Photogrammetry is the science of making measurements from photos, the technique is as old as photography itself.
The process involves taking a grid of nadir photographs, these photographs require some degree of overlap so as to match common points between photos.
Once aligned measurements can be made to each pixel, which in-turn have their coordinate logged and assembled into a 3D point cloud which can then be used to extract information about the subject of the survey.
Photogrammetry was used in World War 2 for mapping vast areas of land for reconnaissance purposes, this was achieved by using a Spitfire stripped of its weapons so as to carry the weight of the cameras required.
In more recent times, the improvement in technology has led to cameras becoming smaller and lighter, and most mapping missions are now flown using a drone weighing no more than 1.5 kg.
This method of surveying can be particularly cost and time effective for mapping large areas. The deliverables are also particularly useful for recording the site as it stood on the day on the survey.
If you would like more information or to discuss a possible use case scenario, please feel free to contact us. For work examples please follow the link below.