# windowdiversity¶

windowdiversity

Number of unique values within a specified square neighbourhood

```Result = windowdiversity(expression, windowlength)
```
expression

spatial boolean, nominal, ordinal

windowlength

spatial, non spatial scalar

Result

spatial scalar

## 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 number of unique values within its window is counted. This number is 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 the window in a cell which is not the centre cell of the window the expression value in that cell is considered for determination of the number of unique values 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 = windowdiversity( Expr, WinLen2);

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

2. • pcrcalc
binding
Result3 = Result3.map;
Expr2 = Expr2.map;
initial
report Result3 = (windowdiversity(Expr2,celllength() * 1.1)) > 1;

• python
Result3 = (windowdiversity(Expr2,celllength() * 1.1)) > 1
 Result3.map Expr2.map

3. • pcrcalc
binding
Result1 = Result1.map;
Expr = Expr.map;
initial
report Result1 = windowdiversity( Expr, 6);

• python