NCA-LDAS Specifications
The NCA-LDAS domain covers the contiguous United States, as well as portions of Canada and Mexico, extending from 25 to 53 North, and -125 to -67 West. The spatial resolution of the simulations and datasets is 1/8th-degree over this domain.
The NCA-LDAS grid is defined as follows:
*Table below scrolls to right
| Position | Grid Column | Grid Row | Longitude | Latitude |
|---|---|---|---|---|
| Lower Left | 1 | 1 | -124.9375 | 25.0625 |
| Lower Right | 464 | 1 | -67.0625 | 25.0625 |
| Upper Right | 464 | 224 | -67.0625 | 52.9375 |
| Upper Left | 1 | 224 | -124.9375 | 52.9375 |
(latitude/longitude values represent center of 1/8th-degree grid boxes)
The NCA-LDAS land/water, CONUS, NCA regions, USDM regions, USGS HUC river basins, Columbia/Upper Colorado river basins, NWS River Forecast Center regions, and Sturm snow classes mask files will soon be made available on this page.
The following figure shows the CONUS (contiguous United States) mask for the NCA-LDAS domain:
The following figure shows the mask for the six (6) NCA regions for the NCA-LDAS domain. Note that a separate mask is also available that splits the Great Plains region into northern (MT, ND, SD, WY, NE) and southern (KS, OK, TX) regions:
The following figure shows the mask for the U.S. Drought Monitor (USDM) regions for the NCA-LDAS domain. According to the USDM definitions, WY and CO are included in both the West and in the High Plains regions:
The following figure shows the mask for the USGS HUC02 river basins for the NCA-LDAS domain:
The following figure shows the mask for the Columbia river basin as well as for the Upper Colorado river basin for the NCA-LDAS domain:
The following figure shows the mask for the regions of the National Weather Service's River Forecast Centers:
The following figure shows the mask for the Sturm snow classes:
