Delta-X: AVIRIS-NG L1B Spectral Radiance Products, MRD, Louisiana, 2021

This dataset provides Level 1B (L1B) radiance products from NASA's Airborne Visible Infrared Imaging Spectrometer- Next Generation (AVIRIS-NG) instrument acquired over the Atchafalaya and Terrebonne basins of the Mississippi River Delta, Louisiana, USA during two deployments; spring and fall of 2021. All flights were flown on a Dynamic Aviation King Air B200. There are a combined 200 total flight lines for the spring and fall 2021 deployments; spring 2021 had 75 flight lines, fall 2021 had 175 flight lines. AVIRIS-NG measures reflected radiance at 5-nanometer (nm) intervals in the visible to shortwave infrared spectral range between 380 and 2510 nm. Level 1B data are orthorectified calibrated radiance values in units of spectral radiance in which raw digital numbers (DNs) are translated to units of radiant intensity measured at the sensor. Measurements are radiometrically and geometrically calibrated and provided at approximately 5-meter spatial resolution, dependent on aircraft altitude. Additional flight line files include band information of observational geometry and illumination parameters, as well as geographic pixel locations and elevation. These L1B data are provided in ENVI file format. AVIRIS-NG Cal/Val, Level 2 and Level 3 products for the Pre-Delta-X and Delta-X missions are provided in related datasets.

本数据集提供了源自美国宇航局（NASA）航空可见光红外成像光谱仪-下一代（AVIRIS-NG）仪器于路易斯安那州密西西比河三角洲的阿查法拉亚和特雷博恩盆地所获取的Level 1B（L1B）辐射度产品。这些产品是在2021年的春季和秋季两个部署期间获得的。所有飞行均使用动态航空公司的King Air B200飞机完成。春季和秋季2021年的部署共计200条飞行航线；其中2021年春季有75条飞行航线，2021年秋季有175条飞行航线。AVIRIS-NG在可见光至短波红外光谱范围内，以5纳米（nm）的间隔测量反射辐射度，该光谱范围介于380至2510纳米之间。Level 1B数据是以光谱辐射度单位校准的正射校正辐射值，原始数字（DNs）被转换为在传感器处测量的辐射强度单位。测量数据经过辐射计量和几何校准，并以大约5米的空间分辨率提供，该分辨率取决于飞机的飞行高度。附加的飞行航线文件包括观测几何和照明参数的波段信息，以及地理像素位置和海拔。这些L1B数据以ENVI文件格式提供。与预Delta-X和Delta-X任务相关的AVIRIS-NG校准/验证、Level 2和Level 3产品在相关数据集中提供。