ASPRS LiDAR Data Exchange Format (LAS) Feature Representation
In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Type Attributes), this format also adds format-specific attributes (Format Attributes).
Attribute Name |
Contents |
---|---|
las_type | This will always be las_point_cloud. |
las_file_creation_date | The date on which this file was created (LAS 1.1 and 1.2), or the date on which the data was collected (LAS 1.0). |
las_file_source_id | The file source ID. A value of zero is interpreted to mean that an ID has not been assigned. |
las_generating_software | Description of the generating software. |
las_gps_time_type | Specifies the meaning of GPS Time in the Point Records. Only present in LAS 1.2 or later. A value of 0 indicates that GPS time in the point record fields is GPS Week Time (the same as previous versions of LAS). A value of 1 indicates that GPS Time is standard GPS Time (satellite GPS Time) minus 1 x 109. The offset moves the time back to near zero to improve floating point resolution. |
las_project_id | A complete Globally Unique Identifier to serve as a project ID. By assigning a Project ID and using a File Source ID (defined above) every file within a project and every point within a file can be uniquely identified, globally. |
las_synthetic_returns | Specifies whether return numbers have been synthetically generated. |
las_system_identifier | A string identifying the hardware system or operation that generated the data. |
las_version | The version of the LAS file. |
las_vertical_coordsys_code | The GeoTIFF code identifying the vertical coordinate system. |
las_vertical_datum_code | The GeoTIFF code identifying the vertical datum. |
las_vertical_units_code | The GeoTIFF code identifying the units of the vertical coordinate system. |
las_zlas_rearranged_points | Specifies whether points were rearranged when applying zLAS compression. |