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)
ann |
annotate the plot with line measured and distance |
a list with members:
dist |
distance measured |
coords |
coordinates between which distance is measured |
Roger Bivand Roger.Bivand@nhh.no
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