ABSTRACT

This research aims to provide a brief evaluation of remotely sensed estimates in representing gross primary production (GPP) over pasture in the Northeast Region of Brazil. We used GPP data measured in situ during a micrometeorological experiment performed in a pasture area located in the NEB region using the eddy covariance technique. Remotely sensed GPP was obtained through the MOD17A2H product of the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on board the Terra satellite. We concluded that the MOD17A2H product moderately represents surface-measured GPP in the studied site, highlighting the need for improvements in the quality of the remotely sensed GPP estimates over this type of ecosystem.

摘要

这项研究的目的是对代表巴西巴西东北地区牧场上的初级生产总值（GPP）的遥感估算值进行简要评估。我们使用涡流协方差技术在位于NEB区域的牧场中进行的微气象实验中使用了在现场测量的GPP数据。通过Terra卫星上的中等分辨率成像光谱仪（MODIS）传感器的MOD17A2H产品获得了遥感GPP。我们得出的结论是，MOD17A2H产品在研究站点中适度代表了经表面测量的GPP，这突出表明需要改进此类生态系统中的GPP估算值的质量。