The landmark is rumored to be the “world’s largest signature.” A farmer wrote his surname in huge letters in a field that NASA researchers used to calibrate satellite cameras in 2011. In the l990s, a Texas farmer named Jimmie Luecke cleared several miles of brush on his land to spell out his last name in letters so large that they are visible in satellite photos. And … [Read more...] about Did NASA Calibrate Satellite Cameras Using Farmer’s Name Written in Field?