as far as I understand what is needed is to search to search through a 3D LDOS 
dataset
and find the value of z, for each x and y, which corresponds to the given value 
of the LDOS.
There are many codes doing this, including mine lev00 (the Tersoff-Hamann 
method):

http://www.mth.kcl.ac.uk/~lev/codes/lev00/index.html

you can currently use only gasp generated data, however, if there is demand 
than adding siesta
and cp2k generated datasets would be a simple thing to do, give me several days

Cheers,
Lev


On 10 May 2014, at 12:24, David Nečas (Yeti) 
<[email protected]<mailto:[email protected]>> wrote:

On Sat, May 10, 2014 at 07:52:14AM +0000, José Coutinho wrote:
However, real STM usually records the
height of the tip (z-coordinate) by scanning over a constant current
isosurface over the sample. So, we need to plot z(x,y) (this is now a
2D image) so that DLOS(x,y,z)=Const.

This is something Gwyddion cannot do at present but should be reasonably
simple to implement.  Anyway, the the first step is an import module for
your volume data format.

Regards,

Yeti


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====================================
Prof. Lev Kantorovich
Department of Physics
School of Natural and Mathematical Sciences
King' s College London
The Strand, London
WC2R 2LS
U.K.
[email protected]<mailto:[email protected]>

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