RgoogleMaps (version 1.0)

qbbox: computes bounding box

Description

The function qbbox computes a bounding box for the given lat,lon points with a few additional options such as quantile boxes, additional margins, etc.

Usage

qbbox(lat, lon, TYPE = c("all", "quantile")[1], 
      margin = list( m = c(1, 1, 1, 1), TYPE = c("perc", "abs")[1] ), 
      q.lat = c(0.1, 0.9), q.lon = c(0.1, 0.9), verbose = 0)

Arguments

lat

latitude values

lon

longitude values

TYPE

if 'ALL' return just the ranges, if 'quantile' return the quantiles specified by q.lat and q.lon

margin

list of parameters describing any desired extra margin: m: margins for the four sides; TYPE: percentage or absolute margin ?

q.lat

lower and upper quantile for the longitude range

q.lon

lower and upper quantile for the latitude range

verbose

level of verbosity

Value

• latR
  latitude range
• lonR
  longitude range

Examples

lat = 37.85 + rnorm(100, sd=0.001);
  lon = -120.47 + rnorm(100, sd=0.001);
  #add a few outliers:
  lat[1:5] <- lat[1:5] + rnorm(5, sd =.01);
  lon[1:5] <- lon[1:5] + rnorm(5, sd =.01);
  
  #range, discarding the upper and lower 10% of the data
  qbbox(lat, lon, TYPE = "quantile");
  #full range:
  qbbox(lat, lon, TYPE = "all");
  #add a 10% extra margin on all four sides:
  qbbox(lat, lon, margin = list(m = c(10, 10, 10, 10), TYPE = c("perc", "abs")[1]));