Whether you are working with satellite, aerial or LiDAR imagery, GCPs ensure that your project contains “Ground Truth” – the data is tied to a specific, human-verified location on earth. For example, using Quality-1 GCPs in the orthorectification process results in increased accuracy (sub-meter) and quality of our orthoimagery. Each of our GCPs is provided to the customer with all supporting metadata, context photos, accuracy reports and station diagrams. Increase accuracy and save time and money by designing your project area to coincide with archive GCPs. The global distribution of our GCPs is displayed on the interactive map above. Zoom in and click on individual points to view associated photos, stations diagrams and accuracy reports. To download the entire GCP archive (truncated) as a kml or shapefile, click below:
Access The World's Largest Commercially Available Ground Control Point Archive!
GCP Archive: Over 47,000+ Ground Control Points are Currently Available Off The Shelf
Click the button to download a KML File to load in Google Earth!
The GCPs in the CompassData archive have all passed rigorous quality-control procedures. The accuracy of the GCPs are defined as follows;
Quality-1: 1cm – 10cm horizontal accuracy, 3cm – 10cm vertical accuracy
Quality-2: 10cm – 20cm horizontal accuracy, 10cm – 20cm vertical accuracy
Quality-3: 20cm – 50cm horizontal accuracy, 20cm – 75cm vertical accuracy
Quality-4: 50cm – 70cm horizontal accuracy, 75cm – 1.25m vertical accuracy
Quality-5: 70cm – 2.5m horizontal accuracy, 1.25m – 5m vertical accuracy
RSGCP (Remotely Sensed Ground Control Points): 1m horizontal precision, 1m vertical precision. Read More on Remotely Sensed Ground Control Points.
Deliverables can be provided in both soft copy and hard copy. We can deliver in any datum or projection required, including WGS84 (G1150) (World Geographic System), ITRF2000, ITRF2008, NAD83, ETRF89 with geographical coordinates in Latitude / Longitude or projections like UTM, Lambert, and Gauss with standard elevations as height above Sea Level or Height Above Ellipsoid (HAE). To order, call us at 303-627-4058.