Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current 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: Monday Jan 30 19:52:26 2023 in commit: cac8d9d848299297977d1315b7e90cc3f7698730
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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