Digital elevation models (DEMs) of northern Monterey Bay, California, March 2017

This part of the data release presents digital elevation models (DEMs) derived from bathymetry and topography data of northern Monterey Bay, California collected in March 2017. Bathymetry data were collected using two personal watercraft (PWCs), each equipped with single-beam echosounders and survey-grade global navigation satellite system (GNSS) receivers. Topography data were collected on foot with GNSS receivers mounted on backpacks and with an all-terrain vehicle (ATV) using a GNSS receiver mounted at a measured height above the ground. Additional topography data were collected with a terrestrial lidar scanner. DEM surfaces were produced from all available elevation data using linear interpolation.

本次发布的数据子集包含基于2017年3月采集的美国加利福尼亚州北部蒙特雷湾水深与地形数据生成的数字高程模型（digital elevation models, DEMs）。水深数据通过两艘个人水上载具（personal watercraft, PWCs）采集，每艘载具均搭载单波束测深仪与测量级全球导航卫星系统（global navigation satellite system, GNSS）接收机。地形数据采集分为两种方式：一是将GNSS接收机搭载于背包徒步采集，二是使用搭载在地面以上标定高度处的GNSS接收机的全地形车（all-terrain vehicle, ATV）开展采集；另有补充地形数据通过地面激光雷达扫描仪采集。所有可用高程数据经线性插值（linear interpolation）处理后生成DEM表面。