Custom NEON AOP reflectance mosaics and maps of shade masks, canopy water content

This mosaic of visible to shortwave infrared (VSWIR) data was derived from the assignable asset NEON AOP radiance data that was collected by LBNL’s Watershed Function SFA during the summer of 2018 (DOI: 10.15485/1617204). This atmospheric correction was completed to take into account site-specific terrain variability in the 334 km2 survey area centered around Crested Butte, CO. The atmospheric correction was completed using ACORN atmospheric correction software executed on 200 x 200 pixel kernels rather than line by line in order to capture local flight altitude conditions. Manual cloud delineation removed any small shaded areas that occurred within the data collection areas. Mosaics were developed based on preference for days that were in close timing proximity to the coincident ground campaign and with mosaicing criteria that minimized the angle between the sun and the sensor to retrieve the most consistent reflectance (min_phase_refl_tiled). Finally, we generated shade masks based on the geometry between the sun angle at time of flight, the ground surface, and the sensor. Here we provide the orthomosaiced estimated reflectance data (min_phase_refl_tiled.tif), canopy water content (wtrl), estimated atmospheric water vapor (wtrv), the observational data (obs) for this particular mosaic, the estimated visibility (vis), shade masks derived from the digital surface elevation model (shade) and the digital terrain model (shade_tch) added to the canopy height model (DOI: 10.15485/1617203), and a wavelength metadata file. Each image file is provided as a GeoTiff with internal tiling and LZW compression. These data can also be found on Google Earth Engine for extraction, download, and analysis of smaller extents (Google Earth Engine data is linked in external link table).本可见光至短波红外（VSWIR）镶嵌数据集源自劳伦斯伯克利国家实验室（LBNL）流域功能科学焦点区于2018年夏季采集的可分配资产NEON AOP辐射亮度数据（DOI: 10.15485/1617204）。本次大气校正针对以科罗拉多州克雷斯特德比特为中心、面积达334 km²的调查区域内的特定地形变化开展。校正过程采用ACORN大气校正软件，以200×200像素的处理核为单元进行处理，而非逐行处理，以精准捕获局部飞行高度条件。通过人工云区勾画操作去除了数据采集区域内出现的所有小型阴影区域。镶嵌数据集的生成优先选择与同步地面调查时间间隔最接近的影像，并遵循最小化太阳与传感器夹角的镶嵌准则，以获取最为一致的反射率数据（min_phase_refl_tiled）。最终，我们基于飞行时刻的太阳角度、地表与传感器之间的几何关系生成了阴影掩膜。本次发布的数据包括：经正射校正的估计反射率数据（min_phase_refl_tiled.tif）、冠层含水量（wtrl）、估计大气水汽含量（wtrv）、本镶嵌数据集对应的观测数据（obs）、估计能见度（vis）、基于数字地表高程模型生成的阴影掩膜（shade），以及附加于冠层高度模型的数字地形模型阴影掩膜（shade_tch，DOI: 10.15485/1617203），同时还包含波长元数据文件。所有影像文件均以带内部分块与LZW压缩的GeoTiff格式提供。这些数据也可在Google Earth Engine中获取，用于小范围区域的提取、下载与分析（Google Earth Engine数据链接详见外部链接表）。