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Remote Sensing

GeoSpatial Training Integrating GeoSpatial and IT for Informed

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WHAT IS REMOTE SENSING?

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REMOTE SENSING Remote Sensing is the technique that is used for obtaining information about objects by analyzing the data that is collected by special instruments that do not have any physical contact with the object/s under investigation. Alternatively, it can be termed as acquiring the salient information of an object or aspect without the need to physically touch it. The technique generally makes use of aerial sensor technologies that detect or classify the objects on earth by means of electromagnetic radiations that are emitted by aircraft or satellites. The two main components of remote Sensing are “Data Capture” and “Data Analysis”. The technique is used in Geospatial Consulting Services. Remote Sensing differs from In-situ sensing, where in the instruments that are used for detection are immersed in, or are physically brought into contact with the objects of measurement. One common example of an In-situ instrument is the soil thermometer. Remote Sensing is broadly categorized into two main types: 1. Active Remote Sensing 2. Passive Remote Sensing

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REMOTE SENSING In Passive Remote Sensing passive sensors are able to detect the natural radiations that are emitted by objects and their surrounding areas. They respond to external stimuli. Reflected sunlight is the most common source of radiation that is measured by passive sensors. Charge-coupled devices, infrared and radiometers are some examples of passive sensors. As the name also suggests in Active Remote Sensing Active sensors are used to measure the radiations that are reflected back from the target bodies. They respond to internal stimuli. RADAR is a common example of active remote sensing technique. A RADAR measures the time delay between the emission and return of a radiation, based on which it calculates the location, speed and the direction of an object. Following are the application areas for Remote Sensing technology: Ocean Applications: The technique of remote Sensing can also be used to monitor ocean circulation and current system. It is also used to measure ocean temperature and the wave heights. Remote sensing can also be used to track sea ice or in cases where you want to get a better understanding of the oceans and manage ocean resources.

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Hazard Assessment Hazard Assessment: It has its importance when there is a need to track hurricanes, earthquakes, erosion, and floods and other natural disasters. The data that is given can be used to assess the effects of natural disasters. Based on the data that is obtained by Remote Sensors some strategies can be made that can be used before and after the disaster. Natural Resource Management: Monitoring landscapes, land use, mapping wetlands and to point out the wildlife habitats. The data here can be used in order to minimize the damage that urban growth imposes on the environment. Based on this we can decide the best possible ways to protect the natural resources.

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REMOTE SENSING Coastal Applications: Remote Sensing is used to monitor the changes that occur on the shoreline or even in the case of tracking sediment transport etc. The data that is obtained by Remote Sensing can also be used for coastal mapping and for preventing erosion. The complete remote sensing process can be summarized as follows: The data is captured by the Remote Sensors, such information is recorded and then analyzed by some interpretive and measurement techniques. This is done in order to provide useful information about the objects that are under investigation. The techniques are diverse and vary from the traditional methods of visual interpretation to the methods using computer processing.

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Remote Sensing