To plan and license a new fdd band plan licensed point to point microwave link you need to first be able to verify the frequencies you want to use are available on a given azimuth and elevation (from the aim direction of the antennas at both ends) and won't conflict with a pre existing licensee. Which means you need data on everything licensed in the area and where it is, how it's aimed, what kind of antenna and gain it has.

There's also business and market analysis purposes like knowing what corporate entity has which equipment on top of which tall office towers in a major metro area, and where their links go.