Photogrammetry [] are defined by ground photogrammetry photography or aerial photography and other methods intake photograph, after treatment topographic map out a job. Traditional photogrammetry definition: a photograph obtained by optical camera, processed to obtain the subject shape of the object, the size, location, characteristics and relationships of a discipline.
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Definition and task photogrammetry
Photogrammetry [] refers photogrammetry obtained through imaging studies of information processing, information extraction, and an expression of scientific results. Traditional photogrammetry definition: a photograph obtained by optical camera, processed to obtain the subject shape of the object, the size, location, characteristics and relationships of a discipline. Photogrammetry is a branch of Surveying and Mapping, and its main task is to scale topographic mapping various build digital terrain model, provide basic data for a variety of geographic information systems and land information systems. Two major problems to be solved Photogrammetry is the geometric positioning and image interpretation. Is the geometric positioning of the subject to determine the size, shape, and spatial location. The basic principles of geometric positioning stems from surveying forward intersection method, which is based on the two known sites and two known photographic photographic direction lines, three-dimensional coordinates of the intersection of these two photographic light constitutes pending ground point. Image interpretation is to determine the nature of the image corresponding to the surface features.
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Classification photogrammetry
Depending on the photogrammetric camera location photography school can be divided into ground photogrammetry, aerial photography, photogrammetric measurement and aerospace. Depending on the field of application of photogrammetry learning can be divided into non-topographic photogrammetry and topography photogrammetry two categories. Depending on the (also different historical stages) technical processing means, photogrammetry can be divided into analog photogrammetry, analytical photogrammetry and digital photogrammetry.
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Features photogrammetry
Performed on the image measurement and interpretation, the main work in the room, without touching the object itself, which rarely limit climate, geography, and other conditions affected; objective of the photographic object or target like a true reflection, information-rich, visually , one can derive a lot of the research object geometry and physical information; can shoot video instantly dynamic objects, conventional methods are difficult to achieve the completion of survey work; apply to large-scale topographic mapping, mapping, high efficiency; product forms , can produce paper topographic maps, DLG, digital elevation models, like digital photography, such as positive.
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Wikipedia Encyclopedia
Photogrammetry photogrammetry Requirements outside the industry need to be field _select_ed photographic side control points and baseline endpoints and Its plane coordinates and elevation. When the camera optical axis to maintain the level of photography Case, there are the following methods to obtain the three-dimensional image: the axis perpendicular to the baseline Photography, photography is upright; axis baseline with the left or right corner of migraine Degree of photography, such as partial to photography; axis intersects photography, to pay to photography. Others can be applied to the photographic optical axis tilt or inclination angle camera at a certain When ingested video and photographic moment for synchronous dynamic stereo image pairs. Within the industry as Figure based on the principle of optical inversion rendezvous on the ground stereo plotter, simulation Or on the analytical plotter, find the coordinates of each point on the three-dimensional model and Elevation. Mapping the terrain, elevations or sections diagrams. Ground cover around the scene and photographic presence on the scene photograph distance The scale is not so shortcomings, but the job flexible, easy to operate, the job of Piece is relatively simple, economical, suitable for hydropower construction in steep mountain ravine Mapping the region, and with the engineering geology with, the use of multi-spectral photography, Get more geological information, the system can also be measured topographic and geological geology Elevation, reducing the workload of field staff and geological surveying and mapping personnel, to mention High precision and speed. Because that does not touch the ground photogrammetry has been research The superiority of the study object. When can also be used in the construction of hydroelectric dam closure The tongue and the flow rate of water photogrammetry; the turbine blades, damaged dam dam surface Etc. photogrammetry; in the face of the hydraulic model test for erosion, siltation and flow pattern Photogrammetry, etc., as well as smoke, mist, pollution and other photographic measurements. In other sectors, such as biology, relics of ancient buildings, industry, agriculture and environmental monitoring Liu, etc., have also been widely used. T see aerial photographic survey of the aviation pole shadow visit. Aerospace aerospace vehicles Photogrammetry t to satellites, spacecraft And the space shuttle as a platform for the use of cameras, multispectral scanners and radar Etc. to obtain images of Earth and other planets. So it is also known as Air Days of remote sensing. Because access to the various spectrum from the ultraviolet to the far infrared between ground Image information (film recording) and digital information (tape recorder), ground segment Surface resolution from tens of meters to a few meters, covering the ground in a short cycle. Excellence More prominent. Such as wide coverage, large surface, easy to apply and macro control Judgment; multi-phase, multi-band, the amount of information to facilitate image synthesis, increased. Strong and extract information; searching cap cycle is short, easy to provide ground dynamic information. This technology has been widely used in resource surveys, meteorological, environmental information and 1,50000 scale topographic map revision and so on. Remote sensing can be observed from a height Ground, and a tape recording and image information so that people on the ground informed Not aware of a large number of information, which led to increased attention, and his Class knowledge and transforming nature creates new conditions. Other photogrammetry dual media and underwater photogrammetry, mainly Measurement system on the seabed maps provide measurements for underwater archeology hands and other scientific Segment. Photography method is the subject of a class object and camera were underwater; a Target class is subject underwater camera in the air, the light passes through the two imaging Different media, must be considered a view of the optical properties of each medium, medium Special problems, such as the position and shape of the quality of the interface, with the analytical method or analytical Mapping instrument for the measurement process. This method requires more complex technology, practical applications With less. shey an ng eel} ong Photography measure t (photogrammetry) photogrammetry is
remote sensing