rmacrostrat (version 1.0.0)

get_map_points: Retrieve geologic map point shape element data

Description

A function to retrieve data for geologic map point shape elements from various sources.

Usage

get_map_points(
  point_id = NULL,
  point_type = NULL,
  min_lat = NULL,
  min_lng = NULL,
  max_lat = NULL,
  max_lng = NULL,
  source_id = NULL,
  sf = TRUE
)

Value

An sf object containing the following columns:

• point_id: The identification number of the point element.

• strike: The strike value of the point element.

• dip: The dip value of the point element.

• dip_dir: The dip direction of the point element.

• point_type: The type of point element (e.g. "bedding").

• certainty: The certainty of the point element location.

• comments: Notes assigned to the point element.

• source_id: The unique identification number of the source for the point element.

• geometry: The point spatial data.

If sf is TRUE (the default), an sf object is returned, with the a "geometry" column that contains the spatial data. If sf is FALSE, a data.frame object is returned with two additional columns (lng, lat) containing the geographic coordinates of the point elements.

Arguments

point_id

integer. The unique identification number(s) of the point(s) to return.

point_type

character. Filter points to those of one or more point type(s). Options are "cleavage", "bedding", "axial plane", "fault plane", "foliation", and "joint". Ignored if point_id is supplied.

min_lat

integer. The minimum latitude used to define the bounding box of the points to return. Requires min_lng, max_lat, and max_lng. Ignored if point_id is supplied.

min_lng

integer. A minimum longitude used to define the bounding box of the points to return. Requires min_lat, max_lat, and max_lng. Ignored if point_id is supplied.

max_lat

integer. A maximum latitude used to define the bounding box of the points to return. Requires min_lat, min_lng, and max_lng. Ignored if point_id is supplied.

max_lng

integer. A maximum longitude used to define the bounding box of the points to return. Requires min_lat, min_lng, and max_lat. Ignored if point_id is supplied.

source_id

integer. The unique identification number(s) of the source(s) to filter the points by. Ignored if point_id is supplied.

sf

logical. Should the results be returned as an sf object? Defaults to TRUE.

Developer(s)

Lewis A. Jones

Reviewer(s)

Bethany Allen

Details

More information can be found relating to the inputs for this function using the definition functions (beginning with def_).

See Also

Geologic maps: def_sources(), get_map_legends(), get_map_outcrop()

Examples

# \donttest{
# Return a specific point
ex1 <- get_map_points(point_id = 1)
# Return all points within a user-specified bounding box
ex2 <- get_map_points(min_lng = -80, min_lat = 40,
                      max_lng = -70, max_lat = 50)
# }