When all baseline photos are chosen for the verified views, each one is marked up in studio. The ‘Control Points’, such as parapet heights, kerbing, lamp posts etc are coloured coded on each baseline photo. All ‘marked up’ baseline photos are then issued to a qualified topographical surveyor for surveying purposes.
A qualified surveyor will then visit all the viewpoint locations and gather GPS readings to generate survey data for camera position and ‘marked up’ objects within the baseline photos. These ‘control points’ allow the AVR to be verified to +/- 20mm accuracy.
The ‘control points’ were then created within the 3D program in the precise positions. All survey measurements were supplied in CAD format for use in the 3D model.