CompassData: The World's Largest Commercially Available Ground Control Data Set
If your project requires Ground Control, look no further. CompassData provides complete global coverage, with more than 18,000 photoidentifiable Ground Control Points available right now, and more GCP being collected all the time.
The control points residing in the CompassData archive have readily viewable metadata indicating the date of collection, the positional quality, and additional supporting data including a control point sketch and photographs of the point taken during collection.
Ground Control Applications: Satellite
Satellite data is improving, but the fact is, the vast majority of satellite imagery available today requires Ground Truth to create accurate maps. Orthorectification without GCP is inherently inaccurate.
Ground Control Applications: Aerial
When planning an aerial data collection effort, a review of the available CompassData control points in the archive may allow for the use of existing control data, eliminating or reducing the need to send a survey crew into the field to target and collect control to support subsequent mapping operations.
Not all points in the archive will be usable in any given photogrammetric project, but they do provide an independent check against existing data, and can provide an excellent starting point for troubleshooting any aerial project control issues, or to provide an initial starting point for image positioning or project layout.
CompassData also provides rapid-response ground control retrieval virtually anywhere in the world at the customers' desired level of accuracy, and in a timely, cost-effective manner, to supplement GCPs from our archive for their projects.
Data from competitors won't be perfect, but it will be close. That's not good enough for CompassData's Control Freaks. We have the most accurate, precise data in the industry.
If "close enough" isn't good enough for your next project, talk to the Control Freaks - CompassData
