
Thiago,

With uncertainty, as this is beyond my pay grade, might I suggest looking at spacetime,

http://cran.r-project.org/web/packages/spacetime/index.html ,

using Matt's method to extract the dates from file names to become your xts date object.

As all the spacetime objects derive from ST (and xts), spatial pixels data frame would be available.

There are additionally overlay and aggregation methods available in spacetime for your data,

but I have not explored these as yet.  I hope this is useful rather than a distraction.

Chris English
  		 	   		  
	[[alternative HTML version deleted]]

