MetroMap uses large format camera imaging systems to produce high quality and spatially accurate imagery. The cameras utilized by MetroMap include the Ultracam series of aerial cameras produced by Vexcel Imaging GmbH which has over 20 years in photogrammetric and remote sensing expertise. We also use the Visionmap A3 Edge aerial cameras produced by Rafael Advanced Defence Systems, who have a wide-ranging business in defence, homeland security and commercial mapping applications. 

MetroMap is continually updating imagery captures over capital cities, but a large number of imagery captures on MetroMap are produced by project ‘on demand’ surveys or even by speculative captures over regional areas.

MetroMap offers very generous download quotas to our customers. We are flexible on this issue and we work with our clients to achieve the best possible result. We don’t charge our clients a surcharge for every breach of download limits because we understand some months are busier than others.

MetroMap has implemented a Fair Use Policy to cover minor breaches of download limits. In the event that downloads are consistently exceeded over a period of time we will negotiate a fee based on additional costs incurred.  We do not cut off access to MetroMap if data download limits are exceeded. 

Seamless imagery has the visual appearance of a single photo, even though it may be comprised of thousands of individual ortho-rectified frames.

Seamlessness is achieved by correct acquisition procedure with respect to time of day, sun angle, absence of cloud and cloud shadow, as well as correct processing procedure, including colour balance, geometric accuracy, seamlining and orthomosaicing.

Quality Control checking and correction is needed to ensure a seamless result. While 90% of the work is automated, no fully automatic method can produce a seamless result.

The horizontal accuracy of MetroMap ortho photography is top of the range. The seamless ortho-mosaic product has been generated using a rigorous photogrammetric workflow to provide a high geometric accuracy. This enables repeat measurement over time, change detection and confidence in any type of point, line, or area measurement on the ground as compared to map coordinate systems and survey ground control.

Advanced colour balancing techniques and software ensure a radiometric seamless product.

Three and/or four-band imagery in 8bits or 16bits can be produced.

The data is free of any geometric and radiometric artefacts and has an absolute horizontal accuracy of 2 pixels RMSE.