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How accurate is SRTM data?
The Shuttle Radar Topography Mission (SRTM) Digital Terrain Elevation Data (DTED) are used with the consensus view that it has a minimum vertical accuracy of 16 m absolute error at 90% confidence (Root Mean Square Error (RMSE) of 9.73 m) world-wide.
How do I view SRTM data?
The data may be obtained through this URL: http://dds.cr.usgs.gov/srtm/ and go to the directory where both version 1 and version 2 directories may be found.
Where is SRTM data?
German Aerospace Center
The SRTM/X-SAR data may be obtained through the German Aerospace Center (DLR).
What is HGT file?
A file with the HGT file extension is a Shuttle Radar Topography Mission (SRTM) Data file. HGT files contain digital elevation models, which are 3D pictures of a surface, usually a planet, obtained during the Shuttle Radar Topography Mission (SRTM) by NASA and the National Geospatial-Intelligence Agency (NGA).
Is SRTM data free?
Free For All – Near-Global 30-meter SRTM Elevation Data.
How are elevation contours stored in srtm2osm?
Srtm2Osm stores elevation contours as OSM ways tagged with contour = elevation tag. Also, the ele tag contains the elevation of the contour (in elevation units). The nodes and ways have ID numbers starting from 9,223,372,036,854,775,807 and are decremented for each new element in order to avoid the conflict with the actual data from the OSM server.
How to convert SRTM data to OSM format?
You can also do a manual conversion to OSM format using: BBBike.org extract service offers SRTM data in OSM and PDF format for an area of your choosing, 40m or 25m contours lines. BBBike.org extract service offers SRTM data in OSM, PDF, Garmin or Osmand format for an area of your choosing, 40m or 25m contours lines.
How to specify the step size in srtm2osm?
You can specify the step size (in meters or feet, depending on the usage of -feet option) between adjacent contour lines by using -step option. Srtm2Osm stores elevation contours as OSM ways tagged with contour = elevation tag. Also, the ele tag contains the elevation of the contour (in elevation units).
How is SRTM data used in OpenStreetMap projects?
Many OpenStreetMap-based projects use SRTM data to provide topography information, relief shading, and elevation profiles for trails and routes. An example is the OpenCycleMap rendering which shows contours and relief shading derived from SRTM data.