Insat Meteorological Component

The Indian National Satellite (INSAT) is a multipurpose geostationary satellite, which carries both meteorological, and communications payloads. The INSAT-1D is located at 83.5 0E and INSAT-2B is located at 93.5 0E. The VHRR (very high resolution radiometer) onboard the satellite has a visible (0.55-0.75 ^m) and infra-red (10.5-12.5 ^m) bands with resolution of 2.75 km and 11 km for INSAT-1 series, and 2 and 8 km respectively for the INSAT-2 series. The VHRR scans are taken every 3 hours on routine basis and half hourly to even less than that, for monitoring cyclones etc. One VHRR scan takes about 30 minutes to be completed and is made up of 4096 X 4096 picture elements (pixels) in case of visible channel and 1024 x 1024 pixels in case of IR channel. The meteorological component provides:

a) Round the clock, regular half-hourly synoptic images of weather systems including severe weather, cyclones, sea surface and cloud top temperatures, water bodies, snow etc. over the entire territory of India as well as adjoining land and sea areas.

b) Collection and transmission of meteorological, hydrological and oceanographic data from unattended data collection platforms.

c) Timely warning of impending disasters from cyclones and storms etc.

d) Dissemination of meteorological information including processed images of weather systems to the forecasting offices.

0 0

Post a comment