Casa Grande Photogrammetric Test Range - Wikipedia
TRUTHS – UK-led space-based climate and calibration observatory | Telespazio in the UK
RS4.1 - Satellite calibration and validation - YouTube
Calibration Targets 3: China - Google Earth Blog
Satellite calibration and validation - CSIRO
Corona Satellite Calibration Targets – Adventures With Dog
Solve for X: Deciphering Calibration Marks Made for Classified Spy Missions - 99% Invisible
Solve for X: Deciphering Calibration Marks Made for Classified Spy Missions - 99% Invisible
Satellite Imagery Calibration with Proximal Sensors | Land Imaging Report Site
Casa Grande spy-satellite targets
Casa Grande spy-satellite targets
Corona Satellite Calibration Targets – Adventures With Dog
Spy Satellite Calibration Target in Casa Grande, AZ (#4) - Virtual Globetrotting
Odd patterns in Chinese desert? Spy satellite targets
Calibration/Validation Test Sites | U.S. Geological Survey
Characterization of a satellite calibration site | ONERA
Solve for X: Deciphering Calibration Marks Made for Classified Spy Missions - 99% Invisible
Ascent Aviation Services - Corona Satellite Calibration Targets Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites. - Sitting right out in the open despite their clandestine
Satellite Cal/Val – Centre for Earth Observation
Skywatching
Calibration-Validation for the SWOT Satellite: Successful Mission in Oregon
Casa Grande Photogrammetric Test Range - Wikipedia
