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NASA Shuttle Radar Topography Mission Global 3 arc second Number NetCDF V003

Metadata Updated: December 7, 2023

The Land Processes Distributed Active Archive Center (LP DAAC) is responsible for the archive and distribution of NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) SRTM, which includes the global 3 arc second (~90 meter) product. The 3 arc second data was derived from the 1 arc second using sampling and averaging methods. SRTMGL3_NUMNC is used along with the SRTMGL3_NC data product and offers the number count in NetCDF.

NASA Shuttle Radar Topography Mission (SRTM) datasets result from a collaborative effort by the National Aeronautics and Space Administration (NASA) and the National Geospatial-Intelligence Agency (NGA - previously known as the National Imagery and Mapping Agency, or NIMA), as well as the participation of the German and Italian space agencies. The purpose of SRTM was to generate a near-global digital elevation model (DEM) of the Earth using radar interferometry. SRTM was a primary component of the payload on the Space Shuttle Endeavour during its STS-99 mission. Endeavour launched February 11, 2000 and flew for 11 days.

SRTM collected data in swaths, which extend from ~30 degrees off-nadir to ~58 degrees off-nadir from an altitude of 233 kilometers (km). These swaths are ~225 km wide, and consisted of all land between 60° North (N) and 56° South (S) latitude. This accounts for about 80% of Earth’s total landmass.

Improvements/Changes from Previous Versions * Voids in the Version 3.0 products have been filled with ASTER Global Digital Elevation Model (GDEM) Version 2.0, the Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010), and the National Elevation Dataset (NED).

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023
Publisher LP DAAC
Identifier C1608286031-LPDAAC_ECS
Data First Published 2013-09-04
Language en-US
Data Last Modified 2015-09-02
Category SRTM, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation NASA JPL. 2013-11-20. SRTMGL3_NUMNC.003. NASA Shuttle Radar Topography Mission Global 3 arc second number NetCDF. Archived by National Aeronautics and Space Administration, U.S. Government, NASA EOSDIS Land Processes DAAC.
Creator NASA JPL
Harvest Object Id 3d05ded9-a33f-498a-b02e-38c136cd496a
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -56.0 180.0 60.0
Program Code 026:001
Series Name SRTMGL3_NUMNC.003
Source Datajson Identifier True
Source Hash ac90dd3e4916155d145d259d3401caf89a14bc05028fcd083c85d28c71ee8de5
Source Schema Version 1.1
Temporal 2000-02-11T00:00:00Z/2000-02-21T23:59:59Z

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