Phenology - NDVI from AVHRR table

Low or no-cost satellite sensors and data streams utilized for land surface phenology studies¹

¹  Data sets are accessible for low- or no-cost for use in phenology research and applications (as of 1/4/2011).
²  USGS Earth Explorer: (https://earthexplorer.usgs.gov/)
³  GIMMS data set: (https://ecocast.arc.nasa.gov/data/pub/gimms/3g.v0/)
⁴  Flemish Institute for Technology Research (VITO) for SPOT Vegetation S10 products:  (http://www.spot-vegetation.com and http://free.vgt.vito.be) 
⁵  Land Processes Distributed Active Archive Center: (https://lpdaac.usgs.gov/dataset_discovery/modis/modis_products_table)
⁶  eMODIS: (https://dds.cr.usgs.gov/emodis/), Latency is approximately 15 hours for expedited data (released daily) and around 7 days for historical data.