Years of investigating unusual phenomena gives this reporter confidence is describing this seemingly innocent surveying marker as a sinister attempt to support The Invasion. The orange line is a guide for aiming a super-powerful laser-type beam (containing who-knows-what) from high above the Earth. It was applied by a scouting party from another world. Its less-than-perfectly-straight form could be the result of fratostatic inversion of magnetic fields.

Naturally, we have developed a sanitized story for public consumption.