Workboat Passage Bathymetry Isobaths

This dataset contains isobaths of Workboat Passage near Herschel Island, Yukon, Canada. The map is intended for display purposes only. It represents a compilation of three very different datasets. The majority of information stems from from a georeferenced scanned image of the insert pertaining to Workboat Passage included in Canadian Hydrographic Service map #7661 Demarcation Bay to Phillips Bay (1986). Soundings and isobaths were digitized. Single point sonar soundings obtained with the onboard GPS and sonar system (Garmin) in 2013 were added to the dataset. Lastly, a coastline was digitized based on a Geoeye satellite image at 1:1000 scale to provide the 0 m contour. The data (i.e. points and contours) were gridded at 40 m using the "topo to raster" tool in ArcMap. This dataset resulted from contouring the raster surface with 1m contours. No corrections for sea level elevation were carried out.

本数据集包含加拿大育空地区赫歇尔岛附近工作船航道（Workboat Passage）的等深线（isobaths），其依托的地图仅用于展示用途。本数据集整合了三类完全不同的原始数据：其中绝大多数数据源自加拿大水文局（Canadian Hydrographic Service）1986年发布的第7661号地图《德马申湾至菲利普斯湾》中工作船航道插页的地理参考扫描图像，该插页内的测深数据与等深线均已完成数字化处理；此外，2013年通过机载GPS与声呐系统（Garmin）获取的单点声呐测深数据也被纳入本数据集；最后，本数据集基于1:1000比例尺的Geoeye卫星图像对海岸线进行数字化处理，以生成0米等深线。数据（即测点与等值线）通过ArcMap中的"topo to raster（地形转栅格）"工具被网格化为40米分辨率的栅格，本数据集通过对该栅格表面绘制1米间隔的等值线生成，且未进行海平面高程校正。