filters.expression

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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) && Classification == 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) && Classification == 2"

Options#

expression

An expression that limits points passed to a filter.

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