Spatial Interpolation by Inverse Path Distance Weighting

Functions are provided to interpolate geo-referenced point data via Inverse Path Distance Weighting. Useful for coastal marine applications where barriers in the landscape preclude interpolation with Euclidean distances.


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The R package ipdw provides the functionality to perform interpolation of georeferenced point data using inverse path distance weighting. Interpolation is accomplished in two steps. First, path distances are calculated from each georeferenced (measurement) point to each prediction point. Path distances, which honor barriers in the landscape, are calculated based on cell-to-cell movement through an underlying Raster object that represents movement cost. These path distances are subsequently used as interpolation weights. The two-step routine follows the order of operations described in Suominen et al. (2010) substituting the ESRI path distance algorithm with the gdistance wrapped version of the igraph adjacency algorithm.

The ipdw package was developed with coastal marine applications in mind where path distances (as the fish swims) rather than Euclidean (as the crow flies) distances more accurately represent spatial connectivity. Interpolation of sparse grids in coastal areas otherwise end up bleeding through land areas.

Installation

Stable version from CRAN

install.packages("ipdw")

or development version from GitHub

install.packages('devtools')  # package devtools needed
devtools::install_github("jsta/ipdw")

Examples

see vignette

References

Joseph Stachelek and Christopher J. Madden (2015). Application of Inverse Path Distance weighting for high density spatial mapping of coastal water quality patterns. International Journal of Geographical Information Science preprint | journal

Tapio Suominen, Harri Tolvanen, and Risto Kalliola (2010). Surface layer salinity gradients and flow patterns in the archipelago coast of SW Finland, northern Baltic Sea. Marine Environmental Research journal

News

ipdw 0.2-7

  • Added argument for direct control of costRasterGen output resolution (#8)
  • Added argument for adjusting distance decay power (#11)
  • Added argument to avoid extrapolation by trimming output (#12)
  • Range and distance decay parameters are saved in output object (#13)

ipdw 0.2-6

  • Converted vignette to html
  • More specific namespace handling
  • Added a NEWS.md file to track changes to the package.

Reference manual

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install.packages("ipdw")

0.2-7 by Joseph Stachelek, 5 months ago


https://www.github.com/jsta/ipdw


Report a bug at https://www.github.com/jsta/ipdw/issues


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


Authors: Joseph Stachelek [aut, cre]


Documentation:   PDF Manual  


Task views: Analysis of Spatial Data


GPL (>= 2) license


Imports sp, raster, rgeos, methods

Depends on gdistance

Suggests geoR, gstat, gdata, spatstat, rgdal, testthat, knitr, rmarkdown


See at CRAN