filters.range

The range filter applies rudimentary filtering to the input point cloud based on a set of criteria on the given dimensions.

Pipeline 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).

{
  "pipeline":[
    "input.las",
    {
      "type":"filters.range",
      "limits":"Z[0:100],Classification[2:2]"
    },
    {
      "type":"writers.las",
      "filename":"filtered.las"
    }
  ]
}

Command-line Example

The equivalent pipeline invoked via the PDAL translate command would be

$ pdal translate -i input.las -o filtered.las -f range --filters.range.limits="Z[0:100],Classification[2:2]"

Options

limits

A comma-separated list of Ranges. If more than one range is specified for a dimension, the criteria are treated as being logically ORed together. Ranges for different dimensions are treated as being logically ANDed.

Example:

Classification[1:2], Red[1:50], Blue[25:75], Red[75:255], Classification[6:7]

This specification will select points that have the classification of 1, 2, 6 or 7 and have a blue value or 25-75 and have a red value of 1-50 or 75-255. In this case, all values are inclusive.

Ranges

A range specification is a dimension name, followed by an optional negation character (‘!’), and a starting and ending value separated by a colon, surrounded by parentheses or square brackets. Either the starting or ending values can be omitted. Parentheses indicate an open endpoint that doesn’t include the adjacent value. Square brackets indicate a closed endpoint that includes the adjacent value.

Example 1:

Z[10:]

Selects all points with a Z value greater than or equal to 10.

Example 2:

Classification[2:2]

Selects all points with a classification of 2.

Example 3:

Red!(20:40]

Selects all points with red values less than or equal to 20 and those with values greater than 40

Example 4:

Blue[:255)

Selects all points with a blue value less than 255.

Example 5:

Intensity![25:25]

Selects all points with an intensity not equal to 25.