Looking horizontally, obliquely, or even upward in the case of Object of interest and is typically not nadir viewing, but rather In close-range photogrammetry the sensor is often close to the These layers are produced using the orthoimagery as a backdrop, or from stereo image compilation in ArcGIS Pro. Other products can be produced such as vector GIS layers with features such as roads, buildings, hydrology, and other ground features. Orthoimages have been geometrically corrected so that the resulting image has the geometric integrity of a map, and orthomosaics are orthoimages that have been mosaicked into a single image. Imagery has perspective geometry that results in distortions that are unique to each image.
The imagery is processed to produce digital elevation data and orthomosaics. Multiple overlapping images - called stereo imagery - are collected as the sensor flies along a flight path. When the sensor is pointed straight down it is referred to as vertical or nadir imagery. In aerial photogrammetry the sensor is onboard a satellite, manned aircraft, or a drone and is usually pointed vertically down toward the ground. There are two general types of photogrammetry, aerial photogrammetry and close-range photogrammetry. The output of the photogrammetric process is often orthomosaic maps, symbolic maps, GIS layers, or three-dimensional (3D) models of real-world objects or scenes. Photogrammetry is the science of obtaining reliable measurements from photographs and digital imagery.
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