The specifications for the survey were a combination of LINZ MB Order-1 and SB Order-1 of the major anchorage areas, shipping routes and port facilities utilised by the fishing and tourist industry throughout the Islands. This survey provided many logistical challenges not the least being the extreme weather that the islands experience on a daily basis and the islands remoteness to mainland NZ.
The survey was conducted using two vessels fitted with identical setups. The IXSURVEY owned and operated Kongsberg EM3002D MBES, integrated with an iXSea ROVINS and WADGPS was the chosen setup for the survey. The system proved its worth during the survey, handling the weather and rugged nature of the area very well whilst maintaining a MBES swath width of at least 8 x water depths. The long period swell risk of the project was removed by the use of the iXSea ROVINS ‘Smart Heave’ which removed all heave artefacts from the final dataset. Having two dual head MBES vessels on task ensured a high rate of data acquisition effort during the short weather windows.
The survey was completed in April 2011 with a large proportion of the island surveyed. Due to the remoteness of the area it is unlikely that surveys will be conducted in the area for some time. With this in mind IXSURVEY spent a few additional days on task collecting data in several investigation areas for inclusion in the final deliverables.
IXSURVEY utilised its vast experience in the Caris Suite of products including HIPS & SIPS and Caris Bathy Database for the processing and product generation. This solution provides us, with the tools necessary to both process, QC and generate the products in a seamless and efficient manner.
Sounding data and geotiffs were also displayed in a Standard Sheet, or nautical style chart series, using ESRI ARCGIS.
IXSURVEY has previously conducted other large nautical charting surveys for LINZ including Mercury Bay (2010/11), Great Barrier Island (2008/09)
and Fiordland National Park (2008).