Airborne Thermal Infrared and High-resolution True-color Imagery and Longitudinal Profiles of Stream Temperatures, Upper Donner und Blitzen River Basin, Oregon, August 2020

This dataset includes georeferenced, high-resolution, airborne thermal infrared (TIR) and high-resolution true-color imagery, a polyline shapefile of the channel centerline, a polyline shapefile with TIR sample points for longitudinal stream temperature profiles, and a tabular file with longitudinal stream temperature profiles for the Donner und Blitzen River and its tributaries, Oregon. The aerial TIR surveys were conducted with a helicopter by NV5 Geospatial and are published as 17 raster mosaics in GeoTiff format with a resolution of 0.3 meters (m). The TIR mosaics contain corrected surface temperatures in degrees Celsius (C) (multiplied by 10 to create an unsigned integer pixel type). The longitudinal stream temperature profiles have temperatures in degrees C. The TIR dataset encompasses 159 kilometers of the Donner und Blitzen River and its tributaries that extends from near Frenchglen, Oregon into the basin headwaters on Steens Mountain. The TIR surveys were collected during the afternoons (13:00-17:00) of August 13, 14, and 15, 2020. The TIR surveys were calibrated using continuous temperature loggers deployed at 29 in-stream locations distributed longitudinally throughout the survey area. The true-color imagery is published as a single raster mosaic of the entire surveyed upper Donner und Blitzen River basin stream network with a resolution of 0.1 m. Channel centerlines were manually digitized within a geographic information system. Stream temperatures for longitudinal profiles were sampled using both automated and manual methods along the channel centerline from the TIR imagery. The stream temperatures were plotted versus channel distances upstream along the Donner und Blitzen River, starting from the bridge over the river near Page Springs Campground to create longitudinal stream temperature profiles, which may be used to interpret groundwater discharge patterns and to identify potential cold-water refuges.

本数据集涵盖地理参考的高分辨率机载热红外（thermal infrared, TIR）影像与高分辨率真彩色影像、河道中心线折线形状文件、用于河道纵向温度剖面的热红外采样点折线形状文件，以及俄勒冈州唐纳-布利茨河（Donner und Blitzen River）及其支流的河道纵向温度剖面表格文件。本次机载热红外测绘由NV5 Geospatial公司依托直升机开展，成果以GeoTiff格式发布为17幅影像镶嵌图，空间分辨率达0.3米。热红外镶嵌图存储经校正的地表温度数据，单位为摄氏度（℃），数据值已乘以10以生成无符号整数像素类型。纵向河道温度剖面数据的温度单位同样为摄氏度。本热红外数据集覆盖唐纳-布利茨河及其支流共计159千米的河道范围，北起俄勒冈州法国格伦附近，向南延伸至斯蒂恩斯山（Steens Mountain）的流域源头区域。热红外测绘数据采集于2020年8月13、14、15日的下午时段（13:00-17:00）。本次热红外测绘通过部署于测绘区域纵向分布的29个河道原位温度记录仪进行校准。真彩色影像以单幅镶嵌图形式发布，覆盖全部受测的上唐纳-布利茨河流域河道网络，空间分辨率为0.1米。河道中心线通过地理信息系统手动数字化获取。纵向剖面的河道温度通过自动与人工结合的方法，沿河道中心线从热红外影像中采样获取。以佩奇斯普林斯露营地附近的跨河大桥为起点，沿唐纳-布利茨河向上游推算河道距离，将河道温度与该距离关联以生成纵向温度剖面，该剖面可用于解析地下水排泄模式并识别潜在冷水庇护栖息地。