Orthophoto
Definition
An Orthophoto, also known as an orthoimage or orthophotograph, can be defined as an aerial photograph that has been geometrically corrected or "orthorectified" in a way such that the scale is uniform. This correction means the photo has the same lack of distortion as a map. Unlike an uncorrected aerial photograph, an orthophoto can be used to measure true distance, because it is an accurate representation of the Earth's surface, having been adjusted for topographic relief, lens distortion, and camera tilt.
What is Orthophoto?
An Orthophoto is an imagery dataset, produced from aerial photographs by utilizing photogrammetric technology in which relief displacements of features have been removed. Thus, they represent an accurate 2D image of the ground surface, akin to a bird's eye view. Orthophotos provide an accurate visual record of the surface of Earth, preserving natural features and infrastructure in their geographical context.
Orthophotos are commonly utilized in Geographic Information Systems (GIS) as a map accurate background image. They can be utilized in digital form or can be printed to produce a hardcopy output. Furthermore, they can be overlaid and used in combination with other geospatial data layers (e.g., road networks, hydrology) to provides analysts a complete picture of the spatial relationships of geographic features.
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