Package index • spax

Core Accessibility Functions

Main functions for spatial accessibility analysis

spax_2sfca(): Calculate Original Two-Step Floating Catchment Area (2SFCA) accessibility scores
spax_e2sfca(): Calculate Enhanced Two-Step Floating Catchment Area (E2SFCA) accessibility scores
spax_m2sfca(): Calculate Modified Two-Step Floating Catchment Area (M2SFCA) accessibility scores
compute_access(): Calculate spatial accessibility using weighted surfaces

Distance & Decay Functions

Functions for handling distance relationships

calc_decay(): Calculate Spatial Distance Decay Weights
calc_choice(): Compute Spatial Choice Probabilities
calc_normalize(): Normalize Spatial Weights

Data Processing Functions

Functions for processing spatial data

spread_weighted(): Distribute values across weighted surfaces
spread_access(): Calculate spatial accessibility scores
gather_weighted(): Aggregate weighted values from a raster
gather_demand(): Calculate demand captured by each service site
rasterize_demand(): Convenience wrapper for Bayesian spatial updating
transform_pmf(): Transform input into a probability mass function (PMF)
transform_demand(): Transform Case Count Data into Spatial Distribution

Simulation & Sampling

Functions for spatial simulation

sample_pmf(): Sample Points from Probability Surface with Multiple Realizations
update_pmf(): Update Probability Mass Function with Likelihood Surface
transform_likelihood(): Transform Input to Likelihood Surface

Object Methods

Print, summary, and plot methods for spax objects

print(<spax>): Print method for spax objects
summary(<spax>): Summary method for spax objects
print(<summary.spax>): Print function for spax summary objects
plot(<spax>): Plot Spatial Accessibility Results
print(<spax_field>): Print a spax_field

Utility Functions

Helper functions and data access

read_spax_example(): Read Example Datasets from spax Package
read_spax(): Read a spax object from disk
save_spax(): Save a spax accessibility analysis

Package Data

Documentation for included datasets

u5pd: Under-5 Population Density in Thailand's Health Region 12
hos_iscr: Example Isochrone Data for Thailand Health Region 12
hos_iscvec: Hospital Travel Time Isochrones (Vector Format)
phc_iscr: Example Primary Health Center Travel Time Isochrones
hc12 hc12_phc hc12_hos: Health Facilities in Thailand's Region 12
bound0: Thailand Health Region 12 Boundary Area - Boundary
bound1: Thailand Region 12 ADM1 Boundaries with Attributes