GIFT_spatial {GIFT}

Spatial selection of GIFT checklists

Description

Retrieve checklists overlapping with a shape file or a set of coordinates.

Usage

GIFT_spatial(
  shp = NULL,
  coordinates = NULL,
  overlap = "centroid_inside",
  entity_ID = NULL,
  GIFT_version = "latest",
  api = "https://gift.uni-goettingen.de/api/extended/"
)

Arguments

shp

Shapefile provided by the user. Its Coordinate Reference System (CRS) must be set to WGS84 (EPSG code 4326).

coordinates

Custom set of coordinates. The format is a two columns, the first one being longitudes and the second being latitudes. If 4 coordinates are given, the function assumes that these are the four corners of a bounding box.

overlap

A character string defining the criteria to use in order to retrieve checklists. Available options are centroid_inside, extent_intersect, shape_intersect and shape_inside. For example, extent_intersect means that every polygon from GIFT for which the extent intersects the provided shape/coordinates will be retrieved.

entity_ID

Constrain the list of regions to be received by a predefined set of entity_IDs. E.g. this list could come from GIFT_checklists_conditional().

GIFT_version

character string defining the version of the GIFT database to use. The function retrieves by default the latest stable version. If set to beta, the most up-to-date version which is still subject to changes and edits is used.

api

character string defining from which API the data will be retrieved.

Value

A data frame with 3 columns: entity_ID the identification number of a polygon, geo_entity_ref its name, and coverage which indicates the percentage of overlap between the provided shape and the different polygons of GIFT.

References

 Denelle, P., Weigelt, P., & Kreft, H. (2023). GIFT—An R package to
 access the Global Inventory of Floras and Traits. Methods in Ecology
 and Evolution, 14, 2738-2748.
 https://doi.org/10.1111/2041-210X.14213

 Weigelt, P, König, C, Kreft, H. GIFT – A Global Inventory of Floras and
 Traits for macroecology and biogeography. J Biogeogr. 2020; 47: 16– 43.
 https://doi.org/10.1111/jbi.13623

See Also

GIFT_checklists()

Examples

# With a shapefile
data("western_mediterranean")
ex <- GIFT_spatial(shp = western_mediterranean, overlap = "centroid_inside")

# With a shapefile coming from GIFT
spain <- GIFT_shapes(entity_ID = 10071)
ex_spain <- GIFT_spatial(shp = spain)

# With a point 
custom_point <- cbind(9.9, 51)
ex2 <- GIFT_spatial(coordinates = custom_point,
overlap = "extent_intersect")

# With an extent
custom_extent <- cbind(c(-13, -18), c(27.5, 29.3))
ex3 <- GIFT_spatial(coordinates = custom_extent,
overlap = "extent_intersect")

# With a custom polygon
custom_polygon <- cbind(c(-18, -16.9, -13, -13, -18, -18),
c(29.3, 33, 29.3, 27.5, 27.5, 29.3))
ex4 <- GIFT_spatial(coordinates = custom_polygon,
overlap = "extent_intersect")

#With a linestring
custom_linestring <- rbind(c(9.9, 51), c(2.35, 48.9))
custom_linestring <- sf::st_as_sf(as.data.frame(custom_linestring),
coords = c("V1", "V2"))
custom_linestring <- dplyr::summarise(custom_linestring,
geometry = sf::st_combine(geometry))
sf::st_crs(custom_linestring) <- sf::st_crs(western_mediterranean)
ex5 <- GIFT_spatial(shp = custom_linestring, overlap = "extent_intersect")