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

free images. It may be mentioned here that a typical topographical sheet will have
information which can be broadly by identified under following heads :
1. Heights shown in the form of contours, spot heights and some time
by hill shading,
2. Surface features like broad land use/land cover such as roads,
rivers, water bodies, settlements, forests etc
3. Place names, road names, river names etc
4. Ancillary information such as projection, scale, year of survey,
authority, reference box etc.
It was decided to use the latest remote sensing data for surface features
(item 2) which is compatible with the mapping at 1;10,000 scale. The best Indian IRS
remote sensing data now available is at 2.5m from Cartosat 1 which is not the best
resolution at this scale.
Regarding the place names etc. (item 3), we have to depend on the recently
completed field work at 1:50,000 scale. The additional place names can be compiled
from different sources available in the different offices of the Survey of India. This will
help us in creating Version 1 data. Version 2 data can be developed after
conducting special field work for additional place names at a suitable time.
Regarding ancillary information (item 4), the details are generally available in the
SOI offices.
Regarding heights (item 1), we have following three options :
1. Field work with traditional and modern equipment. This method will take
several decades hence not proposed.
2. Use of air photos and PT sections developed by 1: 40,000 and 1:50,000
scale air photos for 1:25,000 scale mapping earlier. Here only about 60 per
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