What is Photogrammetry?
Photogrammetry is used in fields such as topographic mapping, architecture, engineering, manufacturing, quality control, police investigation, cultural heritage, and geology. Archaeologists use it to quickly produce plans of large or complex sites, and meteorologists use it to determine the wind speed of tornadoes when objective weather data cannot be obtained.
Although photogrammetry has been around since the birth of photography, recent years have seen a massive leap in it capabilities due to advances in technology, and ground positioning systems. With drone work it is possible to take thousands of very high quality images, each with geotag data showing orientation, height, acceleration, direction, and time the image was taken. Thus, the layered images assembled in a specific way can produce a highly accurate and powerful 3 dimensional model of your subject. From this a huge array of relevant detail can be created in the form of CAD files, maps, contours, etc.
With the use of RTK systems (OSGB1936) never before has such visual representation been so fast to produce and yet so accurate . Adding Ground Control Points (GCPs) to the 3D Model creates unprecedented accuracy to within a couple of centimetres.