Would it be possible to add off-road vehicle tracks as an effect?
In most types of terrain, vehicles, especially heavy tracked vehicles, leave behind trails which are clearly visible from the air (unless they're carefully camouflaged).
For example:
http://lalitkumar.in/blog/wp-content...lalitkumar.jpg
https://britisharmy.files.wordpress....3-032-0082.jpg
http://l7.alamy.com/zooms/91ad69e771...red-g3c1k1.jpg
Adding track marks makes it much easier to detect ground vehicles, especially at altitude.
I'm thinking that the current "skid mark" effect for crashed aircraft could be adapted for ground vehicles.
Additionally, I'm wondering if it's possible for the wake effect for ships to be bigger, longer, and longer-lasting, especially for large ships. This makes it much easier to spot ships underway at a distance or at high altitudes.
For example:
https://upload.wikimedia.org/wikiped...-17_attack.jpg
http://blogs.c.yimg.jp/res/blog-40-e...6_m?1459450082