Spy Satellite Target Benchmark

Taken in the desert near Casa Grande, Arizona. These markers are located close to the RV park where we spent many winters.

The "target" is a group of concrete pads in that shape. There is a benchmark in the exact center. The operators of the spy satellites would take photos of these markers, and then check their locations against the exact positioning of the benchmark.

This is a "circle in a square" for Sunday Challenge.

Image taken with phone and processed with GIMP.