|Download these Grids|
(Self-extracting .exe of ArcInfo Export files (*.e00)
The reference for these datasets are:
Fennessey, N.M., and R. M. Vogel, Regional Models of Potential Evaporation and Reference Evapotranspiration for the Northeast USA , Journal of Hydrology, Vol. 184, pp. 337-354, 1996.
Fennessey, N.M., “Estimating Average Monthly Lake Evaporation in the Northeast United States”, J. of American Water Resources Association, Vol. 36, pp. 759-769, 2000.
Fennessey, N. M., J. Dyment, K. Burlingame, J. Quintal, D. Walsh and N. Gianferante. “Monthly Maps of Mean Daily Free Surface Evaporation and Reference Evapotranspiration, Volumes 1-9”, UMass-Dartmouth Department of Civil and Environmental Engineering, Hydrology and Water Resources Group Publication, October 1998.
Monteith, J.L., (1965), “Evaporation and the environment. The state and movement of water in living organisms”. Symposium of the Society of Experimental Biologists, XIX, 1965
Penman, H.L., (1948), “Natural evaporation from open water, bare soil and grass”, Proc. of the Royal Society of London, Ser. A, 193, pp. 120-148, 1948.
MassGIS stores the data in two series of statewide ArcSDE raster datasets. The 12 average monthly reference crop evapotranspiration rasters are named ET_<month>_G and the 12 potential evaporation from open water bodies rasters are named EP_<month>_G, where <month> is the month number, 1 to 12.
The data are distributed in ESRI Grid ArcInfo export files.
Text files delivered by Neil M. Fennessey to MassGIS were generated using a 30 degree arc-second digital elevation model; NOAA Summary-of-the-Day period-of-record mean monthly temperature data were interpolated to each grid square using an inverse-distance squared interpolation as described by Fennessey et al. (1998). This work was funded by the U.S. Geological Survey Water Resources Institute Program grant number 1434-HQ-96-GR-02676. MassGIS converted these text files to point shapefiles. These shapefiles were projected from geographic coordinates to MA Stateplane Mainland (NAD83 meters) and these projected shapefiles were then converted to 1000-meter grids. The grids were loaded into MassGIS' Oracle-based ArcSDE geodatabase.
The unit of the value represented in each cell is millimeters per day.
There will be no updates to these datasets.
Last Updated 6/2/2011