I am using bfast package for time series analysis. But it requires the files to be read as time series.

How to convert list of stacked images from 2000 to 2013 into a time series and given as input for analysis?

  • 2
    Your data needs to be of class "ts". Take a look at the time series objects help page: stat.ethz.ch/R-manual/R-patched/library/stats/html/ts.html
    – Aaron
    Oct 29, 2014 at 12:18
  • 1
    You should have a look at the example in ?bfastts from the bfast package. It demonstrates the conversion of the first pixel of a 'RasterBrick' to a 'ts' object compatible with bfast.
    – fdetsch
    Oct 29, 2014 at 13:46
  • i tried bfastts but im confused about what date i have to give for stack of one year data as my data is 8 day composite data..please suggest me
    – Tharani
    Dec 3, 2014 at 9:21

1 Answer 1


You may want to explore the "rts" package. It specifically coerces raster stacks into time series objects. Although, I do not know if they are compatible with bfast.

Your best bet would be to vectorize the problem in a function, passed to overlay, and use @Aaron advice by then coercing into a ts object. This is how I approach time series analysis of climate rasters.

  • 1
    Thanks Jeffrey...but the problem has not solved.I am unable to create time series data of 8 day composite which can be given as input for bfast!
    – Tharani
    Dec 11, 2014 at 11:34
  • It would not be a very memory safe approach but, you could read the rasters in using readGDAL in rgdal. This results in a SpatialPixelDataFrame object where each time step is a column in x@data (time=column, pixel=row). You would then iterate through each row (pixel), coerce to a vector then ts object and pass it to the desired function in bfast. I should point out that ?bfast has a clear example of using NDVI data in a timeseries analysis with the function. Dec 11, 2014 at 17:08

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