# windowmaximum¶

windowmaximum

Maximum cell value within a specified square neighbourhood

Result = windowmaximum(expression, windowlength)

expression
spatial ordinal, scalar
windowlength
spatial, non spatial scalar
Result
spatial expression

## Options¶

--unittrue or --unitcell

--unittrue
windowlength is measured in true length (default)
--unitcell
windowlength is measured in number of cell lengths

## Operation¶

For each cell a square window with the cell in its centre is defined by windowlength. The windowlength is the length of the window in horizontal and vertical directions. For each cell on expression, the maximum cell value within its window is determined and assigned to the corresponding cell on Result. Both cells on expression which are entirely in the window and cells which are partly in the window are considered.

## Notes¶

The cell value on windowlength should be greater than 0, else a missing value is assigned to the corresponding cell on Result.

A cell on windowlength with a missing value results in a missing value on Result at the corresponding cell. However, if a missing value on windowlength occurs in a cell in the window which is not the centre cell of the window the expression value in that cell is considered for determination of the maximum cell value in the window.

## Group¶

This operation belongs to the group of Neigbourhood operators; window operators

## Examples¶

1. • pcrcalc
binding
Result2 = Result2.map;
Expr = Expr.map;
WinLen2 = WinLen2.map;
initial
report Result2 = windowmaximum( Expr, WinLen2);

• python
Result2 = windowmaximum( Expr, WinLen2)
 Result2.map Expr.map WinLen2.map

2. • pcrcalc
binding
Result1 = Result1.map;
Expr = Expr.map;
initial
report Result1 = windowmaximum(Expr, 6);

• python