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Re: contour and points [message #76715]

Wed, 29 June 2011 04:43

Andy Heaps
Messages: 22
Registered: March 2006

Junior Member

Hi Gray,
as Wox says you need to check what the value is at that point. If
you don't have a value for the point in question i.e. it isn't one of
the grid points you used for cgcontour then you'll have to do some
interpolation to find the value at that point.

A user of mine came to me with a similar problem: how do I find
whether a point is inside a country outline? Her example was Norway. I
suggested that she plots the points by number and sees which points are
within the outline of Norway. As she was just using one set of points
and one country this is easier to do by eye. If you have multiple
countries and/or grid points to check this method is too laborious. For
the generalised case I'd open a Z buffer image plot, plot and fill the
country and then check whether your point was the filled colour or
background colour.

Cheers
Andy

On 28/06/11 11:10, Gray wrote:
> Hi all,
>
> What's the easiest/best way to determine which of a set of points is
> inside a contour (created with cgcontour)? Thanks!
>
> --Gray

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[Message index]

		Re: contour and points By: Andy Heaps on Wed, 29 June 2011 04:43
		Re: contour and points By: Wout De Nolf on Tue, 28 June 2011 04:13
		Re: contour and points By: TonyL on Thu, 30 June 2011 18:11
		Re: contour and points By: Michael Galloy on Wed, 29 June 2011 09:36

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