I think I've read most of the tutorials etc on geoconversion, but there are still one or two things I'd like to get clear in my head. I'd be very grateful if anybody can find time to answer any of these!
1. The size of a level 9 tile appears to be roughly 1 deg x 1 deg. (The size in km obviously varies with latitude.) Is it exactly 1x1 deg, and do its boundaries coincide exactly with whole degrees of latitude and longitude? The reason I ask is that one way of avoiding masking problems is to snap to a level 9 tile in GeoConvertHelper. However, unless you know exactly where the level 9 tile is, you would have to gather images from FSET in an areas of roughly 2x2 deg to be sure of capturing one whole level 9 tile.
2. Do the boundaries of the higher level tiles coincide exactly with boundaries of lower level ones? (I assume they do.) e.g. Are there 4 level 10 tiles precisely within one level 9 tile, etc etc?
3. I assume that the higher level tiles are not visible beyond a certain height/distance, so that your computer does not have to process information that is too small for your eye/monitor/VR headset to resolve. Is that correct? Does anybody know roughly what these distances are for different levels? The reason I ask is that I shall mostly be gliding at no more than 1000 m above the ground. Could I get away with just levels 13, 14 and 15 for example? (I could determine this by experiment, but I was just wondering if anybody already knows the answer.)
4. Do the black (masked) parts of lower level tiles obscure higher level tiles that exist in the black region? Is this why masking causes such problems? However I assume you would still see the higher level tiles if you flew low enough?
5. I always set FSET to a resolution of -1 (0.25 m). This means that it would take 24 hours at the very least to gather images to cover a whole level 9 tile. An area of 0.2 x 0.2 deg (roughly 20 x 20 km) seems more reasonable time-wise. My thinking is that one way forward for me would be to set GeoCovertHelper to give me no masked images (by unticking the box). This would mean that I would only get maybe level 12 tiles and higher within a 20x20 km box, since tiles at all levels lower than 12 would be too big. They would fall partially outside the area and would therefore be masked - and hence rejected. If I wanted to extend my scenery area I could then geoconvert another neighbouring 20x20 km square with a 50% overlap with the first 20x20 km square. I could then dump all the files into the same folder and reject the duplicates. This way I ought to get complete and seamless coverage at level 12 and higher without any masking problems. Does that make sense?