[Therion] Pb with LRUD on null length and vertical shots
Xavier Pennec
Xavier.Pennec at sophia.inria.fr
Sat Dec 20 09:09:52 CET 2008
To specify the LRUD at the beginning of a leg (or when a is a sudden
change) it is usual in toporobot to make a null (or very small) length
shot (this is also usual in other survey softwares such as vtopo). The
intended behavior is the one of shot E with the therion syntax. In
therion, it seems that this does not work, since below a certain length
the shot is ploted as a vertical: in the example join, shots A and B are
ploted as shot F. The problem is that rewriting old surveys of type A as
E is quite a work prone to errors, and putting a length sufficient to
have it drawn horizontally (such as in shot D) is really changing the
measurements.
The second problem is that vertical shots are always oriented towards
the north, even though one specifies a bearing to indicate where is the
right and the left. This makes it difficult to draw directly on the xvi
file.
Is that behavior intentional or is that due to a division by zero which
is not handles correctly?
Xavier
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