This document is a thesis submitted by Gagandeep Singh for his M.Tech degree in RS & GIS from NIT Warangal in 2013-2015. It discusses various topics related to digital terrain modeling including contour lines, grid DTMs, TINs, the differences between DSMs and DEMs, data acquisition methods, processing techniques, and applications of digital terrain data. It also evaluates different data sources for terrain modeling like SRTM, topographic maps, and Google Earth imagery and assesses their accuracy through statistical analysis and visual inspection.

1. GAGANDEEP SINGH
ROLL NO.- 131861
M.TECH- RS & GIS(2013-2015)
NIT-Warangal

5. 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

6. DSM = (earth) surface including objects on it
DTM = (earth) surface without any objects

7. DSM
DEM

8. PROCESSING
DATA
ACQUISITION
DTM
ANALYSIS
APPLICATION
VISUALIZING

9. DIGITAL
TERRAIN DATA
SAMPLING
SYSTEMATIC
APPROACH
ADAPTIVE
APPRAOCH

11. GTOPO30
arcsecond resolution
km
Advanced Spaceborne Thermal Emission
and Reflection Radiometer
Terra satellite
meter
United
States territory
Shuttle Radar Topography Mission
Elevation Dataset
National

23. (InSAR)
RADARSAT-1
TerraSAR-X
SRTM

36. 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.

37. 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

40. • 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