Onondaga Creek Relative Stream Temperature Raster, Stormwater Site, July 2017

This is one of three rasters collected during summer of 2017 displaying relative stream temperature data obtained from thermal infrared images collected via a small unmanned aerial vehicle. This site was flown on July 19, 2017 at 15:30 EST. It includes 14 images with digital numbers manually adjusted in Adobe Photoshop, georeferenced, and stitched together. As this displays relative temperature, higher values (255) indicate warmer temperatures, while lower values (0) indicate cooler temperatures, but exact temperatures are not specified as the photos were digitally altered in Photoshop. This particular site visualizes the impact of stormwater from a culvert mixing with main stem stream temperatures. Drone imagery was flown with an Inspire 1, and thermal infrared imagery was collected with a Zenmuse XT Radiometric thermal camera. Altitude was 61 m AGL and camera yaw was 28 deg.本数据集为2017年夏季采集的三幅栅格数据之一，展示通过小型无人驾驶航空器（unmanned aerial vehicle, UAV）采集的热红外影像所提取的河流相对温度数据。该采集区域于2017年7月19日美国东部标准时间（Eastern Standard Time, EST）15:30完成航拍作业。数据集包含14幅影像，其数字量化值（Digital Number, DN）已通过Adobe Photoshop进行手动调整，并完成地理配准与拼接。由于本数据展示的是相对温度，因此数值越高（255）代表水温越高，数值越低（0）代表水温越低；但由于影像在Photoshop中进行了数字化调整，故无法获取精确的温度数值。 该采集区域的影像可直观展示涵洞排出的暴雨径流与干流河水混合后对河流水温的影响。 本次航拍采用悟1（Inspire 1）无人机平台，热红外影像由禅思XT辐射测温热红外相机（Zenmuse XT Radiometric thermal camera）采集。飞行高度为离地高度（Above Ground Level, AGL）61米，相机偏航角为28度。