Where can I find digital elevation data from SRTM?
The NASA Shuttle Radar Topographic Mission (SRTM) has provided digital elevation data (DEMs) for over 80% of the globe. This data is currently distributed free of charge by USGS and is available for download from the National Map Seamless Data Distribution System, or the USGS FTP site.
What was the goal of the SRTM DEM?
Version 3: Elimination of the voids in the NASA SRTM DEM was the primary goal of a project under the NASA MEaSUREs (Making Earth System Data Records for Use in Research Environments) Program.
What is the resolution of SRTM void filled data?
The resolution for SRTM Void Filled data is 1 arc-second for the United States and 3 arc-seconds for global coverage.
How often does SRTM collect land surface data?
SRTM successfully collected radar data over 80% of the Earth’s land surface between 60° north and 56° south latitude with data points posted every 1 arc-second (approximately 30 meters). The level of processing and the resolution of the data will vary by SRTM data set.
What are no data voids in SRTM 90m?
Andy Jarvis and Edward Guevara of the CIAT Agroecosystems Resilience project, Hannes Isaak Reuter (JRC-IES-LMNH) and Andy Nelson (JRC-IES-GEM) have further processed the original DEMs to fill in these no-data voids. This involved the production of vector contours and points and the re-interpolation of these derived contours back into a raster DEM.
When to use SRTM 30 as an auxiliary dem?
When no high-resolution auxiliary DEM is available, the 30 second SRTM30 DEM is used as an auxiliary for large voids. For areas with a high-resolution auxiliary DEM: The contours and points surrounding the hole and inside the hole are interpolated to produce a hydrologically sound DEM using the TOPOGRID algorithm in Arc/Info.
How many degrees are in the DEM file?
The DEM files have been mosaiced into a seamless near-global coverage (up to 60 degrees north and south), and are available for download as 5-degree x 5-degree tiles, in a geographic coordinate system – WGS84 datum.