Calculate Cumulative Proximity to Hazards for Geographic Areas • hazprox

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Overview

hazprox includes tools for calculating cumulative, area-based proximity for simple feature objects. The hazprox package can be used to quantify how close a geographic area is to other features of interest and is intended to support exploratory analysis of environmental hazards. This tool is based on the Superfund Proximity measurement described in the Environmental Protection Agency EJScreen Tool Technical Documentation.

Installation

Install the development version of hazprox from GitHub:

library(remotes)
install_github('cdcgov/hazprox')

To install and view available vignettes, specify, build_vignettes = TRUE in your install statement:

install_github('cdcgov/hazprox', build_vignettes = TRUE)
browseVignettes(package = 'hazprox')

Usage

hazprox allows users to calculate cumulative proximity between simple feature (sf) geospatial objects (e.g., POINT, LINESTRING, POLYGON, MULTI*). Statistics are calculated for geographic areas, represented by polygons, based on the inverse distance to other sf objects. The hazprox package comes bundled with several example datasets, including census tracts, fire locations, and Superfund sites in the state of Georgia. Basic usage of the get_proximity() function is shown below. More details on hazprox functions and datasets are available in the package documentation.

library(hazprox)
library(sf)

#import environmental hazard features
fires <- read.csv('inst/extdata/ga_fires.csv')
fires_sf <- sf::st_as_sf(fires, coords = c('Lon', 'Lat'), crs = 4269)

#calculate proximity to fires for all census tracts in Georgia
p <- get_proximity(from = ga, to = fires_sf)

Recommended Citation

Rockhill S (2025). hazprox: Population-Weighted Average Proximity to Hazards. R package version 0.0.0.9000.

Getting Help

If you have questions about this project or need assistance, email srockhill@cdc.gov.

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The repository utilizes code licensed under the terms of the Apache Software License and therefore is licensed under ASL v2 or later.

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hazprox