# filters.groupby

The Groupby Filter takes a single `PointView` as its input and creates a `PointView` for each category in the named dimension as its output.

Default Embedded Stage

This stage is enabled by default

## Example

The following pipeline will create a set of LAS files, where each file contains only points of a single `Classification`.

    [
        "input.las",
        {
            "type":"filters.groupby",
            "dimension":"Classification"
        },
        "output_#.las"
    ]

## Options

dimension

  The dimension containing data to be grouped.

where

  An expression that limits points passed to a filter. Points that don’t pass the expression skip the stage but are available to subsequent stages in a pipeline. [Default: no filtering]

where_merge

  A strategy for merging points skipped by a ‘where’ option when running in standard mode. If `true`, the skipped points are added to the first point view returned by the skipped filter. If `false`, skipped points are placed in their own point view. If `auto`, skipped points are merged into the returned point view provided that only one point view is returned and it has the same point count as it did when the filter was run. [Default: `auto`]