2006_2009_MODIS_Phenology

This dataset supercedes the previousl MODIS Phenology datasets based on MODIS V4 data  lebelled 'Green up' and 'senescence'.A number of coverages have been processed and extracted from the global MODIS Land Cover Dynamics datasets derived by Boston University (http://www.bu.edu/lcsc/research/land-cover-dynamics) from the NASA MOD12Q2 MODIS tiled phenology layers (https://lpdaac.usgs.gov/products/modis_products_table/mcd12q2). A detailed user guide (http://www.bu.edu/lcsc/files/2012/08/MCD12Q2_UserGuide.pdf, and http://modis.gsfc.nasa.gov/data/atbd/atbd_mod12.pdf) has been released by the Boston University team which provides detailed technical specifications and describes the methods used to calculate the layer values.In summary, these datasets for version 5  were produced twice a year (January and June) between 2001 and early 2010. For each date, a series of parameters were calculated of which five are provided here for 2006 to 2010:  Green Up  and  Senescence , which represent the dates when new green vegetation started be detected at the beginning of a growth cycle, and when the fall in greenness stopped at the end of the cycle.Because some areas have more than once cycle a year, two images are produced for each date:  Cycle 1  and  Cycle2 . Thus, the Cycle 1 green up image for January 2006 contains the date (expressed as days from January 1 2000) of the green up event for the first cycle occurring between the end of June 2005 and the beginning of July 2006, whilst the Cycle 2 image contains the date for the green up event of the second cycle occurring in that period.This can be confusing, for a detailed explanation with examples please refer to the document included within this download "MODIS PHENOLOGY DATA DESCRIPTION_v2.doc".