Table · collection · 2013
NASA Shuttle Radar Topography Mission Global 3 arc second number V003
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/measures/srtm/srtmgl3n.003
Description
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](earthdata.nasa.gov/about/competitive-programs/measures )) SRTM, which includes the global 3 arc second (~90 meter) number product. The NASA SRTM data sets 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.
This collaboration aims to generate a near-global digital elevation model (DEM) of Earth using radar interferometry. SRTM was the primary (and virtually only) payload on the STS-99 mission of the Space Shuttle Endeavour, which launched February 11, 2000 and flew for 11 days. The SRTM swaths extended from ~30 degrees off-nadir to ~58 degrees off-nadir from an altitude of 233 kilometers (km), creating swaths ~225 km wide, and consisted of all land between 60° N and 56° S latitude to account for 80% of Earth's total landmass.
Read the rest (6 more)
Ancillary one-byte (0 to 255) "NUM" (number) files were produced for NASA SRTM Version 3. These files have names corresponding to the elevation files, except with the extension ".NUM" (such as N37W105.NUM). The elevation files use the extension ".HGT", meaning height (such as N37W105.HGT).
The separate NUM file indicates the source of each DEM pixel; the number of ASTER scenes used (up to 100), if ASTER; and the number of SRTM data takes (up to 24), if SRTM. The NUM file for both 3 arc second products (whether sampled or averaged) references the 3 x 3 center pixel. Note that NUMs less than 6 are water and those greater than 10 are land.
The 3 arc second data was derived from the 1 arc second using sampling and averaging methods. (See Figure 3 in the User Guide) The global 3 arc second number product is also available in NetCDF4 format as the SRTMGL3_NUMNC dataset and can be used with the corresponding SRTMGL3_NC elevation product.
Known Issues
* Known issues in the NASA SRTM are described in the following publication:
- Rodriguez, E., C. S. Morris, and J. E. Belz (2006), A global assessment of the SRTM performance, Photogramm. Eng. Remote Sens., 72, 249–260. doi.org/10.14358/PERS.72.3.249
Links
Get the data
- Resource doi.org/10.5067/measures/srtm/srtmgl3n.003 ↗
The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc.
landing page · download · DOI / persistent id · from NASA CMR, data nasa gov
- DEM Comparison Guide lpdaac.usgs.gov/documents/642/DEM_Comparison_Guide.pdf ↗
documentation · download · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/179/SRTM_User_Guide_V3.pdf ↗
The technical information in the User's Guide enables users to interpret and use the data products.
documentation · download · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/13/SRTM_Quick_Guide.pdf ↗
The SRTM Quick Guide provides an overview of available products.
documentation · download · from NASA CMR, data nasa gov
- Resource doi.org/10.1029/2005rg000183 ↗
The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products.
documentation · download · from NASA CMR, data nasa gov
- search.earthdata.nasa.gov /search/granules?p=C2763268440-LPCLOUD ↗
Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data.
download · from NASA CMR
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C2763268440-LPCLOUD.iso19115 ↗
download · from data nasa gov
- Resource earthdata.nasa.gov/centers/lp-daac ↗
The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products.
download · project · from data nasa gov, NASA CMR
- Resource eospso.nasa.gov/missions/shuttle-radar-topography-mission ↗
download · from data nasa gov
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/nasa-shuttle-radar-topography-mission-global-3-arc-sec… ↗
landing page · from data nasa gov
Catalogue records · 3
- CKAN API data.nasa.gov/api/3/action/package_show?id=434d689a-ea46-486d-a830-a5012c6e5… ↗
metadata API · from data nasa gov
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2763268440-LPCLOUD.umm_json ↗
metadata API · from NASA CMR
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2763268440-LPCLOUD.html ↗
catalogue entry · from NASA CMR
Topics
Provenance · 2 source records, 20 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2763268440-LPCLOUD | 8 d ago | JSON v1 |
| NASA Data Portal | 434d689a-ea46-486d-a830-a5012c6e5709 | 5 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:engineering | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[instrument].gcmd_instrument:srtm | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/topography/terrain-elevation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/topography/terrain-elevation/topographical-relief-maps | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/radar/radar-imagery | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:sts-99 | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| created_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| updated_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |