polyread

The goal of polyread is to read Polygon Filter File Format (.poly) files (which are defined here), and convert them to sfc format.

Installation

You can install the development version of polyread with:

remotes::install_github("agila5/polyread")

Example

This is a basic example which shows you how to solve a common problem:

library(polyread)

## basic example code: read a poly file and convert to MULTIPOLYGON
africa_url <- "http://download.openstreetmap.fr/polygons/africa.poly"
africa_con <- url(africa_url)
africa_poly <- readLines(africa_con); close(africa_con) # don't forget to close the connection
(africa_multipolygon <- convert_poly_to_sfc(africa_poly))
#> Geometry set for 1 feature 
#> geometry type:  MULTIPOLYGON
#> dimension:      XY
#> bbox:           xmin: -30.8363 ymin: -60.3167 xmax: 61.62511 ymax: 37.77817
#> geographic CRS: WGS 84
#> MULTIPOLYGON (((11.60092 33.99875, 11.60207 37....

A map:

italy_con <- url("http://download.openstreetmap.fr/polygons/europe/italy.poly")
italy_poly <- readLines(italy_con); close(italy_con)

italy_multipolygon <- convert_poly_to_sfc(italy_poly)
mapview::mapview(italy_multipolygon)

Code of Conduct

Please note that the polyread project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.