Accessory function to find the folders corresponding to the requested dates period within the full list retrieved by get_moddirs
Arguments
- dates
2- element string array specifying start/end dates (yyyy.mm.dd) for which the http addresses of folders in lpdaac should be retrieved (e.g., c("2015.1.1", "2015.12.31)
- date_dirs
data frame full list of folders in lpdaac archive for product of interest