3.3 Landscape representation
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 of the surrounding elements, thus
where denotes the surrounding elements arranged in increasing order of magnitude.