NLDAS Elevation Illustrations and Datasets

The 1/8th-degree resolution topographic datasets and illustrations featured below are based on the GTOPO30 Global 30 Arc Second (~1-km) Elevation Dataset. In particular, average elevation values over the NLDAS domain were arrived at by isolating the relevant subset of data from the ~1-km global dataset, and then averaging up to the 1/8th-degree NLDAS resolution. Slope and aspect values were then derived from this 1/8th-degree data. Maximum, minimum and standard deviation values, by contrast, were calculated directly from the ~1-km values which lie within each 1/8th-degree NLDAS grid box. Raw datasets were supplied by Steve Graham, Department of Geological Sciences, University of Texas at Austin.

NLDAS Topographical Illustrations

Mean elevation (meters) over 1/8th-degree NLDAS domain. Values range up to 3600 meters over portions of the Rocky Mountains.
Mean Elevation Over the NLDAS Domain

Maximum elevation (meters) over 1/8th-degree NLDAS domain. Values are greater than 3600 meters over portions of the Rocky Mountains.
Maximum Elevation Over the NLDAS Domain

Minimum elevation (meters) over 1/8th-degree NLDAS domain. Values range up to 3200 meters over portions of the Rocky Mountains.
Minimum Elevation Over the NLDAS Domain

Standard deviation of elevation values over 1/8th-degree NLDAS domain. Values can surpass 350 over western regions of the domain.
Standard Deviation of Elevation Values Over the NLDAS Domain

Slope values over 1/8th-degree NLDAS domain. Values can surpass 1.6 over western regions of the NLDAS domain.
Slope Values (In Degrees) Over NLDAS Domain

Aspect values over 1/8th-degree NLDAS domain. Values are generally 0-150 over the middle portion of the domain, and are greater than 150 over the remainder of the domain.
Aspect Values Over NLDAS Domain

NLDAS Topographical Datasets

All of the ASCII datasets available below contain data 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 Data Value