Abstract
Abstract. NASADEM is a near-global elevation model that is being produced primarily by completely reprocessing the Shuttle Radar Topography Mission (SRTM) radar data and then merging it with refined ASTER GDEM elevations. The new and improved SRTM elevations in NASADEM result from better vertical control of each SRTM data swath via reference to ICESat elevations and from SRTM void reductions using advanced interferometric unwrapping algorithms. Remnant voids will be filled primarily by GDEM3, but with reduction of GDEM glitches (mostly related to clouds) and therefore with only minor need for secondary sources of fill.
Highlights
NASADEM will be NASA’s successor digital elevation model (DEM) to the currently available “Shuttle Radar Topography Mission (SRTM) Plus” (NASA SRTM Version 3), which consists of SRTM Version 2 with voids filled primarily by ASTER GDEM2 or secondarily by GMTED2010 or the (US) National Elevation Dataset (NASA JPL, 2013)
NASADEM moves forward by first taking a step back to reprocess the original SRTM radar data, using software and reference ancillary data that did not exist for the original processing, which occurred soon after the Shuttle Radar Topography Mission in 2000
Filling voids that remain in the new SRTM DEM and extension of NASADEM to higher latitudes focuses on the soon-to-beavailable GDEM3
Summary
NASADEM will be NASA’s successor digital elevation model (DEM) to the currently available “SRTM Plus” (NASA SRTM Version 3), which consists of SRTM Version 2 (the watermasked original SRTM) with voids filled primarily by ASTER GDEM2 or secondarily by GMTED2010 or the (US) National Elevation Dataset (NASA JPL, 2013). NASADEM moves forward by first taking a step back to reprocess the original SRTM radar data, using software and reference ancillary data (from ICESat) that did not exist for the original processing, which occurred soon after the Shuttle Radar Topography Mission in 2000. Filling voids that remain in the new SRTM DEM and extension of NASADEM to higher latitudes focuses on the soon-to-beavailable GDEM3. We have developed methods for post-processing improvement of GDEM3 that greatly increase its utility in NASADEM
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