4. Photogrammetry Surveying
Photogrammetry is defined as the art, science, and technology of obtaining reliable information about physical objects and their environment through photographic images. The chapter covers historical developments, types of aerial photographs, applications, advantages, disadvantages, and technical terms essential to the field. It emphasizes the importance of photogrammetry in mapping and modeling, utilizing both traditional and modern techniques involving digital photography and LiDAR.
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What we have learnt
- Photogrammetry is a discipline that combines various technologies for obtaining, measuring, and interpreting photographic images.
- The chapter outlines critical technical terms and methods involved in aerial and terrestrial photogrammetry.
- Applications of photogrammetry extend across multiple fields such as mapping, geospatial analysis, agriculture, and medicine.
Key Concepts
- -- Photogrammetry
- The art, science, and technology of obtaining reliable information about physical objects and the environment through processes of recording, measuring, and interpreting photographic images.
- -- Vertical Aerial Photographs
- Aerial photographs taken with the camera axis positioned vertically or nearly vertically, essential for accurate measurements.
- -- Tilted Photographs
- Aerial photographs taken with the camera tilted more than 3° from the vertical, which may be classified into low and high oblique photographs.
- -- Digital Photogrammetry
- The phase of photogrammetry where digital images are processed using computer software to produce outcomes like Digital Elevation Models.
- -- LiDAR
- Light Detection and Ranging, a technology that uses laser light to measure distances and create detailed three-dimensional models of the Earth's surface.
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