13-12-2012, 05:23 PM
Remote Sensing, GIS and Its application
Remote Sensing.ppt (Size: 4.01 MB / Downloads: 104)
Definition
Remote sensing is the collection of information about an object without being in direct physical contact with the object.
Remote Sensing is a technology for sampling electromagnetic radiation to acquire and interpret non-immediate geospatial data from which to extract information about features, objects, and classes on the Earth's land surface, oceans, and atmosphere.
Elements involved in Remote sensing
. Energy Source or Illumination (A)
2. Radiation and the Atmosphere (B)
3. Interaction with the Object ©
4. Recording of Energy by the Sensor (D)
5. Transmission, Reception and Processing (E)
6. Interpretation and Analysis (F)
7. Application (G)
Sensor-platform characteristics
Spectral resolution = part of the EM spectrum measured
Radiometric resolution = smallest differences in energy that can be measured
Spatial resolution = smallest unit-area measured
Revisit time (temporal resolution) = time between two successive image acquisitions over the same area
National Security
-Targeting
- Disaster mapping and monitoring
-Damage assessment
-Weapons monitoring
-Homeland security
-Navigation
-Policy
Geographic Information System
An Information System that is used to input, store , retrieve, manipulate, analyze and output geographically referenced data or geospatial data, in order to support decision making for planning and management of land use, natural resources, environment, transportation, urban facilities, and other administrative records