Beach profile data for the Elwha River Delta, 2019-01-20

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，所用设备为差分GPS，通常为与华盛顿州……相连的阿什泰克ProMark 200实时动态差分GPS（RTK-DGPS）系统。