Martins example:
map CJ_layers.map CJ_1layer.map break CJ_2layer.map break CJ_3layer.map endmap
etc
I like that general concept Martin, pretty much what I was hoping to end up with, including the likes of the preview statements in the detail maps. Nice & clean. So far it will play nicely with Maps and with Atlas outputs which is the first requirement. The next challenge is to allow for the optional offsetting of parts of the map by just commenting or uncommenting a line or two. (Depending on the particular output requirement maps need to be both 'with-offsets' and 'without-offsets', but atlas are almost always better without offsets, because by default each map, by the magic of therion, gets it's own chapter and these are linked 'up & down levels' with hyperlinks). And a further challenge is how best to incorporate sections. Are they best in a separate standalone map, or are they best sprinkled over the various plan maps, and simply turned on or off in bulk with symbol-hide, dependant on scale, or individually with -visibility off? Currently my datasets are a bit chaotic in this respect. Sorry Andrew, I don't have any better ideas for intertwined caves. With a good 'map system' like what I'm looking for it should be quite easy to rearrange the details of each map as the cave discoveries progress. I'm finding the concept of where one cave starts and another stops to be quite academic and changeable. Prejudices based on which passage was discovered from which known 'cave' are often blown apart by the speleo-morphology that becomes apparent once 'most of the discoveries' are made. I do agree though, it would be nice if Therion automatically knew which part of each map to draw 'over' or 'under' based on the survey station elevations! Bruce