Abstract. Alpine ecosystems are experiencing rapid change, as a result of warming temperatures and changes in the quantity, timing and phase of precipitation. This in turn impacts patterns and processes of ecohydrologic connectivity, vegetation productivity, and water provision to downstream regions. The fine scale heterogeneous nature of these environments makes them challenging areas to measure with traditional instrumentation, and spatiotemporally coarse satellite imagery. This paper describes the data collection, processing, accuracy assessment, and availability, of a series of ~weekly interval unmanned aerial system (UAS) surveys, flown over the Niwot Ridge Long Term Ecological Research site during the 2017 summer snowmelt season. Visible, near infrared, and thermal infrared imagery were collected. Our unique series of 5–25 cm multispectral and thermal orthomosaics provide a unique snapshot of seasonal transitions in a high alpine catchment. Weekly radiometrically calibrated Normalized Difference Vegetation Index imagery can be used to track vegetation productivity at the pixel scale through time. Thermal imagery can be used to map the movement of snow melt across and within the near subsurface, as well as identify locations where groundwater is discharging to the surface. A 10 cm digital surface model and dense point cloud are also provided for topographic analysis of the snow free surface. Data summaries, citations, and DOIs are provided in the Data Availability section. These datasets augment ongoing data collection within this heavily studied and important alpine site, and are made publicly available to facilitate wider use by the research community.

中文翻译：

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科罗拉多州尼沃特岭夏季融雪期间高山集水区的每周高分辨率多光谱和热无人机制图

摘要。由于气温变暖以及降水量、时间和阶段的变化，高山生态系统正在经历快速变化。这反过来会影响生态水文连通性、植被生产力和下游地区供水的模式和过程。这些环境的精细尺度异构性质使它们具有挑战性的区域，无法使用传统仪器和时空粗糙的卫星图像进行测量。本文描述了 2017 年夏季融雪季节期间飞越 Niwot Ridge 长期生态研究站点的一系列〜每周一次的无人机系统 (UAS) 调查的数据收集、处理、准确性评估和可用性。收集了可见光、近红外和热红外图像。我们独特的 5-25 厘米多光谱和热正射镶嵌系列提供了高山集水区季节性转变的独特快照。每周辐射校准的归一化差异植被指数图像可用于跟踪像素级随时间变化的植被生产力。热成像可用于绘制融雪在近地表下和内部的运动图，以及确定地下水排放到地表的位置。还提供了一个 10 厘米的数字表面模型和密集点云，用于无雪表面的地形分析。数据可用性部分提供了数据摘要、引文和 DOI。这些数据集增强了这个经过大量研究的重要高山站点内正在进行的数据收集，