Ted Ramasola
Veteran
It states that these were around for a long time now, for recon aircraft from the cold war days.
Article in dpreview: http://www.dpreview.com/news/2013/02/18/Giant-camera-resolution-test-charts-around-the-US
Website referred in article: http://www.clui.org/newsletter/winter-2013/photo-calibration-targets
Article in dpreview: http://www.dpreview.com/news/2013/02/18/Giant-camera-resolution-test-charts-around-the-US
Website referred in article: http://www.clui.org/newsletter/winter-2013/photo-calibration-targets