Or maybe I am not understanding what you mean by including the centreline in the map
Like this map DeckExtensionPlanMap -title "The Deck Extension<br>Upper Levels<br>Middle Earth Cave<br>Greenlink System" . 36-BigWednesdayPlan@MiddleEarth 36-BigWednesdayPlanCL@MiddleEarth . end map where the contributory maps look like this. map 36-BigWednesdayPlanCL -title "36-BigWednesday centreline Plan" -projection plan 36 #centreline survey endmap map 36-BigWednesdayPlan -title "36-BigWednesday Plan" -projection plan 36-BigWednesdayPlan-s1 #scraps 36-BigWednesdayPlan-s2 endmap So what it is looking like, if the contributory maps are all derived from scraps (or maps in turn derived from scraps), then the altitude range is correct. But if there is a map that is centerline derived (ie has no scraps) then the altitude minima is set to zero. One other thing. All my tests so far use survex for loop closure. I have not tried using Therion loop closure. And all my files are native Therion files - no survex imports. Bruce _____ From: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of Marco Menchise Sent: Thursday, 8 January 2015 3:05 a.m. To: List for Therion users Subject: Re: [Therion] Altitude colors range I checked and I can confirm what Bruce is saying. If you don't include centerline in map, the altitude range is correct. If you hide the centerline in the layout (leaving it in the map) the altitude range keeps starting from 0 m. Marco On Wed, Jan 7, 2015 at 2:52 PM, Footleg <drfootleg@gmail.com> wrote: I am not seeing this Bruce. I just tested with 5.3.16. My survey imports the centreline from a Survex .3d file however, so that might make a difference? Or maybe I am not understanding what you mean by including the centreline in the map. I turned off the centreline using 'symbol-hide line survey'. If I comment that out in my layout then the centreline is drawn in the map, but my altitude range still covers only the range of my scraps. Footleg On 5 January 2015 at 22:40, Bruce <bruce@tomo.co.nz> wrote: OK, the problem is not the previews or the offsets, as it occurs in the map examples below regardless of presence of previews or offsets. What does seem to control whether the altitudes start at zero meters is whether the map definition includes a survey centerline. If part of map definition includes a survey centerline, then altitudes are coloured from zero meters to survey maxima (a bug?). If map definition has no survey centerline as part of it's definition, then coloured from survey minima to survey maxima (correct behaviour). Hence I find this behaviour manifests in maps in progress, but when they are finished and I (usually) turn off the centerline maps, they correct themselves. Bruce