fPAR - spectrometer - mosaic (DP3.30014.001)

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 1 km by 1 km tile, whose corners are spatially referenced to an even kilometer. Instrumentation: NEON Airborne Observation Platform (AOP) Imaging Spectrometer (NIS) - NASA/JPL AVIRIS-NG

本次提供的产品包含光合有效辐射占比（fPAR，fraction of photosynthetically active radiation）图与fPAR不确定性图，二者均为按飞行航线组织的栅格格式数据。fPAR及fPAR不确定性图由地表方向反射率反演得到，其生成过程以土壤调节植被指数（SAVI，Soil Adjusted Vegetation Index）与叶面积指数（LAI，Leaf Area Index）作为中间产物。fPAR与fPAR不确定性栅格图采用ITRF00参考基准面作为水平空间参考，并投影至通用横轴墨卡托（UTM，Universal Transverse Mercator）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比。本产品采用GeoTIFF格式分发，每个文件对应一块1km×1km的瓦片，其四角坐标均匹配整公里空间位置。仪器信息：NEON机载观测平台（AOP）成像光谱仪（NIS）——NASA/JPL AVIRIS-NG