Download MODIS Aqua NDVI data from NASA EarthData and aggregate to summertime average.
Using the earthaccess Python package, greenness measures are downloaded from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on the Aqua satellite. We calculate summertime (warm-season) averages of two vegetation indices: NDVI (Normalized Difference Vegetation Index) and EVI (Enhanced Vegetation Index) using 16-day MODIS composites. These composites provide vegetation index estimates at approximately 250‑meter spatial resolution. Suffolk County, Massachusetts is used as a demonstration area for the NASA Earth Data query, data processing, and spatial aggregation.