Appllications of Remote Sensing.ppt
- 2. Remote Sensing & GIS Applications Directorate Source: Jensen (2000) Application Domain
- 3. Urban & Regional Planning Mapping & updation of city/town maps Urban sprawl monitoring Town planning Facility management GIS database development Scope Lyari Express Way Section (Essa Nagri) Better decision support, planning & management Rapid information updation Infrastructure development monitoring Spatial information analysis Benefits
- 4. Examples of hydrological applications include: 揃 .wetlands mapping and monitoring, 揃 .soil moisture estimation, 揃 揃 determining snow-water equivalent, 揃 . river and lake ice monitoring, 揃 . flood mapping and monitoring, 揃 .glacier dynamics monitoring (surges, ablation) .river /delta change detection 揃 .drainage basin mapping and watershed modelling 揃 .irrigation canal leakage detection 揃 . irrigation scheduling
- 5. Landuse / Landcover Mapping Monitoring dynamic changes Urban/Rural infrastructure Waterlogging & salinity Scope Assessment of spatial distribution of land resources Infrastructure monitoring Availability of usable land Future planning for better land management for socio-economic development Benefits
- 7. Importance of remote sensing Remote Sensing allows data in locations that may be inaccessible or too large for in situ approaches Interplanetary studies are an excellent example of where remote sensing is useful Sample and return missions are expensive and difficult Apollo missions were last fully successful sample and return missions (Genesis was partially successful) Still, remote sensing was critical even in those missions to determine where best to sample Meteorological applications Probably the clearest example with the widest audience and daily impact Meteorological satellites cover large areas that are inaccessible Can cover these areas repeatedly to look for changes over time National Defense Resource Mapping
- 8. Advantages and Limitations of Remote Sensing The major advantages of remote sensing over the ground - based methods are: 1.Synoptic view: Remote sensing process facilitates the study of various features of earth's surface in their spatial relation to each other and helps to delineate the required features and phenomenon. 2.Accessibility: Remote sensing process makes it possible to gather information about the inaccessible area when it is not possible to do ground survey like in mountainous areas or foreign lands. 3.Time: Since information about a large area can be gathered quickly, the techniques save time and efforts of human beings/ or mass. 4.Multi-disciplinary applications: The data gathered by remote sensing process can be used by the users of different disciplines like, geology, forestry land use etc.
- 9. Limitations of Remote Sensing Technology 1. Since resolution of the data from LISS-III is 23.5 M the linear forest cover along roads, canals, bunds, rail of the width less than the resolution are generally not be recorded. 2. young plantations and species having less chlorophyll contents in their crown do not give proper reflectance and as a result are difficult to be interpreted correctly. 3. considerable details on ground may be obscured in areas having clouds and shadows. It is difficult to interpret such areas without the help of collateral data. 4. variation in spectral reflectance during leaf less period poses problems in interpretation. 5. gregarious occurrence of bushy vegetation, such as lantana, sugarcane etc, often poses problems in delineation of forest cover, as their reflectance is similar to that of tree canopy.