Document Title - Geoscience Australia
Document Title - Geoscience Australia
Document Title - Geoscience Australia
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Lord Howe High Resolution Grids<br />
0<br />
-500<br />
-1000<br />
Water Depth (m)<br />
-1500<br />
-2000<br />
-2500<br />
-3000<br />
EM12D<br />
EM300<br />
-3500<br />
-4000<br />
-4500<br />
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000<br />
Swath Width (m)<br />
Figure 32: Coverage versus depth for two multibeam systems.<br />
MULTIBEAM PROCESSING<br />
Prior to the Intrepid gridding operation all of the multbeam data had been extensively edited and<br />
corrected using the CARIS HIPS & SIPS processing software. Figure 33 below shows the CARIS<br />
workflow.<br />
Essentially a file describing the configuration of the various sensors (GPS antenna, motion sensor<br />
unit and transducer heads) and any biases (roll, pitch, yaw and time latency) is created so that the<br />
soundings can be located in their correct spatial positions. Measurements of the speed of sound in<br />
water and an estimate of tidal heights (determined using WXTide32 software) are made and also<br />
entered into the CARIS application.<br />
52
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