High Water Marks July and December 2023 Vermont Floods - UVM Floodplains

This dataset represents high-water mark observations made following widespread flooding in Vermont on July 10-11 and December 18, 2023. Sites visited following flood recession are part of a long-term floodplain monitoring network maintained by the University of Vermont. Immediately after the floods, field teams flagged high water marks, took photos, and marked the locations with smart phone GPS. Subsequently a survey team revisited the sites with an RTK-GPS to more precisely capture the location and elevation and post-processed through NOAA's OPUS.

Data quality is noted based on the following:
Field Rating: Based on initial site visits. Field personnel noted their confidence level in the indicators of the high water marks. High confidence are noted as \"Good\", and lower confidence points are noted as \"Fair\" or \"Poor\"
GPS Quality: Based on RTK-GPS survey quality. More information can be found in accompanying txt file.

本数据集收录了2023年7月10日至11日及12月18日美国佛蒙特州大范围洪灾过后的洪水痕观测数据。洪退之后接受踏勘的监测点位，均隶属于佛蒙特大学维护的长期洪泛平原监测网络。洪灾发生后，现场工作组第一时间标记洪水痕、拍摄照片，并通过智能手机GPS记录点位坐标。后续，测量工作组使用实时动态差分GPS（RTK-GPS）重新踏勘所有点位，以更精准地获取点位坐标与高程信息，并通过美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）的OPUS服务完成数据后处理。

数据质量依据以下两项标准评定：
1. 现场评级：基于初次现场踏勘结果，现场工作人员会对洪水痕标识的可信度进行评分。可信度较高的标记记为"良好"，可信度较低的点位分别记为"一般"或"较差"。
2. GPS质量：基于实时动态差分GPS（RTK-GPS）测量质量，详细信息可参阅随附的文本文件。