Classification of photogrammetry

According to the distance, it can be divided into space photogrammetry, aerial photogrammetry, ground photogrammetry, close-range photogrammetry and microscopic photogrammetry.

According to the use, topographic photogrammetry can be divided into topographic photogrammetry and non-topographic photogrammetry. Topographic photogrammetry is mainly used for surveying and mapping national basic topographic industry, architecture, archaeology, geological engineering, biology and medicine and other scientific and technological issues.

According to processing methods, it can be divided into analog photogrammetry, analytical photogrammetry and digital photogrammetry. The results of analog photogrammetry can be drawn directly on the drawing table by mechanical or gear transmission, such as topographic maps or various thematic maps, and must be digitized before being input into the computer.

The results of analysis and digital photogrammetry are various forms of digital products and visual products. Digital products include digital map, digital elevation model, digital orthophotomap, survey database, geographic information system and land information system. The visualization products here include topographic maps, thematic maps, vertical and horizontal profiles, perspective views, orthophoto maps, electronic maps, animated maps and so on.

Brief introduction of photogrammetry;

Photogrammetry is to obtain the shape, size, position, characteristics and their relationship of objects by processing the photos obtained by optical cameras.

The main task of photogrammetry is to make topographic maps of various scales, establish topographic databases, provide spatial basic data for various geographic information systems, land information systems and various projects, and serve non-topographic fields, such as industry, architecture, biology, medicine and archaeology.

The traditional photogrammetry is a science and technology that uses an optical camera to take photos, and studies and determines the shape, size, position and relationship of the photographed object through the photos.

Includes acquiring the image of an object, studying the processing methods of single photo or multiple photo images including theory, equipment and technology, and the methods and equipment for outputting the measurement results in graphic or digital form. Its main task is to make topographic maps of various scales, establish topographic databases, and provide basic surveying and mapping data for GIS and various engineering applications.

Refer to the above content: Baidu Encyclopedia-Photogrammetry