Now I've got a slippy map up and running for Freemap-OSM I'd like to add
contours. This is not as straightforward as for the previous Freemap-OSM
(0.0.3; non-slippy) which used pre-generated contour images, but used the UK
grid reference system for the pre-generated tiles.
Now Freemap-OSM is using purely lat/long, pre-generated tiles at given zoom
levels are, I can see, going to be very hairy to deal with.
Thus what seems to be the best option is to dynamically generate the contours
(what I used to do in Freemap and not as slow as it sounds, at least at the
zoomed-in levels where contours are most important) and cache requests.
Problem of course: this would use a lot of disc space.