I understand. Maybe 'where something is' in the sense of one map which shows the grounds plan, yes, BUT... shooting in (gps, cartesian, polar, whatever) coordinates for every object and keeping that in a database will present many other problems relating to production and maintenance costs, accuracy and usage. Land objects can have point, area and path attributes to name a few (maybe you want elevation too?!) and you want to spend how much for this capability? And rest assured, when your are gone your complex legacy will be trashed (unless you choose to hand your successor a paper map with some notes scribbled on it for which he will sing your praise)
BTW, I have in the past found some decent overhead imagery with observable tie points and warped that image into a geo rectified image usable as a geo-pdf using open source S/W - if the map thing is what you want.