May to July 2018 ground control points GPS coordinates of tidal marsh and tidal forest plant species to be used as ground control points in habitat mapping.

We collected field data from sites distributed in habitats along the salinity axis of the Altamaha River estuary and the Duplin River to be used as ground control points (GCP) and ground reference data for habitat mapping. GCPs for tidal marsh (salt, brackish, tidal fresh) and tidal fresh forest vegetation species were acquired. A real time kinematic (RTK) GPS survey of GPS coordinates and ground elevations for tidal marsh vegetation was carried out in May of June of 2018. A handheld GPS was used to collect GPS coordinates for tidal forest plant species in July of 2018. A total of 101 GCPs were collected in tidal habitats, with 26 in salt, 28 in brackish and 29 in tidal fresh marsh, and another 18 in tidal fresh forest. These observations will be used to create habitat maps from aerial photographs of the Altamaha River estuary, GA taken following Hurricane Irma to better understand how the storm surge affected tidal vegetation and to examine any shifts in vegetation type.

本研究沿阿尔塔马哈河河口（Altamaha River estuary）与杜普林河（Duplin River）的盐度梯度，在沿线分布的各类生境中采集野外数据，用作生境制图的地面控制点（ground control point，GCP）与地面参考数据。本次采集获取了潮汐盐沼（盐沼、半咸水沼泽、潮汐淡水沼泽）及潮汐淡水林植被物种对应的地面控制点数据。2018年5月至6月间，针对潮汐盐沼植被开展了实时动态（Real Time Kinematic，RTK）GPS测量，获取其GPS坐标与地面高程数据；2018年7月，采用手持GPS采集了潮汐森林植物物种的GPS坐标。最终在潮汐生境中共采集到101个地面控制点：盐沼26个、半咸水沼泽28个、潮汐淡水沼泽29个，另有18个位于潮汐淡水林生境中。本批观测数据将用于基于飓风艾尔玛（Hurricane Irma）过后拍摄的佐治亚州阿尔塔马哈河河口航空影像制作生境地图，以深入解析风暴潮对潮汐植被的影响，并探究植被类型的变化情况。