Satellite-derived bathymetry - Davis station, Vestfold Hills, 2012

Brief description

1. Pre-processed satellite imagery [Davis Station_Preprocessed_WV2_Shallow Water.tif]
IMPORTANT: This data cannot be shared due to licensing conditions and is provided for archival purposes only.

Worldview-2 Imagery was provided at Processing level 2A in UTM 44S projection. The following Pre-processing steps were applied:
1. Radiometric Correction: Digital Numbers converted to TOA Reflectance
2. Atmospheric Correction: Dark Object Subtraction
3. Masking: Masking of Land and Ice features using classification of accompanying PAN imagery
4. Shallow Water Masking: Deep water masked out by thresh-holding the green and yellow bands
The pre-processed data is provided as an 8-band Geotiff in UTM 44s with pixels of 2 m.

2. Satellite-derived bathymetry grid [Davis Station_SDB_utm44s_alat.tiff]
This bathymetry dataset was produced by applying the SMART-SDB model to Worldview 2 Multispectral Image acquired on 20120118 at 04:52:17Z. Multibeam bathymetry data acquired in February-March 20101 using a Kongsberg EM 3002D MBES, with vertical and horizontal accuracy of 0.38m and 1.95m respectively, was used for both calibration and validation of the SMART-SDB model. Derived data was smoothed using a low pass filter, and manually cleaned for erroneous returns (however some may still exist). A description of the methods is available in the attached reports.

Projection: UTM44S
Tidal datum: ALAT (approximate lowest astronomical tide)
Format: geotiff, ASCI xyz

Depths Derived from Satellite Imagery. For SA awareness only. Not for Navigation. Vertical Accuracy is un-assessable and should be considered worse than ZOC C. Undetected features significant to surface navigation may exist.

2. Bathymetry map (Davis Station SDB Chart_OFFICIAL.pdf)
This map shows the hydrographic chart from Davis Station overlayed with the new satellite-derived bathymetry data.

4. Python Scripts and Guide
These scripts were developed to automate extraction of satellite-derived bathymetry from the Worldview-2 imagery. Details of the scripts and how to apply them are outlined in the guide: Antarctica SDB Project How To.docx

5. Final report [AASP4392_Antarctica SDB Project_FINAL_REPORT.docx]
This report outlines the objectives, methods, results and conclusions for the satellite-derived bathymetry project (AASP4392). It has not been peer-reviewed.



1 A collaborative Australian Hydrographic Service, Geoscience Australia and Australian Antarctic Division survey on the Howard Burton acquired multibeam bathymetry data using a Kongsberg EM 3002D MBES with vertical and horizontal accuracy of 0.38m and 1.95m respectively in the nearshore waters of the Vestfold Hills in February-March 2010.
This survey is part of Australian Antarctic Project (AAP) 5093: Hydrographic Surveying and Seabed Characterisation (CI: Ursula Harris)

The data was extracted from the Australian Hydrographic Office database (20100329 Hydrographic survey) and is available at: O'Brien, P.E. (2011) Coastal seabed mapping survey, Vestfold Hills, Antarctica, February-March 2010, Ver. 2, Australian Antarctic Data Centre https://data.aad.gov.au/metadata/records/Davis_multibeam_grids)

Lineage

Progress Code: completed

Statement: Significant banding and spectral variability was encountered in the source Worldview-2 Imagery. The accuracies calculated from the validation dataset are likely to decrease in areas further away from the location of the calibration data.