Photogrammetry


The practice of determining the geometric properties of objects from photographic images, output is typically a map, drawing or 3D model.

Photogrammetry:

Most commonly used to create topographic maps for the Ordnance Survey, photogrammetry is the practice of using photographic images of physical objects to obtain information. In survey practice photogrammetry is typically used to record information concerning land, buildings or structures to create 3D data which in turn can be used for whatever the client requires. The data output can range from a 2D building elevation to a full photo-realistic rendered model and are normally instructed by engineers, architects, planners, and anyone needing precise maps of an area or feature.

One of the main benefits of photogrammetry over other survey types is the ability to add detail to the survey without the need to re-visit site. The use of UAV technology i.e. remote control helicopters and airplanes allows us to map large areas very quickly. We then use software such as Pix4D MapperPRO, Agisoft's PhotoScan and EOS System's PhotoModeller to create maps, point clouds and CAD models to a very high accuracy.

The benefits of Photogrammetry:
  • The photographs offer an archive of data for future use
  • Large areas can be covered in a short period of time
  • The use of GNSS(RTK GPS) Ground Control Points (GCP's) allows for very high accuracy
  • Ideal for recording detail of a complex nature
  • The use of digital data ensures total flexibility
  • The level of detail to be extracted can be decided by the client or ourselves
  • Detail can be added without the need to return to site
  • Offer a 3D representation of items and landmarks that may have changed over time
Examples of Photogrammetry