3.3 Landscape representation
, be denoted 
and the matrix of weights be denoted 
. We can now define the three following distances:
;
;
.
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The so-called unified matrix method [Ultsch and Siemon, 1989][Ultsch, 1993] has been proposed to combine the three distances into one matrix 
of size 
. For the column positions 
, 
and 
, and for row positions 
, 
and 
, the components of the matrix take their value as follow:
.
Mathematically, this gives:
;
;
;
.
with 
being the median[12] of the surrounding elements, thus
where 
denotes the surrounding elements arranged in increasing order of magnitude.
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