<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Pipeline version="1.0">
    <Writer type="writers.pgpointcloud">
        <Option name="spatialreference">EPSG:28355</Option>
        <Option name="connection">dbname='lidardb' user='lidar' host='localhost'
            port='5432' password='123'</Option>
        <Option name="table">test</Option>
        <Option name="srid">928355</Option>
        <Filter type="filters.voxelgrid">
            <Option name="leaf_x">1.0</Option>
            <Option name="leaf_y">1.0</Option>
            <Option name="leaf_z">1.0</Option>
        <Reader type="readers.las">
            <Option name="filename">run1.las</Option>
            <Option name="spatialreference">EPSG:28355</Option>
        </Reader>
        </Filter>
    </Writer>
</Pipeline>

>: pdal pipeline downsample_pipelineLAS.xml

PDAL: Couldn't create filter stage of type 'filters.voxelgrid'.

>: pdal --drivers

========================= ======================================================================================================================================
Name                      Description
========================= ======================================================================================================================================
filters.chipper           Organize points into spatially contiguous, squarish, and non-overlapping chips.
filters.colorization      Fetch and assign RGB color information from a GDAL-readable datasource.
filters.crop              Filter points inside or outside a bounding box or a polygon if PDAL was built with GEOS support.
filters.decimation        Rank decimation filter. Keep every Nth point
filters.ferry             Copy date from one dimension to another.
filters.merge             Merge data from two different readers into a single stream.
filters.mortonorder       Morton or z-order sorting of points. See http://en.wikipedia.org/wiki/Z-order_curve for more detail.
filters.range             Pass only points given a dimension/range.
filters.reprojection      Reproject data using GDAL from one coordinate system to another.
filters.sort              Sort data based on a given dimension.
filters.splitter          Split data based on a X/Y box length.
filters.stats             Compute statistics about each dimension (mean, min, max, etc.)
filters.transformation    Transform each point using a 4x4 transformation matrix
readers.bpf               "Binary Point Format" (BPF) reader support. BPF is a simple DoD and research format that is used by some sensor and processing
                          chains.
readers.faux              Faux Reader
readers.gdal              Read GDAL rasters as point clouds.
readers.ilvis2            ILVIS2 Reader
readers.las               ASPRS LAS 1.0 - 1.4 read support. LASzip support is also enabled through this driver if LASzip was found during compilation.
readers.optech            Optech reader support.
readers.pgpointcloud      Read data from pgpointcloud format. "query" option needs to be a SQL statment selecting the data.
readers.ply               Read ply files.
readers.qfit              QFIT Reader
readers.sbet              SBET Reader
readers.terrasolid        TerraSolid Reader
readers.tindex            TileIndex Reader
writers.bpf               "Binary Point Format" (BPF) writer support. BPF is a simple DoD and research format that is used by some sensor and processing
                          chains.
writers.derivative        Derivative writer
writers.las               ASPRS LAS 1.0 - 1.4 writer. LASzip support is also available if enabled at compile-time. Note that LAZ does not provide LAS 1.4
                          support at this time.
writers.null              Null writer. Provides a sink for points in a pipeline. It's the same as sending pipeline output to /dev/null.
writers.pgpointcloud      Write points to PostgreSQL pgpointcloud output
writers.ply               ply writer
writers.sbet              SBET Writer
writers.text              Text Writer
========================= ======================================================================================================================================

>: pdal --version
----------------------------------------------------------------------------------------------------------------------------------------------------------------
pdal 1.1.0 (git-version: Release)