Introduction
Photogrammetry technology is gaining popularity among the user communities due to its varied advantages and applications in many fields. Photogrammetry is a part of remote sensing, which involves viewing objects stereoscopically to make accurate measurements. The word photogrammetry, like many other words got its name derived from Greek words; photo - meaning light, gramma means graphy / drawing and metry meaning measurement. Photogrammetry is defined as the art, science of obtaining reliable information through the process of recording and taking measurements from photographs.
This technology enhances vision so that objects, areas are imaged with overlap with the help of high precision metric cameras. In the recent years due to the requirements of large scale maps with more accurate height information of the buildings and terrain, Photogrammetry has become more popular and getting more popular in India. There is a need to have trained and highly skilled manpower in this emerging area. As the rate of science and technology development is going more and more faster in the field of photogrammetry, the methods and scopes of the education and training need to change and should be able to cope with the advancements. Because of the integration and development of photogrammetry with GPS, LIDAR and GIS, Photogrammetry curriculum has become a compulsory one of the professional technology.
Why Photogrammetry
We all have seen some kind of maps in our life. With these maps we are able to represent the shape of the object, place, extent and boundary of the country etc., If we could imagine these maps in three dimensional. Yes, it will be really of great use in understanding the topography of the land. We can see the Himalayan ranges with its crest and trough. We can see the Deccan plateau, the Indian ocean, the western and eastern ghats in its relative elevations. We can have a better idea on the estimating the distance between two places, volume, surface area, slope etc.,. These types of maps are possible to prepare with the Photogrammetry technique. The same types of maps are possible to prepare with conventional ground survey technique but Photogrammetry is used for the following advantages
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The ground method is a long-established process and is relatively slow and expensive
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Can be mapped at office irrespective of different weather conditions
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Less Ground work
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Cost and time effective.
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More accurate, precise 3D mapping
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Error due to slope is removed.
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Permanent record of physical features - Photo
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So verification of data at office is possible.
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Easy updation possible- contributing to ease of maintenance.
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Slope of the fields are also generated which are very valuable.