DTM

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DTM

  1. 1. GAGANDEEP SINGH ROLL NO.- 131861 M.TECH- RS & GIS(2013-2015) NIT-Warangal
  2. 2. SET OF CONTOUR VECTORS CONTOUR LINES SUPERIMPOSED ON GRID DTM RECT. GRID OF ELEVATIONS GRID DTM TERRAIN RELIEF REPRESENTATION TRIANGULATED IRREGULAR NETWORK TIN TERRAIN RELIEF REPRESENTATION
  3. 3. DSM = (earth) surface including objects on it DTM = (earth) surface without any objects
  4. 4. DSM DEM
  5. 5. PROCESSING DATA ACQUISITION DTM ANALYSIS APPLICATION VISUALIZING
  6. 6. DIGITAL TERRAIN DATA SAMPLING SYSTEMATIC APPROACH ADAPTIVE APPRAOCH
  7. 7. GTOPO30 arcsecond resolution km Advanced Spaceborne Thermal Emission and Reflection Radiometer Terra satellite meter United States territory Shuttle Radar Topography Mission Elevation Dataset National
  8. 8. (InSAR) RADARSAT-1 TerraSAR-X SRTM
  9. 9. calculated standard error, standard deviation and sample variance from the topographic map and Google earth imagery are closer to those of the total station(ground survey) than those of the SRTM The descriptive statistics for the spot heights as presented in Table (2) clearly show the poor relationship of the SRTM data source when compared to other data sources under investigation.
  10. 10. VISUAL INSPECTION Figure.10 represents the terrain of the test site better when compared with reality. Figure.11 gives a poor surface representation of the test site Figure.12 also performs well but the differences between Figure(12) and Figure(10) may be as a result of erosion and human activities that have taken place from when the topographic map was produced. Figure(13) also performs well
  11. 11. • en.wikipedia.org/wiki/Digital_elevation_model • http://www.technion.ac.il/~dalyot/docs/Intro-DTM • http://geog.hkbu.edu.hk/geog3600 http://www.fig.net/pub/fig2011

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