Client: Property Revolutions Ltd.
Task: 3D point cloud from aerial photo data.
Technical Direction: M. Hasler
In June 2017, we were asked by PRL to conduct an aerial survey of a local castle grounds. The scope of this project was to generate a 3D point cloud using photogrammetry of some Cambridgeshire based Castle Grounds.
In conducting the survey we began by setting five ground control points throughout the area we were mapping. Using a GNSS RTK kit we took accurate GPS readings at each of these points so that they could be referenced by the software when building the model. Once the readings were taken we took over 300 orthographic photos of the area from an altitude of 50m.
These photos were then ran through a software that recognises similarities in images and uses the EXIF data to build a 3D point cloud and mesh representation of the area.
This project was devised to test the accuracy of the point cloud produced, it took 1 day to complete and was found to have less than 2cm of error.
The model embedded below was for a different project but provides a representation of how a 3D model produced in this way can look.