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An R package to compute the potential model as defined by Stewart (1941).
riatelab/potential
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This package provides functions to compute the potential model asdefined by Stewart (1941). Several options are available to customizethe model, for example it is possible to fine-tune the distance frictionfunctions or to use custom distance matrices. Some computations areparallelized to improve their efficiency.
You can install the released version ofpotential fromCRAN with:
install.packages("potential")You can install the development version ofpotential from GitHub with:
# install.packages("remotes")remotes::install_github("riatelab/potential")
library(mapsf)library(potential)# Display the spatial interaction functionplot_inter(fun="e",span=75000,beta=2,limit=250000)
# create a regular gridy<- create_grid(x=n3_poly,res=20000)# compute potentialspot<- mcpotential(x=n3_pt,y=y,var="POP19",fun="e",span=75000,beta=2,limit=250000,ncl=2)# Define potential according to the maximum valuey$pot<-pot/ max(pot)*100# create equipotential areasbks<- seq(0,100,length.out=11)equipot<- equipotential(y,var="pot",breaks=bks,mask=n3_poly)# map potentialsmf_theme("default")mf_map(x=equipot,var="min",type="choro",breaks=bks,pal= hcl.colors(10,'Teal'),border="#121725",leg_val_rnd=0,lwd=.2,leg_pos="topright",leg_title="Potential Intensity")mf_title(txt="Potentials of Population")mf_credits(txt="© EuroGeographics for the administrative boundaries and © Eurostat for data")
This package provides access to the revamped potential-related functionsinitially offered bySpatialPosition.
Stewart, John Q. 1941. “An Inverse Distance Variation for Certain SocialInfluences.”Science 93 (2404): 89–90.https://doi.org/10.1126/science.93.2404.89.
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An R package to compute the potential model as defined by Stewart (1941).