> For the complete documentation index, see [llms.txt](https://hydrosense.gitbook.io/ildas/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hydrosense.gitbook.io/ildas/technical/model-parameters.md).

# Model Parameters

ILDAS requires a set of parameters that can be sourced from global or local data products.

| Geophysical Parameters | Source                |
| ---------------------- | --------------------- |
| Elevation              | SRTM DEM , MERIT DEM​ |
| Slope and Aspect​      | SRTM DEM , MERIT DEM​ |

| Soil Parameters                                                        | Source                                   |
| ---------------------------------------------------------------------- | ---------------------------------------- |
| Soil texture​                                                          | STATSGO+FAO by NCEP​                     |
| SMAP L3 Radiometer Global Daily 36 km Soil Moisture, Level-3,Version 8 | National Snow and Ice Data Center (NSDC) |
| Soil moisture station data                                             | IMD, ISRO-SAC and COSMOS                 |

| Vegetation Parameters            | Source                                                   |
| -------------------------------- | -------------------------------------------------------- |
| GLEAM Evapotranspiration         | Global Land Evaporation Amsterdam Model                  |
| GLASS Leaf Area Index​           | University of Maryland Global Land Cover Facility (GLCF) |
| Albedo, Greenness​               | NCEP​                                                    |
| FluxSat Gross Primary Production | NASA GSFC                                                |

| Land Use/Land Cover   | Source                                                                                          |
| --------------------- | ----------------------------------------------------------------------------------------------- |
| Irrigated Cropland    | Landsat-derived Global Rainfed and Irrigated-cropland Product \[LGRIP; Teluguntla et al., 2023] |
| Irrigation fraction   | Global Map of Irrigated Areas \[GMIA; Siebert et al., 2005]                                     |
| Landcover, Land mask​ | MODIS Native (IGBP+NCEP)​                                                                       |

| Snow Parameters  | Source          |
| ---------------- | --------------- |
| Max snow albedo​ | Barlage Native​ |