1. General Model Information

Name: Prototype Biomass and Evapotranspiration model

Acronym: PROBE

Main medium: terrestrial
Main subject: biogeochemistry
Organization level:
Type of model: not specified
Main application:
Keywords: forest, vegetation growth, evapotranspiration, biomass, GIS, remote sensing


Dr. Stephen J. Maas
USDA-ARS Remote Sensing Research Unit
2413 East Highway
83 Weslaco
TX 78596-8344
Phone: 512 969-4838
Fax : 512 565-6133



PROBE (Prototype Biomass and Evapotranspiration model) is a vegetation growth and soils water-balance simulation model that includes an iterative numerical procedure for incorporating remotely sensed information. The purpose of the model is to assist resource managers in estimating regional evapotranspiration and biomass production.

The model requires mean daily air temperature, humidity, wind speed and total daily solar radiation as input data. Surface reflectance and temperature data are required from remote sensing sources [e.g. Landsat Multi-Spectral Scanner (MSS) or Thematic Mapper (TM) or NOAA's Advanced Very High Resolution Radiometer (AVHRR)]. The model provides daily estimates of biomass production, evapotranspiration and soil moisture. The model may be incorporated into a Geographic Information System (GIS) for producing estimates of vegetation and soil water-balance at regional scale (Maas et al., 1992).

Author of the abstract:


II. Technical Information

II.1 Executables:

Operating System(s): DOS

II.2 Source-code:

Programming Language(s): Basic and ANSI Standard FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Maas, S.J., Moran, M.S.,and Jackson, R.D., 1992.
Combining remote sensing and modeling for regional resource monitoring, Part II: A simple model for estimating surface evapotranspiration and biomass production. Technical Papers, ACPRS/ACSM/ RT92 Convention, 3-8 August 1992, Washington DC, pp. 225-254.

V. Further information in the World-Wide-Web

VI. Additional remarks

This model is one of only a few in this survey that use GIS and remotesensing data. Execution of the model is limited only by the available remotesensing information. This model addresses the USGCRP desire to integrate GISand models.

Last review of this document by: R. Patzak : 17. September 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:47 CEST 2002

Go back to Register of Ecological Models (R E M)