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 domain and grid is the same as the NLDAS 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)

 

This NCA-LDAS file contains various masks as depicted below:

The following figure shows the CONUS (contiguous United States) mask for the NCA-LDAS domain:

image of NCA-LDAS CONUS mask

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:

image of NCA-LDAS NCAregions mask

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:

image of NCA-LDAS USDMregions mask

The following figure shows the mask for the USGS HUC02 river basins for the NCA-LDAS domain:

image of NCA-LDAS USGSHUC mask

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:

image of NCA-LDAS Columbia-Upper-Colorado mask

The following figure shows the mask for the regions of the National Weather Service's River Forecast Centers:

image of NCA-LDAS NWS-RFCs mask

The following figure shows the mask for the Sturm snow classes:

image of NCA-LDAS Sturm-snow-classes mask