Stacho I've had a wee play with colour graduation lookup feature, at least as far as altitudes go. First thing I noticed is that it does not work if the lookup is defined inside a layout. . LayoutMapThisCave.thc [89] -- unknown option -- lookup altitude -title "Altitude legend" But if I put it outside of the layout (effectively, even if not actually), inside the thconfig file (like a 'text' definition, it works just fine for altitudes. It feels to me like it should be inside a layout, to be consistent, but perhaps you have a reason? Perhaps it does not matter. The framework seems to be very flexible, allowing many pre defined lookup definitions, and works well for altitudes. I like it. If you are happy for me to do so, I will tidy up the wiki entry that I made on this topic earlier today. * As below, it seems that if an altitude range is defined, then a single altitude in the list will break the default text that Therion puts in the colour legend. I was attempting to get Therion to produce a constant colour over altitude ranges, and interpolate colours between those ranges. As below, I found that it does not work that way. lookup altitude:banded -title "Altitude legend (banded)" [105 150][] "top level" 90 75 [30 60] [] "lower level" endlookup It produces the legend below, and a map that is only partially coloured. The default legend item texts are incorrect. * Adding colours to the top and bottom improves things a little. lookup altitude:banded -title "Altitude legend (banded)" [105 150][100 0 0] "top level" 90 75 [30 60] [0 0 100] "lower level" endlookup The colour graduation is correct, but the map produced only colours the scraps that are within the 'top level' and 'lower level' altitude range. The others (60m to 105m) are uncoloured. * Adding colours to all altitudes does not improve things much. lookup altitude:banded -title "Altitude legend (banded)" [105 150][100 0 0] "top level" 90 [50 0 0] 75 [0 0 50] [30 60] [0 0 100] "lower level" endlookup The map is still uncoloured in the middle altitudes (60m to 105m). * If I leave out the 90 and 75, the result is similar, again with uncoloured scraps in the central altitude range. * Just to be sure, I attempted three bands. lookup altitude:banded -title "Altitude legend (banded)" [105 150][100 0 0] "top level" [60 105] [] "middle level" [30 60] [0 0 100] "lower level" endlookup This worked perfectly, colouring all scraps according to their altitude band. * And just to finish up, I removed the text overrides. lookup altitude:banded -title "Altitude legend (banded)" [105 150][100 0 0] [60 105] [] [30 60] [0 0 100] Endlookup Again, perfect! The default text is OK this time. Maybe tomorrow I'll see if I can break dates, maps and scraps! Regards Bruce