.... how hard could it be to map all aerodromes and helipads in a simple graphic ( not unlike marine zones) and say, good here, bad here....
I love the idea, and can see the thought behind it, and it would be fantastic, but I suspect far too complex, and far too inaccurate to be a lot of use... perhaps local model shops could do it for their local area, just as a very rough guide for their customers (complete with disclaimer at the bottom saying it is intended only as a guide and it's the flyer's responsibility.. blah... blah... blah...
However, to do it at any greater scale than that may be impractical
For an example, my local town has a major airport - that would be easy to do with a simple graphic, and several hospitals with heliports, those would be expected to be there and easy to add to the graphic - but I live in Australia and use the OzRunways app (there's probably an equivalent for your area if you don't live in Australia) and when I look on
that, I find heaps of
hidden heliports that I never knew were there - even a nearby doctor's surgery has a heliport which I guess is just there for use in emergencies, but I certainly had no idea it was there, I've never seen it used, or heard of it being used, but for a simplified graphic I guess it would need to be included in the "bad here." So basically, my entire city would have to be listed as "bad here" which I know isn't strictly the case, but in a simplified graphic they'd have to err on the side of caution and include
every known heliport as "bad."
When I zoom in on the OzRunways app, then just place two fingers on the screen, it gives me the distance between the two points, so I can zoom in on the map to find those small areas between the heliports and measure out whether I'm good to fly there based on the distance to the heliport. Some gaps between the heliports would be too small to realistically show on the simplified graphic, but as a general guide done for customers, it would possibly be feasible and even appreciated, but for someone to do a whole country, or even just the major areas of a country, it would be prohibitively expensive, and impractical.