Spatial Early Warning Signals of Ecosystem Degradation

Tools to compute and assess significance of early-warnings signals (EWS) of ecosystem degradation on raster data sets. EWS are metrics derived from the observed spatial structure of an ecosystem -- e.g. spatial autocorrelation -- that increase before an ecosystem undergoes a non-linear transition (Genin et al. (2018) ).


News

spatialwarnings v1.3 (Release date: 2018-12)

New indicators:

  • Planar flowlength (Mayor et al. 2013, Rodriguez et al. 2017)
  • Kolmogorov complexity based on Block Decomposition Method (Dakos and Soler-Toscano 2016)

Improvements:

  • Enable parallel computation of patch size distributions
  • Added a dataset of aerial view of vegetation in Arizona ('arizona')
  • Added functions to compute the coarse-grained variance/skewness on a single matrix

Bug fixes and code improvements:

  • Added missing methods exports for custom indicators
  • Fixed the patch labelling for non-square images
  • General code cleanup and improvement

Documentation and description changes:

spatialwarnings v1.2 (Release date: 2018-06)

Bug fixes:

  • Compilation errors should be fixed on Solaris
  • Fixed coarse-graining bug when input values are non-integer

spatialwarnings v1.1 (Release date: 2018-06)

This release provides changes as to satisfy referees' comments prior to the publication of the package, as long as minor improvements in documentation.

New features:

  • Support for custom indicators (see ?create_indicator)

Minor changes:

  • Documentation improvements
  • Safer handling of small matrices in SDR computation

Name changes

  • *_spews functions are now deprecated in favor of *_sews functions

Bug fixes

  • Counting patches in matrices with 1 line or 1 column does not crash R anymore
  • The R package should now build on Solaris

spatialwarnings v1.0 (Release date: 2017-11-03)

Initial release

Reference manual

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install.packages("spatialwarnings")

1.3.1 by Alexandre Genin, 9 months ago


https://github.com/spatial-ews/spatialwarnings


Browse source code at https://github.com/cran/spatialwarnings


Authors: Alain Danet , Alexandre Genin , Vishwesha Guttal , Sonia Kefi , Sabiha Majumder , Sumithra Sankaran , Florian Schneider


Documentation:   PDF Manual  


MIT + file LICENSE license


Imports Rcpp, ggplot2, plyr, VGAM, reshape2, tidyr, stats, utils, parallel

Suggests moments, poweRlaw, testthat, covr, acss

Linking to Rcpp, RcppArmadillo


See at CRAN