Headwall Photonics Nano-Hyperspec processed imagery collected from an unmanned aerial system over oyster reefs in the Bay of St. Louis near Gulfport, Mississippi from 2018-05-07 to 2018-05-11

This data comprises imagery collected from an unmanned aerial system (DJI M600 Matrice) over oyster reefs in the Bay of St. Louis near Gulfport, Mississippi from 2018-05-07 to 2018-05-11. This dataset was collected with the goal of observing water quality from a remote platform. In particular, the hyperspectral data collected to observe relevant phenomena, and is meant to be evaluated along with the MicaSense RedEdge data collected simultaneously, although that data is not required to achieve all mission goals. The imagery was collected using a Headwall Nano-Hyperspec sensor, a pushbroom hyperspectral sensor that produces a line of pixel data 640 pixels wide. These are stored in chunks of data that can contain a user-specified number of lines per hyperspectral image file. The spectral range of the imagery is from 400-1000 nm in wavelength, although the lower and upper 50 nm tend to be less accurate. The spectral resolution is approximately 2-3 nm per band, and the sensor records 270 of these bands in total. The horizontal field-of-view of this sensor is 52 degrees (4.8 mm lens). Sensor orientation is recorded by a separate GPS/inertial measurement unit (IMU) mounted to the sensor. The orientation is recorded in the "imu_gps.txt" file. Note that there are two sensors that have been used; post-July, a newer sensor with a wide-angle lens and more accurate GPS/IMU was used. Related dataset (processed multispectral) is available under GRIIDC Unique Dataset Identifier (UDI): MS.x839.000:0007 (DOI: 10.7266/n7-gcx0-4e51).本数据集包含2018年5月7日至5月11日期间，于美国密西西比州格尔夫波特附近的圣路易斯湾牡蛎礁上空，通过DJI M600 Matrice无人机系统采集的遥感影像。本次采集的核心目标为通过远程平台开展水质监测。其中，为观测相关现象所获取的高光谱数据，需与同期采集的MicaSense RedEdge多光谱数据配合开展评估，尽管完成全部任务目标并不一定需要该多光谱数据。本次成像采用Headwall Nano-Hyperspec推扫式高光谱传感器，该传感器可生成宽度为640像素的像素线数据。高光谱图像文件以数据块形式存储，每个文件可包含用户自定义行数的图像数据。该传感器的光谱波长范围为400~1000 nm，但两端各50 nm区间的测量精度相对较低；光谱分辨率约为每波段2~3 nm，总计可采集270个光谱波段。传感器的水平视场角为52°（搭配4.8 mm镜头），其姿态信息由安装于传感器本体的独立GPS/惯性测量单元（IMU，Inertial Measurement Unit）记录，并存储于`imu_gps.txt`文件中。需注意本次任务共使用两台传感器：2018年7月之后的采集环节更换为搭载广角镜头且GPS/IMU精度更高的新型传感器。相关的经处理多光谱数据集可通过GRIIDC唯一数据集标识符（UDI，Unique Dataset Identifier）MS.x839.000:0007获取，其数字对象标识符（DOI）为10.7266/n7-gcx0-4e51。