Hi Bruce, I'm happy to be a distraction in the Middle-Earth survey :-) Are you somehow approaching the end of this survey? I guess we should hope the contrary, and that the cave should always continue a bit (or rather a lot) further. Say hello to Michael for me.

Thanks for your answer, that was very helpful to better identify the problem. I'm using 5.3.15 so everything should work similarly for me. Actually offset is working properly (I did not thought of trying that) but I discovered that the behavior of preview above/below is dependent of the number of layers of maps.

My map with the preview is very similar to yours:
map Coupe300_StFrancois
title "Pous RG16 - Quartier Saint-Francois<br>Coupe 300 degrés"
      projection [elevation 300 deg]
        Coupe300_StFrancoisDepilage
        # Coupe300_StFrancoisTBP4 [0 10 m] below ## working properly if uncommented
        preview below Coupe300_StFrancoisTBP4 # here is the problem
     endmap

If I select this map (select Coupe300_StFrancois@PousRG16) in the thconfig, then I got the expected behavior as in your case (file Coupe300_StFrancois.pdf). However, this map is normally recombined with other projection maps to draw the complete elevation, as done below:
    map Coupe300
title "Pous RG16 - Coupe 300 degrés"
      projection [elevation 300 deg]
    # Here could be another map
    Coupe300_StFrancois
    endmap
Selecting this higher level map (even with no other maps included as here) does not display the preview (file Coupe300.pdf).

However it is said in the Thbook that "Preview is displayed only if the map is in the map-level level as specified by the select command. Use the revise command if you want to add maps from higher levels to the preview." And indeed, when I use "select Coupe300@PousRG16 -map-level 2" in my thconfig file, then the preview is displayed. The map-level apparently seems to have to match exactly the number of layers (-map-level 3 or more does not display it) while I would have expected that all maps up to a certain level would be shown.

I am wondering what is the underlying reason for this behavior and if anyone would have an example of the use of the "revise" command to overload the behavior (I have to admit that the revise command remains pretty obscure to me).

Xavier

Le 16/06/2014 04:11, Bruce a écrit :

Hi Xavier

Have just finished cleaning my caving gear after caving two days with Michael and others. Your message a nice distraction from the job of actually drawing the weekends surveying!

Michael has been using previews and offsets for elevation maps for some time.

I checked just now, and it is working with 5.3.15, and presume it must have been fine with 5.3.14 and earlier.

The example here includes statements like these to create the map definition;

map DeckExtensionElev290 \

-title "Middle Earth Cave Deck Extension Passages<br>Elevation looking 290 deg" \

-projection [elevation 290 deg]

preview below MiddleEarthElev290Map

DD-SandyWayElev290@MiddleEarth [-300 000 m] above

#etc

Regards

Bruce

-----Original Message-----
From: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of Xavier Pennec
Sent: Monday, 16 June 2014 9:22 a.m.
To: List for Therion users
Subject: [Therion] preview above/below in elevation maps?

Does anyone has experience with preview above/below in elevation maps?

I use it quite often in plan maps, with the expected behavior, but when

I try it in an elevation map, the "previewed" map does not appear at all

in my pdf neither with below or above. I am wondering if I missed

something in the intended behavior or if there is a bug in my layouts

(although it does not work either if I don't load them).

Thanks for your insights

Xavier

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> Senior Research Scientist / Directeur de recherche
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