segmentLocator: Plot/Locate road segment by ID.

In lindbrook/cholera: Amend, Augment and Aid Analysis of John Snow's Cholera Map

Plot/Locate road segment by ID.

Description

Highlight selected road segment(s) and cases.

Usage

segmentLocator(segment.id = "216-1", zoom = TRUE, latlong = FALSE,
  cases = "address", token = "id", vestry = FALSE, add.pump = TRUE,
  add.title = TRUE, add.subtitle = TRUE, highlight = TRUE,
  distance.unit = "meter", time.unit = "second", walking.speed = 5,
  cex.text = 0.67)

Arguments

segment.id	Character. A vector of segment IDs. See Note.
zoom	Logical or Numeric. Positive value zoom in. Negative values zoom out.
latlong	Logical. Longitude and latitude coordinates
cases	Character. Cases to plot: NULL, "address" or "fatality".
token	Character. Cases as "id" or "point".
vestry	Logical. TRUE uses the 14 pumps from the Vestry report. FALSE uses the 13 in the original map.
add.pump	Logical. Include pumps.
add.title	Logical. Include title.
add.subtitle	Logical. Include subtitle.
highlight	Logical. Highlight selected segment(s) and cases.
distance.unit	Character. Unit of distance: "meter", "yard" or "native". "native" returns the map's native scale. See vignette("roads") for information on conversion.
time.unit	Character. "hour", "minute", or "second".
walking.speed	Numeric. Walking speed in km/hr.
cex.text	Numeric.

Value

A base R graphics plot.

Note

With Dodson and Tobler's data, a street (e.g., Broad Street) is often comprised of multiple straight line segments. To identify each segment individually, an additional number is appended to form a text string ID (e.g., "116-2"). See cholera::road.segments.

Examples

segmentLocator("216-1")
segmentLocator("216-1", zoom = -10)
segmentLocator("216-1", latlong = TRUE, zoom = -10)
segmentLocator("216-1", distance.unit = "yard")
segmentLocator("216-1", zoom = FALSE)

lindbrook/cholera documentation built on Jan. 13, 2025, 3:49 p.m.