tf_point_cloud_metadata | HEAVY.AI Documentation

Returns metadata for one or more las or laz point cloud/LiDAR files from a local file or directory source, optionally constraining the bounding box for metadata retrieved to the lon/lat bounding box specified by the x_min, x_max, y_min, y_max arguments.

Note: specified path must be contained in global allowed-import-paths, otherwise an error will be returned.

SELECT * FROM TABLE(
    tf_point_cloud_metadata(
        path => <path>,
        [x_min => <x_min>,
        x_max => <x_max>,
        y_min => <y_min>,
        y_max => <y_max>]
    )
)

Input Arguments

Parameter	Description	Data Types
`path`	The path of the file or directory containing the las/laz file or files. Can contain globs. Path must be in `allowed-import-paths`.	TEXT ENCODING NONE
`x_min` (optional)	Min x-coordinate value for point cloud files to retrieve metadata from.	DOUBLE
`x_max` (optional)	Max x-coordinate value for point cloud files to retrieve metadata from.	DOUBLE
`y_min` (optional)	Min y-coordinate value for point cloud files to retrieve metadata from.	DOUBLE
`y_max` (optional)	Max y-coordinate value for point cloud files to retrieve metadata from.	DOUBLE

Output Columns

Name	Description	Data Types
`file_path`	Full path for the las or laz file	Column<TEXT ENCODING DICT>
`file_name`	Filename for the las or laz file	Column<TEXT ENCODING DICT>
`file_source_id`	File source id per file metadata	Column<SMALLINT>
`version_major`	LAS version major number	Column<SMALLINT>
`version_minor`	LAS version minor number	Column<SMALLINT>
`creation_year`	Data creation year	Column<SMALLINT>
`is_compressed`	Whether data is compressed, i.e. LAZ format	Column<BOOLEAN>
`num_points`	Number of points in this file	Column<BIGINT>
`num_dims`	Number of data dimensions for this file	Column<SMALLINT>
`point_len`	Not currently used	Column<SMALLINT>
`has_time`	Whether data has time value	COLUMN<BOOLEAN>
`has_color`	Whether data contains rgb color value	COLUMN<BOOLEAN>
`has_wave`	Whether data contains wave info	COLUMN<BOOLEAN>
`has_infrared`	Whether data contains infrared value	COLUMN<BOOLEAN>
`has_14_point_format`	Data adheres to 14-attribute standard	COLUMN<BOOLEAN>
`specified_utm_zone`	UTM zone of data	Column<INT>
`x_min_source`	Minimum x-coordinate in source projection	Column<DOUBLE>
`x_max_source`	Maximum x-coordinate in source projection	Column<DOUBLE>
`y_min_source`	Minimum y-coordinate in source projection	Column<DOUBLE>
`y_max_source`	Maximum y-coordinate in source projection	Column<DOUBLE>
`z_min_source`	Minimum z-coordinate in source projection	Column<DOUBLE>
`z_max_source`	Maximum z-coordinate in source projection	Column<DOUBLE>
`x_min_4326`	Minimum x-coordinate in lon/lat degrees	Column<DOUBLE>
`x_max_4326`	Maximum x-coordinate in lon/lat degrees	Column<DOUBLE>
`y_min_4326`	Minimum y-coordinate in lon/lat degrees	Column<DOUBLE>
`y_max_4326`	Maximum y-coordinate in lon/lat degrees	Column<DOUBLE>
`z_min_4326`	Minimum z-coordinate in meters above sea level (AMSL)	Column<DOUBLE>
`z_max_4326`	Maximum z-coordinate in meters above sea level (AMSL)	Column<DOUBLE>

Example

SELECT
  file_name,
  num_points,
  specified_utm_zone,
  x_min_4326,
  x_max_4326,
  y_min_4326,
  y_max_4326
FROM
  TABLE(
    tf_point_cloud_metadata(
      path => '/home/todd/data/lidar/las_files/*2010_00000*.las'
    )
  )
ORDER BY
  file_name;
  
file_name|num_points|specified_utm_zone|x_min_4326|x_max_4326|y_min_4326|y_max_4326
ARRA-CA_GoldenGate_2010_000001.las|2063102|10|-122.9943066785969|-122.9772226614453|37.97913478250298|37.99265200734278
ARRA-CA_GoldenGate_2010_000002.las|4755131|10|-122.9943056338411|-122.9772184796481|37.99265416515848|38.00617135784082
ARRA-CA_GoldenGate_2010_000003.las|4833631|10|-122.9943045883859|-122.9772142950517|38.00617351665583|38.01969067717678
ARRA-CA_GoldenGate_2010_000004.las|6518715|10|-122.9943035422309|-122.9772101076538|38.01969283699149|38.03320996534712
ARRA-CA_GoldenGate_2010_000005.las|7508919|10|-122.9943024953755|-122.9772059174526|38.03321212616189|38.04672922234828
ARRA-CA_GoldenGate_2010_000006.las|7442130|10|-122.9943014478193|-122.977201724446|38.04673138416345|38.06024844817669
ARRA-CA_GoldenGate_2010_000007.las|5610772|10|-122.9943003995618|-122.9771975286321|38.06025061099263|38.07376764282882
ARRA-CA_GoldenGate_2010_000008.las|3515095|10|-122.9942993506024|-122.9771933300088|38.07376980664591|38.08728680630115
ARRA-CA_GoldenGate_2010_000009.las|1689283|10|-122.9942898783015|-122.9771554156435|38.19544116402802|38.20895787388029