High Water Marks July 2024 Vermont Floods - UVM Floodplains

This dataset represents high-water mark observations made following widespread flooding in Vermont on July 10-11, 2024. Sites visited following flood recession are part of a long-term floodplain monitoring and habitat assessment 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 "Excellent" or "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2024年7月10日至11日美国佛蒙特州大范围洪水过后的高水位标记观测数据。洪水退去后开展走访的监测点位，均隶属于佛蒙特大学长期推进的河漫滩监测与栖息地评估项目。
洪水消退后不久，野外作业团队便对高水位标记点进行了标识、拍照，并通过智能手机GPS记录点位坐标。后续，测量团队携带实时动态差分全球定位系统（RTK-GPS）重返各监测点位，以获取精度更高的位置与高程数据，并通过美国国家海洋和大气管理局（NOAA）的OPUS服务完成后处理。
数据集质量依据以下标准进行标注：
1. 现场评级：基于首次现场踏勘结果，野外作业人员对高水位标记指示物的可靠程度给出置信度评分。置信度较高的点位标注为“优秀”或“良好”，置信度较低的点位则标注为“一般”或“较差”。
2. GPS质量：基于RTK-GPS测量作业的质量等级，详细说明可参阅随附的文本文件。