Thanks Jody,
This will interpolate points into a line. What I was needing was to interpolate
a given points value using preferably bi-liner interpolation of four
surrounding point-value pairs.
Has anyone done anything like this before?
Thanks,
Mike O'Toole
On Jun 3, 2011, at 4:43 PM, Jody Garnett wrote:
> The docs have something for spline:
>
> public Geometry splineInterpolatePoints(double[] xPoints, double[] yPoints) {
> /*
> * First we create a LineString of segments with the
> * input points as vertices.
> */
> final int N = xPoints.length;
> Coordinate[] coords = new Coordinate[N];
> for (int i = 0; i < N; i++) {
> coords[i] = new Coordinate(xPoints[i], yPoints[i]);
> }
> GeometryFactory gf = new GeometryFactory();
> LineString line = gf.createLineString(coords);
>
> /*
> * Now we use the GeoTools JTS utility class to smooth the
> * line. The returned Geometry will have all of the vertices
> * of the input line plus extra vertices tracing a spline
> * curve. The second argument is the 'fit' parameter which
> * can be in the range 0 (loose fit) to 1 (tightest fit).
> */
> return JTS.smooth(line, 0.0);
> }
> If you set the range to 1 it should be basically linear.
> --
> Jody Garnett
>
> On Saturday, 4 June 2011 at 4:57 AM, Mike O'Toole wrote:
>
>> Hi all,
>>
>> Is there support in GeoTools for the interpolation of a specified points
>> value given 4 other points with values? I have been looking at the
>> org.geotools.filter.function.InterpolateFunction Class. However, it does not
>> seem to support the input I need. If this is possible will someone please
>> share a quick example.
>>
>> Thanks!
>>
>> Mike
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