The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
S. No.
Level-1
Mode of
Feature
Extraction
Level-2
1
Communication
Line
2D (Cl &
C2)
Road with Trees
National
Highway
City Roads /
Streets
Cart Track
Railway Line
Rail under
Construction
Road Under
Construction
2
Construction
2D & 3D
Building /
Building Blocks
Houses in Rural
Area
Stadium
Aerodrome
Railway Station
Industrial area
3
Hydrography
2D (Cl
&C2)
River / Stream
permanent
River / Stream
Temporary
River with trees
Canal
Lake / Pond /
Water bodies
Permanent
Lake / Pond /
Water bodies
temporary
Barrage /
Reservoir
4
Orographie
3D (Cl)
Index Contour
Contour Normal
5
Vegetation
2D/3D
Vegetation Limit
Forest
Plantation / Trees
Table - 1: List Of features Captured from Cartosat-1 and
Cartosat-2 Orthoimages in 2D and Cartosat-1 stereo mode in
3D
Terrain (DEM) can be accurately extracted from Cartosat-1
stereo data, while the achieved accuracy of the DEM is
depending upon the pixel size, the base to height relation, the
contrast and slope of the area, but also the time interval between
imaging both scenes. On these parameters of accuracy Cartosat-
1 fits perfectly. The DEM from the Cartosat-1 data has been
generated at 10 m grid interval as shown in figure-4. The other
information content (viz- forest, vegetation, roads, lakes and
buildings) have been extracted by Cartosat-1 stereo images (3-
D feature extraction) and further supplemented by Cartosat-2
(2-D feature extraction) as in figure-5. Older maps, City/district
maps and Mobile mapping system (Palmtop & hand held GPS)
are the other sources to collect the geographic names. There is a
tremendous reduction in the ground truth data collection (field
verification) by using Cartosat-1 and Cartosat-2 datasets
together in an integrated manner. The accuracy and
morphologic information contents in both the satellites are
sufficient for most of the mapping application at the 1:25000
scales, which can further be extended to 1:10000 scales (with
the information content as shown in figure 1 (a)).
Figure-1(b) Cartosat-1 and Cartosat-2 images at 1 m
Figure-2(a) Comparison of features extracted in 2D mode (Red:
Cartosat-1 & Blue: Cartosat-2)