Colour-shaded seafloor relief, Southeast Garry Island 2009, Mackenzie Delta, Beaufort Sea, offshore northern Canada

The data set is an image of colour-shaded sun-illuminated seafloor topography collected near Garry Island in the Mackenzie Delta in the Beaufort Sea in 2009 by the Geological Survey of Canada (Atlantic) (GSCA). Data were collected with a SwathPlus Interferometric Sidescan system on Geological Survey of Canada (Atlantic), Multibeam Expedition, Beaufort Explorer 2009305. These data were collected using Differential Global Positioning System (DGPS) which determines the position of the vessel with an accuracy of 3 to 5 meters. The horizontal accuracy of the swath data is variable, depending on beam angle, water depth and inaccuracies due to sound velocity profile errors. Depth readings are accurate to within 30cm in water depths less than 30m and 1% of water depth in water depths greater than 30m. To create the colour-shaded relief a depth color gradient is applied to a grey-scale image. To have more information about this process and the other image, please refer to the data file entitled: CCIN11961_20150106_Garry_Island_1m_Seafloor_Extended_Metadata_csr.xml

本数据集为2009年由加拿大地质调查局（大西洋分局）(Geological Survey of Canada (Atlantic), GSCA)在博福特海麦肯齐三角洲加里岛附近采集的经色彩渲染的模拟太阳光照海底地形影像。数据采集工作依托加拿大地质调查局（大西洋分局）“Beaufort Explorer 2009305”多波束勘探航次搭载的SwathPlus干涉式侧扫系统(SwathPlus Interferometric Sidescan system)完成。本次数据采集采用差分全球定位系统(Differential Global Positioning System, DGPS)进行船位解算，定位精度可达3至5米。条带测扫数据的水平精度存在波动，其影响因素包括波束角度、水深以及声速剖面误差引发的定位偏差。水深测量精度如下：当水深小于30米时，读数误差不超过30厘米；当水深大于30米时，读数误差为水深值的1%。为生成该色彩晕渲地形影像，研发人员将深度色彩梯度应用于灰度影像之上。如需了解该处理流程及其他相关影像的更多信息，请参阅标题为CCIN11961_20150106_Garry_Island_1m_Seafloor_Extended_Metadata_csr.xml的数据文件。