High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

Area covered by one scene = 420 sq. km
No. of scene (including overlaps)
Geo-referencing, DEM generation &
= 7440 Nos. (Approx.)
Ortho photo generation = Two days per scene
Ortho mosaicing as per Sheet layout = One day per scene
Total of 1270 man months are required to complete the task. By using 140
photogrammetric workstations in double shifts, this task can be completed in 5
months time.
6. Feature Extraction and Database Generation
Feature extraction for 1:10 K mapping will be done from ortho rectified images
It is proposed to carry out feature extraction in PPP mode. Feature extraction is a
systematic collection of all details appearing on ground which are also visible on the
ortho rectified imagery by digitization into vector form, i.e. conversion of data from
raster to vector. The work is targeted for completion in 2 years i.e. 2008-9 to 2010-
11. Feature extraction will be carried out as per the standards set by Survey of India
as Survey of India is responsible for the Quality Control and Standardization of the
entire data base. Features will be extracted from ortho images to create Digital
topographical data base as per the data model list is enclosed. Feature Extraction in
restricted areas will be carried out in Survey of India premises. The feature
extractions in un-restricted areas will be carried out at the vendor’s site. Guidelines
for 2D feature extraction can be worked out.
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