Photo Identifiable Ground Control Points
Here is Scott Fry, new CompassData Surveyor on his first day. Oh those Station diagrams. Customers love them but it takes a special mind to visualize what a Photo identifiable ground control point looks like from the air.
Photo identifiable Ground Control Points are obtained using pre-existing features that will be visible from aerial or satellite photos, for the purpose of orthorectification, as the basis for measuring a coordinate. CompassData considers many factors when selecting a Ground Control Point location.
Another technique used by both the CompassData office as well as the field data collector is the selection of a GCP that is – and will stay – unobstructed by overhanging objects such as trees, building awnings or vehicles parked across a painted stripe.