Although the current representation looks and feels like the real Viggen radar, there are inherent problems with the raytracing technology you're using: it's based on terrain's landclasses to compute the radar return, which is fine if the radar has poor resolution, but with one notorious exception: big landmarks with strong radar returns, like large metallic bridges or hangars surronding runways that are absolutely missing on your rendition. It doesn't make sense to me that I can see a small smear showing a SAM site at 30 miles, but it's impossible to detect a 1 km long metallic bridge 15 miles away. And bug reports often raised about this and that unit not shown in the radar unveil another flaw: the dependence on internal lists to show units, leaving ground traffic aside - because ED defined it as a different entity out of the generic unit class.
And I'm sorry but I'm unable to see runways - I can see the different landclass surronding the airport yes, but actual runways and taxiways no way - can anybody prove me wrong?
P.S -> Don't get me wrong, I'm not saying you have to throw your work away and start from scratch, but there are issues, important ones, that deserves attention, care and some imagination to solve, but that should not be forgotten, for realism and practicity sake.