[Home]LDAS (Data)-WM

NASA Task | Recent Changes

Earth Science Products from the Land Data Assimilation System (LDAS)

Point of Contact for LDAS Data:

Website:

Product Name Product Definition Product Units Spatial Resolution Temporal Resolution Coverage Area Product Format Period of Product Availability
Directional Hemispheric Reflectance (DHR) Photosynthetically Active Radiation (PAR) A measure of the amount of photosynthetically active radiation (PAR) absorbed by the surface (vegetative and non-vegetative) under ambient and direct illumination conditions. [PAR band covers the 400 - 700 nm wavelength] No Units 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Fractional Absorbed PAR (FPAR) An estimate of the photosynthetically active radiation (PAR) absorbed by live vegetation divided by incident PAR irradiance [PAR (photosynthetically active radiation) band covers the 400 - 700 nm wavelength] No Units 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Leaf Area Index (LAI) One-side green leaf area per unit ground area, integrated from canopy top to the ground No Units 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Normalized Difference Vegetation Index (NDVI) Normalized Difference Vegetation Index (NDVI) or “greenness index” provides a measure of the vegetation’s health and the stress that is affecting the vegetation. It is calculated as a ratio using atmospherically corrected reflectances from the visible and near infrared No Units 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Snowfall (Frozen Precipitation) Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Rainfall (Unfrozen Precipitation) Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Surface Runoff Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Global EOS-HDF 2000-present
Snow Melt Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Average Surface Air Temperature K 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Global EOS-HDF 2000-present
Surface Albedo Total reflectance of solar radiation at the surface % 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Snow Pack Water Equivalent Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Plant Canopy Surface Water Storage Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999t
Layer 1 Soil Moisture Soil moisture in the first 10 cm. Kg/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Bare Soil Evaporation W/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Snow Evaporation W/m2 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Snow Depth m 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Snow Cover % 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
u Wind Component m/s 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
v Wind Component m/s 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999
Surface Pressure Not adjusted to sea level. Pa 1/8th Degree on regular Lat/Lon grid, 464 X 224 Hourly Continental United States Gridded Binary October 1996-September 1999


NASA Task | Recent Changes

Last edited October 31, 2006 1:45 pm by 10.40.160.73