Photogrammetry is a type of surveying method that uses photographs to gather data and create maps, models, and other representations of the earth's surface and its features. It involves the use of aerial photographs, satellite images, or ground-based photographs to extract information about the shape, size, and location of objects and features in the surveyed area.

Photogrammetry uses a combination of computer algorithms, mathematical models, and image analysis techniques to process and interpret the images. The resulting information can be used to create accurate and detailed maps, 3D models, and other representations of the surveyed area.

Photogrammetry has many applications in fields such as surveying, mapping, geology, archaeology, and engineering. It is particularly useful for surveying large and difficult-to-access areas, such as mountainous regions, forests, and coastal zones.

The main advantage of photogrammetry is its ability to quickly and accurately gather large amounts of data over a wide area. It is also a cost-effective method, as it eliminates the need for field surveys and reduces the time and labor required to gather data. Additionally, photogrammetry provides a permanent record of the surveyed area, as the images can be stored and analyzed at a later date if necessary.

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