
- output=name [required]
- Name of output evapotranspiration raster map [mm/d]
Table of contents
DESCRIPTION
i.evapo.zk Calculates the global diurnal evapotranspiration after Zhang, Kimball, Nemani and Running (2010).NOTES
Main function ETa (biome_type, ndvi, tday, sh, patm, Rn, G)- Biome_type as defined below
- ndvi NDVI value [-]
- tday day temperature [C]
- sh specific humidity [-]
- patm atmospheric pressure [Pa]
- Rn day net radiation [MJ/m2/d]
- G day soil heat flux [MJ/m2/d]
- Code ID Description
- BENF 0 Boreal Evergreen Needleleaf Forest (less or eq 212 frost-free days)
- TENF 1 Temperate Evergreen Needleleaf Forest (more than 212 frost-free days)
- EBF 2 Evergreen Broadleaf Forest
- DBF 4 Deciduous Broadleaf Forest
- CSH 6 Closed Shrubland
- OSH 7 Open Shrubland
- WSV 8 Woody Savannah
- SV 9 Savannah
- GRS 10 Grassland
- CRP 12 Cropland
- 01 Evergreen Needleleaf Forest
- 02 Evergreen Broadleaf Forest
- 03* Deciduous Needleleaf Forest
- 04 Deciduous Broadleaf Forest
- 05* Mixed Forest (stats of other classes areas used in article)
- 06 Closed Shrublands
- 07 Open Shrublands
- 08 Woody Savannas
- 09 Savannas
- 10 Grasslands
- 11* Permanent Wetlands
- 12 Croplands
- 13* Urban and Built-Up
- 14* Cropland/Natural Vegetation Mosaic
- 15* Snow and Ice
- 16* Barren or Sparsely Vegetated
- 17* Water Bodies (Evaporation Priestley-Taylor used in article)
- Code Description TcloseMinC TopenMaxC VPDClosePa VPDOpenPa ToptC BetaC kPa GaMs-1 GtotMs-1 GchMs-1 B1Sm-1 B2Sm-1 B3 b1* b2* b3* b4*
- BENF Boreal Evergreen Needleleaf Forest -8 40 2800 500 12 25 150 0.03 0.002 0.08 208.3 8333.3 10
- TENF Temperate Evergreen Needleleaf Forest -8 40 2800 500 25 25 200 0.03 0.004 0.08 133.3 888.9 6
- EBF Evergreen Broadleaf Forest -8 50 4000 500 40 40 300 0.03 0.006 0.01 57.7 769.2 4.5
- DBF Deciduous Broadleaf Forest -6 45 2800 650 28 25 200 0.04 0.002 0.01 85.8 694.7 4
- MF Mixed Forest
- CSH Closed Shrubland -8 45 3300 500 19 20 400 0.01 0.001 0.04 202 4040.4 6.5
- OSH Open Shrubland -8 40 3700 500 10 30 50 0.005 0.012 0.04 178.6 178.6 8
- WSV Woody Savannah -8 50 3200 500 32 28 900 0.002 0.0018 0.04 0.2 24000 6.5 57.1* 3333.3* 8* -0.01035*
- SV Savannah -8 40 5000 650 32 30 800 0.001 0.001 0.04 790.9 8181.8 10
- GRS Grassland -8 40 3800 650 20 30 500 0.001 0.001 0.04 175 2000 6
- CRP Cropland -8 45 3800 650 20 30 450 0.005 0.003 0.04 105 3000 3
TODO
SEE ALSO
i.evapo.pmi.evapo.mh
i.evapo.senay
i.eb.netrad
i.eb.soilheatflux
REFERENCES
Zhang, K., Kimball, J.S., Nemani, R.R., Running, S.W. (2010). A continuous satellite-derived global record of land surface evapotranspiration from 1983 to 2006. WRR 46, W09522Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual ET Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech. (PDF)
AUTHOR
Yann Chemin, GRASS Development team, 2011SOURCE CODE
Available at: i.evapo.zk source code (history)
Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55
Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.
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© 2003-2023 GRASS Development Team, GRASS GIS 7.8.8dev Reference Manual