Abstract
Abstract. Remote Sensing along with Geographical Information System (GIS) has been proven as a very important tools for the monitoring of the Earth resources and the detection of its temporal variations. A variety of operational National applications in the fields of Crop yield estimation , flood monitoring, forest fire detection, landslide and land cover variations were shown in the last 25 years using the Remote Sensing data. The technology has proven very useful for risk management like by mapping of flood inundated areas identifying of escape routes and for identifying the locations of temporary housing or a-posteriori evaluation of damaged areas etc. The demand and need for Remote Sensing satellite data for such applications has increased tremendously. This can be attributed to the technology adaptation and also the happening of disasters due to the global climate changes or the urbanization. However, the real-time utilization of remote sensing data for emergency situations is still a difficult task because of the lack of a dedicated system (constellation) of satellites providing a day-to-day revisit of any area on the globe. The need of the day is to provide satellite data with the shortest delay. Tasking the satellite to product dissemination to the user is to be done in few hours. Indian Remote Sensing satellites with a range of resolutions from 1 km to 1 m has been supporting disasters both National & International. In this paper, an attempt has been made to describe the expected performance and limitations of the Indian Remote Sensing Satellites available for risk management applications, as well as an analysis of future systems Cartosat-2D, 2E ,Resourcesat-2R &RISAT-1A. This paper also attempts to describe the criteria of satellite selection for programming for the purpose of risk management with a special emphasis on planning RISAT-1(SAR sensor).
Highlights
ISRO has launched several satellites with multi sensors
RISAT-1 can view the area every 2/3 days. These satellites if planned and data is made available to users in timely manner, gives lot of information to the decision makers to manage and allocate the resources
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Summary
ISRO has launched several satellites with multi sensors. Each sensor has a capability to provide the information of the surface of earth spatially and spectrally. Earth observational optical systems are passive sensors, operating in the visible spectrum (0.4μ -0.7μ) near infrared (0.8 μ to 0.9 μ) and (1.5 μ1.8μ) medium infrared. These measurements of interpretable but have the impact of the atmospheric conditions. High sensitivity to roughness and humidity allows to retrieve different physical parameters compared to the optical sensors The fact that they are “all weather” capable makes Radar sensors operational in emergency context. RISAT-1 can view the area every 2/3 days These satellites if planned and data is made available to users in timely manner, gives lot of information to the decision makers to manage and allocate the resources.
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