I've been working on a captions layer for low zoom levels (z4 - z7). The results are nice, but there seems to be a projection problem. Items are being displaced vertically.
Everything is spot-on for z8-z12, but when I try to repeat the process for z4-z7 then the error is apparent. I'm guessing at the moment that the problem has always been there, but is insignificant at z8, whereas at lower zoom levels it starts to become quite noticeable. Is there anyone who is familiar with the mercator projection code in tilesgen.pl / tahproject.pm that might be able to shed some light on this problem? The problem is easy to see here: http://www.informationfreeway.org/?lat=50.917162525157984&lon=0.5942957037543497&user=80n&zoom=7&layers=B000F000T The caption layer is showing Brighton, for example, about 50 miles north of its real position. Does anyone have any ideas? 80n
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