An R function to extract data from netCDF files

I need an R function that compiles data from an online database, which is presented here [login to view URL] with the actual data located here [login to view URL] The original data is stored in a “year-wise” fashion and in netCDF (*.nc) format. Earch netCDF file contains data for the entire globe and for a single day. I need to have data rearranged in a way that a single dataframe in R would hold data for one or several locations and for the entire period covered by the database. This R dataframe would be then in “long” format. The function should do the following: (a) download a set of nc files from the server (preferably with some sort of wget command), (b) select data from a subset of geographical locations specified by coordinate pairs (c) complies data from all years and locations into a single data frame. The function inputs: (a) range of dates for which date should be extracted, (b) a list of locations as coordinate pairs, e.g. as dataframe with location ID, lat and long. The function output is a dataframe in the long format with each row containing data on date and time, location, and the value. This is a time-critical project with delivery by August the 11th.