Parameters
Elevation
WLDAS uses a digital elevation model from the Shuttle Radar Topography Mission (SRTM) and the United States Geological Survey’s 30-second GTOPO30 dataset.
Soils
WLDAS uses the 16-class hybrid STATSGO/FAO soil texture map. It contains 30-second data within the contiguous United States and 5-min data elsewhere. Soil textures are given as:
| Index | Texture |
|---|---|
| 1 | SAND |
| 2 | LOAMY SAND |
| 3 | SANDY LOAM |
| 4 | SILT LOAM |
| 5 | SILT |
| 6 | LOAM |
| 7 | SANDY CLAY LOAM |
| 8 | SILTY CLAY LOAM |
| 9 | CLAY LOAM |
| 10 | SANDY CLAY |
| 11 | SILTY CLAY |
| 12 | CLAY |
| 13 | ORGANIC MATERIAL |
| 14 | WATER |
| 15 | BEDROCK |
| 16 | OTHER (land-ice) |
Vegetation Class/Mask
WLDAS uses the 1-km IGBP NCEP landcover classification
| Index | Texture |
|---|---|
| 1 | Evergreen Needleleaf Forest |
| 2 | Evergreen Broadleaf Forest |
| 3 | Deciduous Needleleaf Forest |
| 4 | Deciduous Broadleaf Forest |
| 5 | Mixed Forests |
| 6 | Closed Shrublands |
| 7 | Open Shrublands |
| 8 | Woody Savannas |
| 9 | Savannas |
| 10 | Grasslands |
| 11 | Permanent Wetland |
| 12 | Croplands |
| 13 | Urban and Built-Up |
| 14 | Cropland/Natural Vegetation Mosaic |
| 15 | Snow and Ice |
| 16 | Barren or Sparsely Vegetated |
| 17 | Ocean |
| 18 | Wooded Tundra |
| 19 | Mixed Tundra |
| 20 | Bare Ground Tundra |
Vegetation Parameters
WLDAS uses the standard vegetation parameters distributed with the Noah-MP model
LAI/Greenness
WLDAS uses the dynamic vegetation model described in Niu et al. (2011) and Dickinson et al. (1998).
Dickinson, R.E., M. Shaikh, R. Bryant, and L. Graumlich, 1998. Interactive Canopies for a Climate Model. Journal of Climate 11:2823–2836.
Niu, G.Y., Z.L. Yang, K.E. Mitchell, F. Chen, M.B. Ek, M. Barlage, A. Kumar, K. Manning, D. Niyogi, E. Rosero, M. Tewari, and Y. Xia, 2011. The Community Noah Land Surface Model with Multiparameterization Options (Noah-MP): 1. Model Description and Evaluation with Local-Scale Measurements. Journal of Geophysical Research Atmospheres 116:1–19.