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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:

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