airdist function

Measure distance from plot

Measure a distance between two points on a plot using locator; the function checks par("plt") and par("usr") to try to ensure that the aspect ratio y/x is 1, that is that the units of measurement in both x and y are equivalent.

airdist(ann=FALSE)

Arguments

• ann: annotate the plot with line measured and distance

Returns

a list with members: - dist: distance measured

• coords: coordinates between which distance is measured

Author(s)

Roger Bivand Roger.Bivand@nhh.no

See Also

locator