ECCOE 2023 Surface Reflectance Validation Dataset

Scientists and engineers from the U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) Cal/Val Center of Excellence (ECCOE) collected in situ measurements using field spectrometers to support the validation of surface reflectance products derived from Earth observing remote sensing imagery. Data provided in this data release were collected during select Earth observing satellite overpasses during the months of May through November 2023 at the USGS EROS facility in Minnehaha County, South Dakota. Each field collection file includes the calculated surface reflectance of each wavelength collected using a dual field spectrometer methodology. The dual field spectrometer methodology allows for the calculated surface reflectance of each wavelength to be computed using one or both of the spectrometers. The use of the dual field spectrometers system reduces uncertainty in the field measurements by accounting for changes in solar irradiance. Both single and dual spectrometer calculated surface reflectance are included with this dataset. The differing methodologies of the calculated surface reflectance data are denoted as "Single Spectrometer" and "Dual Spectrometer". Field spectrometer data are provided as Comma Separated Values (CSV) files and GeoPackage files.

美国地质调查局（U.S. Geological Survey, USGS）地球资源观测与科学中心（Earth Resources Observation and Science Center, EROS）定标与验证卓越中心（Cal/Val Center of Excellence, ECCOE）的科研人员与工程师，借助野外光谱仪采集原位测量数据，用于支撑基于地球观测遥感影像反演的地表反射率产品的验证工作。本次发布的数据采集于2023年5月至11月期间，在南达科他州米尼哈县的USGS EROS设施内，选取地球观测卫星过境时段开展。每份野外采集文件包含采用双野外光谱仪方法测得的各波长地表反射率计算结果。双光谱仪方法可通过单台或两台光谱仪的数据计算得到各波长的地表反射率，该方法通过考量太阳辐照度的变化，降低了野外测量的不确定性。本数据集同时涵盖单光谱仪与双光谱仪两种计算方法得到的地表反射率数据，二者分别以"Single Spectrometer"和"Dual Spectrometer"进行标注区分。野外光谱仪数据以逗号分隔值（Comma Separated Values, CSV）文件与GeoPackage文件格式提供。