Metadata for Potential Evapotranspiration for 2000-2012 from MODIS Metadata for Potential Evapotranspiration for 2000-2012 from MODIS

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Identification Information:

Citation:

Originator: Montana Climate Office
Publication date: 02/11/2015
Title: Potential Evapotranspiration for 2000-2012 from MODIS
Online linkage: ftp://mco.cfc.umt.edu/pet/Readme.html

Browse graphic file name: http://mco.cfc.umt.edu/images/MCOPETThumbnail.jpg
Browse graphic file description: Montana Climate Office MODIS MOD16 potential evapotranspiration graphic
Browse graphic file type: JPEG

Abstract:

This raster dataset shows eight-day, monthly, yearly, eight-day normal, monthly normal and yearly normal MODIS MOD16 potential evapotranspiration in millimeters with a grid cell resolution of 1000-meters (1-kilometer) for the years 2000-2012. The MODIS MOD16 project is part of NASA/EOS project to estimate global terrestrial potential evapotranspiration from earth land surface by using satellite remote sensing data. The MOD16 PET datasets are estimated using Mu et al. improved ET algorithm (2011) over previous Mu et al. paper (2007a). The ET algorithm is based on the Penman-Monteith equation (Monteith, 1965). Surface resistance is an effective resistance to evaporation from land surface and transpiration from the plant canopy. Terrestrial ET includes evaporation from wet and moist soil, from rain water intercepted by the canopy before it reaches the ground, and the transpiration through stomata on plant leaves and stems. Evaporation of water intercepted by the canopy is a very important water flux for ecosystems with a high LAI. Canopy conductance for plant transpiration is calculated by using LAI to scale stomatal conductance up to canopy level. For many plant species during growing seasons, stomatal conductance is controlled by vapor pressure deficit (VPD) (Oren et al., 1999; Mu et al., 2007b; Running and Kimball, 2005) and daily minimum air temperature (Tmin). Tmin is used to control dormant and active growing seasons for evergreen biomes. High temperatures are often accompanied by high VPDs, leading to partial or complete closure of stomata. For a given biome type, two threshold values for Tmin and VPD are listed in the Biome-Property-Look-Up-Table (BPLUT) to control stomatal conductance (Mu et al., 2007a; 2009; 2011).

Purpose:

The MODIS MOD16 potential evapotranspiration product can be used to calculate regional water and energy balance, soil water status; hence, it provides key information for water resource management. With long-term ET data, the effects of changes in climate, land use, and ecosystems disturbances (e.g. wildfires and insect outbreaks) on regional water resources and land surface energy change can be quantified. The MOD16 global potential evapotranspiration (ET)/latent heat flux (LE)/potential ET (PET)/potential LE (PLE) datasets are regular 1-km2 land surface ET datasets for vegetated land areas at 8-day, monthly and annual intervals. The dataset covers the time period 2000 to 2012. Values are in millimetres.

Supplemental information:

Processed from NetCDF raster file source using Python 2.7 code maintained by the Montana Climate Office.

Time period of content:

Beginning date: 01/01/2000
Beginning time: 000000
Ending date: 12/31/2012
Currentness reference:: The bounding rectangle for all 4th-code NRCS hydrologic units that intersect with the boundary of the State of Montana.

Status:

Progress: Complete
Maintenance and update frequency: As needed

Access constraints: None

Use constraints:

The Montana Climate Office (MCO) provides this product/service for informational purposes only. The MCO did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The MCO provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the MCO be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The MCO makes these data and services available as a convenience to the public, and for no other purpose. The MCO reserves the right to change or revise published data and/or services at any time.

Point of contact:

State Climatologist
Director of Montana Climate Office
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.6793
E-Mail: state.climatologist@umontana.edu

Point of contact:

Michael D. Sweet
Research and Information Systems Specialist
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.5265
E-Mail: michael.sweet@umontana.edu

Data set credit:

The Numerical Terradynamic Simulation Group (NTSG) research laboratory at the University of Montana (http://ntsg.umt.edu) and the Montana Climate Office (http://climate.umt.edu/). Qiaozhen Mu, Maosheng Zhao, Steven W. Running, November 20, 2013; Algorithm Theoretical Basis Document: MODIS Global Terrestrial Potential Evapotranspiration (ET) Product (NASA MOD16A2/A3) Collection 5. NASA Headquarters. (See full PDF at https://secure.ntsg.umt.edu/publications/2013/MZR13/MOD16_ATBD.pdf).

Data Quality Information:

Logical consistency report:

Value range resulting from bilinear transformation to Montana State Plane projection is within expected range. NoData values are assigned where they existed in the source representation.

Completeness report:

Number of NoData items with respect to the total number of NoData that should have been present

Lineage:

Process step:: MODIS MOD16 data is projected to Montana State Plane NAD83 is extracted to an area-of-interest (ftp://mco.cfc.umt.edu/resources/MCO/Area-of-Interest/BoundariesMSP.gdb/area-of-interest) defined by the Montana Climate Office to encompass all major sub-basins that intersect with Montana's border. The Esri ArcGIS Spatial Analyst ExtractByMask_sa method is used. For the extract method, the source is used as a snap raster to maintain alignment of the grid cells. Pyramids are built for the result using Esri ArcGIS BuildPyramids_management method.
Process step:: Source at http://ntsg.umt.edu/project/mod16 is programmatically downloaded and projected from NAD83 geographic coordinates to Montana State Plane NAD83 using the Esri ArcGIS ProjectRaster_management method. The method uses a bilinear transformation, with a raster cell size of 1000 meters, and registers the grid cell boundary at Montana State Plane coordinates [560648.266 436475.763].