NLDAS Specifications

The NLDAS domain extends from 25 to 53 North and -125 to -67 West.

The NLDAS Grid is defined as follows:

(latitude/longitude values represent center of 1/8th-degree grid boxes)

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

NLDAS Unified Mask

The image and data files in this section are for the NLDAS unified mask and are based on unadjusted 1-km University of Maryland vegetation data. This NLDAS unified mask is used in all NLDAS modeling efforts.
image of NLDAS unified land/water mask
NLDAS unified land/water mask (JPEG, 22kb)

NLDAS Mask over CONUS

The image and data files in this section are for a mask over the CONUS (contiguous United States) region of the NLDAS domain.
image of NLDAS CONUS mask
NLDAS CONUS mask (GIF, 28kb)

  • (Binary) - NLDASmask_CONUS.bin
    This file contains the NLDAS CONUS mask in binary format. You may find NLDASmask_CONUS.F90 helpful to read the file, as well as a NLDASmask_CONUS.ctl GrADS control file.
  • (ASCII) - NLDASmask_CONUS.asc
    This ASCII file contains the NLDAS CONUS mask in the following format:

    Column 1 Grid Column Number
    Column 2 Grid Row Number
    Column 3 Latitude (center of 1/8th-degree grid boxes)
    Column 4 Longitude (center of 1/8th-degree grid boxes)
    Column 5 Mask Value (0 = outside of CONUS; 1 = CONUS)