On 11-05-17 5:58 AM, Pierre Bruyer wrote:
I'm a French developer (so I am sorry if my english is not perfect). I have a
problem to smooth the contours of a map. I have a dataset with 3 columns, x, y
and z, where x and y are the coordinates of my points and z is evaluate to a
qualitative elevation and his representation is a set of colors, which is
define by levels.
The problem is the curve of my contour is so linear, and I would like a more
continuous contour. I use the function fitted.contour to draw my map.
If you use a finer grid of x,y values you'll get shorter segments and
they will look smoother.
You might be able to use a smooth interpolator (e.g. spline()) rather
than linear interpolation, but those occasionally do strange things e.g.
x <- c(1:4, 5.9, 6:10)
y <- c(1:4, 7, 6:10)
plot(spline(x,y, n=200), type="l")
points(x,y)
where one point is out of line with the others, but the curve
overcompensates in order to stay smooth.
Duncan Murdoch
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