Photogrammetry is a science of obtaining measurement from a photograph . The output of photogrammetry is typically a map, drawing or a 3d model of some real-world object or scene.
Aerial photography
Aerial photography is the acquisition of a vertical image with a specialize camera installed on board of an airplane, Airborne photography are always performed in such a manner that two consecutive photographs have a side and forward overlap. These overlaps enable a three dimensional (3D) observation of the territory, with the help of a specialized tool. The optical phenomenon, which makes it possible to see in 3D, is called the stereoscopy.
Aerial Orthophoto
An orthophoto is an undistorted aerial photograph with a completely uniform scale that allows it to function as a map. An orthophotograph can be used to measure true distances of features within the photograph. An orthophoto is an accurate representation of the Earth’ s surface. Orthophotos have the benefits of high detail, timely coverage combined with the benefits of a map including uniform scale and true geometry.
The use of photogrammetry enhances the operations of a broad range of industries, all of which benefit from increased efficiency they are:
- Mining
- Planning
- Environment and forestry
- Utilities.
National Geodetic Survey