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## [1] "2020-06-05"

BFAST Open-source collaborative project on time series based break detection

A unsupervised time series processing tool for detecting abnormality within (bfast) or add the end of a time series (bfastmonitor).

Introduction

Here, on Github, we are currently working towards a new BFAST package for R CRAN. All revelant repositories are located under https://github.com/bfast2

  • installation from Github instructions.

Major updates on BFAST

  • the BFAST package is made a lot faster by C-code implementation and R code improvements by Marius Appel. You can know install it via our readme. See.
  • BFAST GPU code project for python - add link
  • BFAST in Google Earth Engine - add link

BFAST package overview

Overview of key functions for break detection within seasonal/trend time series within the BFAST package:

BFAST overview presentation

  • bfast
  • bfastmonitor
  • bfast01
  • bfast0n() a light version of bfast - more flexible, and can be applied on time series with gaps (i.e. NA’s)
  • etc.

BFAST, Breaks For Additive Season and Trend, integrates the decomposition of time series into trend, season, and remainder components with methods for detecting and characterizing change within time series.

BFAST & BFASTmonitor:

BFAST iteratively estimates the time and number of abrupt changes within time series, and characterizes change by its magnitude and direction. BFAST can be used to analyze different types of time series (e.g. Landsat, MODIS) and can be applied to other disciplines dealing with seasonal or non-seasonal time series, such as hydrology, climatology, and econometrics. The algorithm can be extended to label detected changes with information on the parameters of the fitted piecewise linear models.

BFASTmonitor provides functionality for monitoring disturbances in time series models (with trend/season/regressor terms) at the end of time series (i.e., in near real-time). Based on a model for stable historical behaviour abnormal changes within newly acquired data can be detected. Different models are available for modeling the stable historical behavior. A season-trend model (with harmonic seasonal pattern) is used as a default in the regresssion modelling.

  • Verbesselt, J., Hyndman, R., Newnham, G., & Culvenor, D. (2010). Detecting trend and seasonal changes in satellite image time series. Remote Sensing of Environment, 114, 106-115. DOI: 10.1016/j.rse.2009.08.014. DownLoad Paper

  • Verbesselt, J., Hyndman, R., Zeileis, A., & Culvenor, D. (2010). Phenological change detection while accounting for abrupt and gradual trends in satellite image time series. Remote Sensing of Environment, 114, 2970-2980. DOI: 10.1016/j.rse.2010.08.003. DownLoad Paper

  • Verbesselt, J., Zeileis, A., & Herold, M. (2013). Near real-time disturbance detection using satellite image time series, Remote Sensing of Environment. DOI: 10.1016/j.rse.2012.02.022. DownLoad Paper

BFAST information

BFAST overview presentation

## References