Posted by MartinHvidberg on June 19, 2006, 2:36 pm
Posted by Bent Hermannsen on June 20, 2006, 4:24 pm
Just a thought:
Try fill the circle with hexagons with an area of 1/24 of the circles area
and use the centroids of the hexagons.
regards
Bent
> Sorry for xross posting. Please follow up to: news://comp.infosystems.gis
> I need to sample a number of cases (24) within a circular area. I would
> like the sample points to be 'evenly spaced', in the sense that they
> should each represent an equal size sub area of the circular sample area.
> Had the sample area been a rectangle and not a circle, the choice would be
> easy. I would use the cell centroids of a regular grid net. But using that
> inside a circle results i the cells near the edge to be 'cut' and
> therefore not representing as much area as the sampling points closer to
> the centre of the sample circle.
> Using 'pie slices' is not a good idea as the centroid of each pie slice
> are all ½ radius from the circle centre and therefore give far from a even
> distribution across the entire sampling circle.
> An ideas? All suggestions (also the silly once) are welcome.
> I will sum up
> Best Regards
> Martin@Hvidberg.net
> I need to sample a number of cases (24) within a circular area. I would
> like the sample points to be 'evenly spaced', in the sense that they
> should each represent an equal size sub area of the circular sample area.
> Had the sample area been a rectangle and not a circle, the choice would be
> easy. I would use the cell centroids of a regular grid net. But using that
> inside a circle results i the cells near the edge to be 'cut' and
> therefore not representing as much area as the sampling points closer to
> the centre of the sample circle.
> Using 'pie slices' is not a good idea as the centroid of each pie slice
> are all ½ radius from the circle centre and therefore give far from a even
> distribution across the entire sampling circle.
> An ideas? All suggestions (also the silly once) are welcome.
> I will sum up
> Best Regards
> Martin@Hvidberg.net