Satellite-derived bathymetry – Mawson station, Holme Bay, 2017

• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY; BATHYMETRY > COASTAL BATHYMETRY; WATER DEPTH; MULTISPECTRAL IMAGE; PYTHON; CAMERAS; WORLDVIEW-2 > DigitalGlobe WORLDVIEW-2; AMD/AU; AMD; CEOS; CONTINENT > ANTARCTICA > MAWSON STATION; HOLME BAY; GEOGRAPHIC REGION > POLAR; Mawson Station; Holme; Holme Bay; Antarc*; Antarctica
• Online Access: https://researchdata.edu.au/satellite-derived-bathymetry-bay-2017/2823249

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. 1. Pre-processed satellite imagery [Mawson 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 GCS WG84. 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 wg84 with pixels of 0.000018° 2. Satellite-derived bathymetry grid [Mawson Station_SDB_wg84_alat.tiff] This bathymetry dataset was produced by applying the SMART-SDB model to Worldview 2 Multispectral Image acquired on 20170129 at 05:21:13Z. Singlebeam bathymetry data acquired in February 20191 using a CEESCOPE 200kHz SBES with CMAX SSS, with vertical and horizontal accuracy of 0.50m and 3.00m 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: GCS WG84 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. 3. Bathymetry map (Mawson Station SDB Chart_OFFICIAL.pdf) This map shows the ...