computes bounding box
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.
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)lat |
latitude values |
lon |
longitude values |
TYPE |
|
margin |
relative or absolute margin around the data. Set to NULL if no margin desired. |
q.lat |
latitude quantile trimming, the tails will be trimmed from the bounding box |
q.lon |
longitude quantile trimming, |
verbose |
latR |
latitude range |
lonR |
longitude range |
Markus Loecher
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]));Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.