Map and Table Calculation

Predefined variable %P

Returns the position of a neighbour in the neighbourhood expression.

Syntax

Notes:

P stands for Position.
%P and NBPOS are aliases of each other. For more information, see Map Calculation : Neighbourhood operations & iterations.

Return values:

1 2 3

4 5 6

7 8 9

Usable in

MapCalc

Examples

Ridges = NBCNT8(10-Aspect#=NBPOS)

Calculate for each pixel the number of neighbour pixels for which the aspect is in the direction of the central pixel. A result of zero indicates a ridge or a flat area.