readers.hdf
The HDF reader reads data from files in the HDF5 format. You must explicitly specify a mapping of HDF datasets to PDAL dimensions using the dimensions parameter. ALL dimensions must be scalars and be of the same length. Compound types are not supported at this time.
Dynamic Plugin
This stage requires a dynamic plugin to operate
Streamable Stage
This stage supports streaming operations
Example
This example reads from the Autzen HDF example with all dimension properly mapped and then outputs a LAS file.
[
{
"type": "readers.hdf",
"filename": "test/data/hdf/autzen.h5",
"dimensions":
{
"X" : "autzen/X",
"Y" : "autzen/Y",
"Z" : "autzen/Z",
"Red" : "autzen/Red",
"Blue" : "autzen/Blue",
"Green" : "autzen/Green",
"Classification" : "autzen/Classification",
"EdgeOfFlightLine" : "autzen/EdgeOfFlightLine",
"GpsTime" : "autzen/GpsTime",
"Intensity" : "autzen/Intensity",
"NumberOfReturns" : "autzen/NumberOfReturns",
"PointSourceId" : "autzen/PointSourceId",
"ReturnNumber" : "autzen/ReturnNumber",
"ScanAngleRank" : "autzen/ScanAngleRank",
"ScanDirectionFlag" : "autzen/ScanDirectionFlag",
"UserData" : "autzen/UserData"
}
},
{
"type" : "writers.las",
"filename": "output.las",
"scale_x": 1.0e-5,
"scale_y": 1.0e-5,
"scale_z": 1.0e-5,
"offset_x": "auto",
"offset_y": "auto",
"offset_z": "auto"
}
]
Note
All dimensions must be simple numeric HDF datasets with equal lengths. Compound types, enum types, string types, etc. are not supported.
Warning
The HDF reader does not set an SRS.
Common Use Cases
A possible use case for this driver is reading NASA’s ICESat-2 data. This example reads the X, Y, and Z coordinates from the ICESat-2 ATL03 format and converts them into a LAS file.
[
{
"type": "readers.hdf",
"filename": "ATL03_20190906201911_10800413_002_01.h5",
"dimensions":
{
"X" : "gt1l/heights/lon_ph",
"Y" : "gt1l/heights/lat_ph",
"Z" : "gt1l/heights/h_ph"
}
},
{
"type" : "writers.las",
"filename": "output.las"
}
]
Options
- count
Maximum number of points to read. [Default: unlimited]
- override_srs
Spatial reference to apply to the data. Overrides any SRS in the input itself. Can be specified as a WKT, proj.4 or EPSG string. Can’t use with ‘default_srs’. [Default: none]
- default_srs
Spatial reference to apply to the data if the input does not specify one. Can be specified as a WKT, proj.4 or EPSG string. Can’t use with ‘override_srs’. [Default: none]
- dimensions
A JSON map with PDAL dimension names as the keys and HDF dataset paths as the values.