MODIS数据产品MOD17A3HGF数据的下载全过程（合成软件MRT放在文末了）

前言

1、首先介绍一下 LAADS DAAC（我主要用来下载MODIS数据）

The Level-1 and Atmosphere Archive & Distribution System Distributed Active Archive Center (LAADS DAACLAADS DAACLAADS DAAC), located in Greenbelt, MD, primarily archives and distributes data on clouds, water vapor, and aerosols in Earth’s atmosphere as well as key instrument data for NASA, NOAA and European Space Administration missions. Secondarily, LAADS DAAC serves as a backup source for Moderate Resolution Imaging Spectroradiometer (MODIS) and Visible Infrared Imaging Radiometer Suite (VIIRS) land products.