polygon class
Examples
x <- '{ "type": "Polygon",
"coordinates": [
[ [100.0, 0.0], [100.0, 1.0], [101.0, 1.0], [101.0, 0.0], [100.0, 0.0] ]
]
}'
(y <- polygon(x))
#> <Polygon>
#> no. lines: 1
#> no. holes: 0
#> no. nodes / line: 5
#> coordinates: [[[100,0],[100,1],[101,1],[101,0],[100,0]]]
y[1]
#> [1] "{ \"type\": \"Polygon\",\n\"coordinates\": [\n [ [100.0, 0.0], [100.0, 1.0], [101.0, 1.0], [101.0, 0.0], [100.0, 0.0] ]\n ]\n}"
geo_type(y)
#> [1] "Polygon"
geo_pretty(y)
#> {
#> "type": "Polygon",
#> "coordinates": [
#> [
#> [
#> 100.0,
#> 0.0
#> ],
#> [
#> 100.0,
#> 1.0
#> ],
#> [
#> 101.0,
#> 1.0
#> ],
#> [
#> 101.0,
#> 0.0
#> ],
#> [
#> 100.0,
#> 0.0
#> ]
#> ]
#> ]
#> }
#>
geo_write(y, f <- tempfile(fileext = ".geojson"))
jsonlite::fromJSON(f, FALSE)
#> $type
#> [1] "Polygon"
#>
#> $coordinates
#> $coordinates[[1]]
#> $coordinates[[1]][[1]]
#> $coordinates[[1]][[1]][[1]]
#> [1] 100
#>
#> $coordinates[[1]][[1]][[2]]
#> [1] 0
#>
#>
#> $coordinates[[1]][[2]]
#> $coordinates[[1]][[2]][[1]]
#> [1] 100
#>
#> $coordinates[[1]][[2]][[2]]
#> [1] 1
#>
#>
#> $coordinates[[1]][[3]]
#> $coordinates[[1]][[3]][[1]]
#> [1] 101
#>
#> $coordinates[[1]][[3]][[2]]
#> [1] 1
#>
#>
#> $coordinates[[1]][[4]]
#> $coordinates[[1]][[4]][[1]]
#> [1] 101
#>
#> $coordinates[[1]][[4]][[2]]
#> [1] 0
#>
#>
#> $coordinates[[1]][[5]]
#> $coordinates[[1]][[5]][[1]]
#> [1] 100
#>
#> $coordinates[[1]][[5]][[2]]
#> [1] 0
#>
#>
#>
#>
unlink(f)
x <- '{ "type": "Polygon",
"coordinates": [
[ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ],
[ [100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2] ]
]
}'
(y <- polygon(x))
#> <Polygon>
#> no. lines: 2
#> no. holes: 1
#> no. nodes / line: 5, 5
#> coordinates: [[[100,0],[101,0],[101,1],[100,1],[100,0]],[[100.2,0.2],[100.8,0.2],[1 ...
y[1]
#> [1] "{ \"type\": \"Polygon\",\n\"coordinates\": [\n [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ],\n [ [100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2] ]\n ]\n}"
geo_type(y)
#> [1] "Polygon"
geo_pretty(y)
#> {
#> "type": "Polygon",
#> "coordinates": [
#> [
#> [
#> 100.0,
#> 0.0
#> ],
#> [
#> 101.0,
#> 0.0
#> ],
#> [
#> 101.0,
#> 1.0
#> ],
#> [
#> 100.0,
#> 1.0
#> ],
#> [
#> 100.0,
#> 0.0
#> ]
#> ],
#> [
#> [
#> 100.2,
#> 0.2
#> ],
#> [
#> 100.8,
#> 0.2
#> ],
#> [
#> 100.8,
#> 0.8
#> ],
#> [
#> 100.2,
#> 0.8
#> ],
#> [
#> 100.2,
#> 0.2
#> ]
#> ]
#> ]
#> }
#>
# add to a data.frame
library('tibble')
tibble(a = 1:5, b = list(y))
#> # A tibble: 5 × 2
#> a b
#> <int> <list>
#> 1 1 <geoplygn [1]>
#> 2 2 <geoplygn [1]>
#> 3 3 <geoplygn [1]>
#> 4 4 <geoplygn [1]>
#> 5 5 <geoplygn [1]>