Beach profile data for the Elwha River Delta, 2014-10-07
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Data were collected using GNSS survey methods, with a differential GPS operating in Real Time Kinematic (RTK) mode. Data from prior to 2013 were typically collected with a Magellan ProMark 3 traditional RKT-DGPS system (i.e. local base station and rover), with the base station sited on survey control markers installed in 1996, with survey control coordinates referenced to NAD83(CORS91). Starting in 2013 survey data were typically collected with an AshTech ProMark 200 RTK-DGPS system connected to the Washington State Reference Network. Survey data collected between January and November 2013 are referenced to NAD83(CORS96), and after November 2013 to NAD83(2011). […]
本数据集采用全球导航卫星系统（Global Navigation Satellite System，GNSS）测量方法采集，所用差分GPS设备工作于实时动态（Real Time Kinematic，RTK）模式。2013年之前采集的数据通常采用麦哲伦ProMark 3传统RTK-DGPS系统（即本地基准站与流动站架构）完成采集，其基准站架设于1996年布设的测量控制标志之上，测量控制坐标基准为NAD83(CORS91)。自2013年起，测量数据多采用联入华盛顿州参考站网的阿什泰克ProMark 200 RTK-DGPS系统采集。其中2013年1月至11月间采集的测量数据坐标基准为NAD83(CORS96)，2013年11月之后的数据坐标基准则为NAD83(2011)。[…]
