Archipelago of Tonga

Very-High Resolution SDB Survey


EOMAP Australia, together with project partner IXSurvey, have been contracted by the Land Information New Zealand (LINZ) to map Satellite-Derived Bathymetry for Tonga, Tokelau and areas within Niue and Cook Islands. The mapping is part of the world’s first ever survey project of this scale utilising Satellite Derived Bathymetry, Airborne bathymetric Lidar and a vessel mounted multi beam echo sounder for the one project. The resulting 2m grid (horizontal resolution) SDB product is one of the largest very-high resolution SDB datasets completed worldwide. The dataset allowed LINZ to accurately position all of the islands across the survey area in a very cost-effective manner.

A total of 74 datasets from DigitalGlobe’s WorldView-2/3/4 and GeoEye have been processed, covering more than 1000 sq km with Satellite-Derived Bathymetry data. Tasking of new satellite imagery was done for sites which were covered by archived data which did not fulfil the client’s specifications. A supplementary layer, outlining vertical uncertainties for the entire, area was also provided.




Land Information New Zealand (LINZ), iXSurvey

Project Type

Satellite-Derived Bathymetry


Satellite-Derived Bathymetry, Very-High Resolution, Tonga