read_fude() reads MAFF Fude Polygon data from a ZIP file and returns the
layers as a list of sf::sf() objects. The ZIP may contain one or more spatial
data files such as GeoJSON (.json or .geojson) and FlatGeobuf
(.fgb). The function also works with ZIP files you created, as long as
the original filenames are unchanged.
Usage
read_fude(
path = NULL,
pref = NULL,
year = 2025,
rcom_year = 2020,
supplementary = FALSE,
to_wgs84 = TRUE,
quiet = FALSE
)Arguments
- path
Path to a ZIP file containing one or more supported spatial files (
.geojson,.json, and.fgb).- pref
Prefecture name or a two-digit prefecture code.
- year
Year when the Fude Polygon data were created.
- rcom_year
Year of the agricultural community boundary data.
- supplementary
Logical. If
TRUE, add supplementary information for each polygon.- to_wgs84
Logical. If
TRUE, transform coordinates to WGS 84 (EPSG:4326).- quiet
Logical. If
TRUE, suppress messages about reading progress.
Value
A list of sf::sf() objects.
Examples
path <- system.file("extdata", "castle.zip", package = "fude")
d <- read_fude(path)
#> Reading layer `2021_382019' from data source
#> `/private/var/folders/33/1nmp7drn6c56394qxrzb2cth0000gn/T/RtmpbJpaQf/filecdccbc4cf9b/castle/2021_382019.json'
#> using driver `GeoJSON'
#> Simple feature collection with 1 feature and 7 fields
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: 132.7653 ymin: 33.84506 xmax: 132.7662 ymax: 33.84575
#> Geodetic CRS: WGS 84
#> Reading layer `2022_382019' from data source
#> `/private/var/folders/33/1nmp7drn6c56394qxrzb2cth0000gn/T/RtmpbJpaQf/filecdccbc4cf9b/castle/2022_382019.json'
#> using driver `GeoJSON'
#> Simple feature collection with 1 feature and 7 fields
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: 132.7653 ymin: 33.84506 xmax: 132.7662 ymax: 33.84575
#> Geodetic CRS: WGS 84
#> Reading layer `2022_382078' from data source
#> `/private/var/folders/33/1nmp7drn6c56394qxrzb2cth0000gn/T/RtmpbJpaQf/filecdccbc4cf9b/castle/2022_382078.json'
#> using driver `GeoJSON'
#> Simple feature collection with 1 feature and 7 fields
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: 132.541 ymin: 33.50931 xmax: 132.5415 ymax: 33.50966
#> Geodetic CRS: WGS 84