filters.expression

The Expression Filter applies filtering to the input point cloud based on a set of criteria on the given dimensions.

Default Embedded Stage

This stage is enabled by default

Streamable Stage

This stage supports streaming operations

Example

This example passes through all points whose Z value is in the range [0,100] and whose Classification equals 2 (corresponding to ground in LAS).

[
    "input.las",
    {
        "type":"filters.expression",
        "expression":"(Z >= 0 && Z <= 100) && Classifcation == 2"
    },
    {
        "type":"writers.las",
        "filename":"filtered.las"
    }
]

The equivalent pipeline invoked via the PDAL translate command would be

$ pdal translate -i input.las -o filtered.las -f range --filters.expression.expression="(Z >= 0 && Z <= 100) && Classifcation == 2"

Options

expression

An expression that limits points passed to a filter.