[Therion] Depth in the header

[Xavier Robert]

Dear all, 

I have an other question link to the depth definition with Therion. 

In the header, Therion print only the total vertical distance between the highest point and the lowest point of the cave by default. As for the point depth, lots of my co-cavers/surveyors made me the remark that it would be better if we can print the depth in the form +xx, -yy where 


    * +xx is the height of the highest point of the cave in regards to the main entrance, 
    * -yy is the height of the lowest point of the cave in regards to the main entrance, 

It also ask question depending of the data: 


    * If there are different entrances, which entrance to use? In that case, a solution will be to choose the entrance defined in the survey block with the option -entrance 
    * If there are different caves on the map, what reference point to choose ? A solution could be to choose the highest entrance. 

I tried to find Therion's variables to calcule that, but it seems that we lack an info that is the altitude of the main entrance. 

Does anyone has an idea how to do that ? 

Do I need to open a request on Github (I am not sure to be able to code that myself) ? 

Cheers, 

Xav 
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