Gravimetric (Caldari, Blue).
Magnetometric (Gallente, Green).
Radar (Amarr, Yellow).
Ladar (Minmatar, Red).
Multispectrum (Non-racial).

Anomalies are ranked in difficulty by 10 levels, these are:
* (Faction) Burrow / Drone Collection (lowest)
* (Faction) Hideaway / Drone Cluster
* (Faction) Refuge / Drone Gathering
* (Faction) Den / Drone Gathering
* (Faction) Yard / Drone Surveillance
* (Faction) Rally Point / Drone Menagerie
* (Faction) Port / Drone Herd
* (Faction) Hub / Drone Squad
* (Faction) Haven / Drone Patrol
* (Faction) Sanctum / Drone Horde (hardest)

http://kos.cva-eve.org/