Simon,
Many thanks for your code!!
Matthias
Am 11.09.2012 16:37, schrieb Simon Hartley:
> My code looks like this:
>
> private static Geometry create3DCircle(double lng, double lat, double
> radiusNm) {
> GeodeticCalculator calc = new
> GeodeticCalculator(DefaultEllipsoid.WGS84);
> calc.setStartingGeographicPoint(lng, lat);
> final int SIDES = 32 + 16 * ((int)Math.ceil(radiusNm / 40) / 5);
> // Fairly random.
>
> double distance = radiusNm * 1852 /*1855.3248*/; //
> Convert to metres.
> double baseAzimuth = 360.0 / SIDES;
> Coordinate coords[] = new Coordinate[SIDES+1];
> for( int i = 0; i < SIDES; i++){
> double azimuth = 180 - (i * baseAzimuth);
> calc.setDirection(azimuth, distance);
> Point2D point = calc.getDestinationGeographicPoint();
> coords[i] = new Coordinate(point.getX(), point.getY());
> }
> coords[SIDES] = coords[0];
>
> LinearRing ring = GEOMETRY_FACTORY.createLinearRing( coords );
> Polygon polygon = GEOMETRY_FACTORY.createPolygon( ring, null );
>
> return polygon;
> }
>
>
>
> Simon Hartley
> Software Developer, AirData
>
>
>
>
> -----Original Message-----
> From: Matthias Lendholt [mailto:[email protected]]
> Sent: 11 September 2012 14:20
> To: [email protected]
> Subject: [Geotools-gt2-users] how to programmatically create circles?
>
> Hi,
>
> In my uDig/Geotools based application I have to programmatically create
> circle geometries based on centre + radius. I assume it will only affect
> geotools + JTS functionalities.
>
> I found this:
> http://docs.codehaus.org/display/GEOTDOC/01+How+to+Create+a+Geometry#id-01HowtoCreateaGeometry-CreatingaCircle
>
> However, my center is a Point in WGS84 and the radius is given in [m]/[km]. I
> guess I have to convert at first my center into another CRS, create the
> circle geometry and then, convert the geometry back into WGS84.
>
> Could anyone provide me the details how to realize these transformations and
> which CRS I have to use?
>
>
> Thanks,
> Matthias
>
>
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