RuDTM2014: New digital terrain model for Russia and its effect on the prediction of mean gravity anomalies
20/09/2016 | 17:15 | Session 3: Local/regional geoid determination methods and models
Author(s): Ilya Oshchepkov
"A new digital terrain model for Russia and surrounding area (16° < lon < 195°, 37° < lat < 82°) was created from two different datasets. The main source was the Digital Elevation Model (DEM) from digitized topographic 1:100 000 scale maps with a resolution of 1 arcsec and the second source was the DEM obtained from the Shuttle Radar Topography Mission (SRTM) with a resolution of 3 arcsec. The final RuDTM2014 has a resolution of 1 arcsec and obtained by filling the gaps in the topographic maps by the SRTM.
The sources and the final RuDTM2014 were compared with the normal heights of more than 100 000 points of the classical astro-geodetic network and with over 5000 GNSS-levelling benchmarks with both known geodetic and normal heights. Both comparisons are independent, but showed good agreement with each other.
Gravity reductions, such as atmospheric correction, the Bouguer reduction and terrain correction, were calculated from the final RuDTM2014 with the different resolutions from 1 arcsec to 5 arcmin. All results were used to calculate mean gravity anomalies for Russia which were compared with point data. The best gridding result will be used to calculate quasigeoid heights."