# Band math

Create arithmetic expressions using spectral band values available on pixel and object level.

## Parameters

### Expression

The expression to evaluate using `w[WAVE_LENGHT]`

or `b[INDEX]`

to specify which bands to use.

Standard arithmetic (`+`

,`-`

,`/`

,`*`

…) and comparison operators (`=`

,`>`

,`<`

…) as well as some mathematical expressions (…) and constant values can be used in expressions.

EXAMPLE `(w1700 / w2200) > w1200`

### Type

If the expression should be applied to Pixels or objects

**Object**Average spectrum for the object

**Pixels**Pixel values

### Min

Min value for visualization

### Max

Max value for visualization

### Smooth

Smooth prediction result using median filter kernel

**None**No Smoothing prediction.

**Low**Smoothing using median filter kernel with 5x5 pixel box

**Medium**Smoothing using median filter kernel with 10x10 pixel box

**High**Smoothing using median filter kernel with 15x15 pixel box