Extract Raster Time Series Values at Points in Space and Time

Extract values from a time series of rasters at points that each carry their own date-time. The series is described by a reader function rather than by data held in memory, so only the time slices actually needed are read. Values are taken from the slice nearest in time, or interpolated linearly between the two slices that bracket each point. Derived from the extract() method of package 'raadtools'.