Beach profile data for the Elwha River Delta, 2020-07-22

Shoreline topography data were collected using GNSS survey methods, with a differential GPS, typically an AshTech ProMark 200 RTK-DGPS system connected to the Washington State...

岸线地形数据采用全球导航卫星系统（GNSS）测量方法采集，所使用的差分GPS（DGPS）设备通常为AshTech ProMark 200实时动态差分GPS（RTK-DGPS）系统，该系统连接至华盛顿州（原文后续内容未完整提供）。