My research work needs the data of MOD13A2. I know from MOD13_User_Guide_V6.pdf that the data is the VI average value of a period of 16 days, such as data MOD13A2.A2018001.H28v06.061.2021313031439.HDF, it shows that the cycle is 2018.1-2018.1.16, according to this reasoning, then the data MYD13A2.A2018009.H28v06.061.2021313072459.HDF the cycle is 2018.1.9-2018.1.24 ? Then the cycle of data MYD13A2.A2018361.H28v06.061.2022004082359.HDF is?
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The MYD13A2.A2018361.H28v06.061.2022004082359 uses the last 4 days of 2018 and the first 12 days of 2019.
So in fact there is some overlap where acquisitions from several days are used in 2 consecutive composite period. Day 9, 10, 11, and 12 of 2019 (and every year) are used to average both the MYD13A2.A2018009.H28v06.061.2021313072459.HDF and the MYD13A2.A2018361.H28v06.061.2022004082359.HDF