RELEASE-2022

The products supplied include a fPAR (fraction of photosynthetically active radiation) map and fPAR uncertainty map, both in raster format by flight line. The fPAR and uncertainty in fPAR maps are derived from the directional surface reflectance, through the intermediate SAVI (Soil Adjusted Vegetation Index) and LAI (Leaf Area Index) products. Raster maps for fPAR and fPAR uncertainty are reported with horizontal reference to the ITRF00 datum and projected to the Universal Transverse Mercator (UTM) mapping frame. The fPAR is reported as a unit-less value which describes the fraction of absorbed radiation by plant material. The product is distributed in a GeoTIFF format with each file containing one flight line. Instrumentation: NEON Airborne Observation Platform (AOP) Imaging Spectrometer (NIS) - NASA/JPL AVIRIS-NG

本次供应的产品包含光合有效辐射分量（fraction of photosynthetically active radiation，fPAR）栅格图与fPAR不确定性栅格图，二者均按飞行航线以栅格格式存储。上述fPAR与fPAR不确定性栅格图均由方向地表反射率推导得到，推导过程以土壤调节植被指数（Soil Adjusted Vegetation Index，SAVI）与叶面积指数（Leaf Area Index，LAI）产品作为中间产物。fPAR与fPAR不确定性栅格图的水平基准采用国际地球参考框架2000（ITRF00），并投影至通用横轴墨卡托（Universal Transverse Mercator，UTM）制图坐标系。fPAR以无量纲数值表示，用于表征植物材料吸收的辐射占总辐射的比例。本产品以GeoTIFF格式分发，每个文件对应一条飞行航线。所用仪器为NEON航空观测平台（Airborne Observation Platform，AOP）成像光谱仪（NIS）——美国国家航空航天局/喷气推进实验室AVIRIS-NG。