This document only refers to L2 MBES data produced by processing software in the AusSeabed-preferred gsf format (see australian-multibeam-guidelines.github). The L2 MBES data contains processed, full resolution MBES data including status flags (rejected/accepted). We refer to L2 MBES data as a collection of various embedded datasets including raw and processed acoustic soundings and raw ancillary (navigation & attitude etc) datasets, used to make L2 products. L2 data formats in gsf format are strongly recommended to be provided to AusSeabed, unless this cannot be achieved for legitimate reasons.
Table 3. Preferred L2 formats.
Level | Preferred formats | Specifications | |||
Bathymetry | Backscatter | Navigation | Ancillary data |
| |
L2 | Priority 1
| Priority 1
| SBET data + RMS (for generation of TPU) | Priority 1
Priority 2
| When L2 data are provided, also include all L0 data to allow for reprocessing at any stages, if required. L2 should contain data that enable reproduction of L3. Bathymetry and Backscatter Variables: coordinates, depth (m, neg value) or intensity (dB), uncertainty, flag. Coordinate system: Geographic (GDA2020 or WGS84) Precision: Metric variables with minimum of 2 decimals; Angular variables degree decimals with minimum of 6 decimals Navigation and Ancillaries Date and time: Calendar and UTC or specify otherwise Coordinate system: Geographic WGS84 or GDA2020 with an ellipsoidal height datum |
LAS
The LAS (LASer) format is a file format designed for the interchange and archiving of lidar point cloud data. It is an open, binary format specified by the American Society for Photogrammetry and Remote Sensing (ASPRS). (see OGC website for specification - https://www.ogc.org/standards/LAS
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