Class CylindricalEqualArea

  • All Implemented Interfaces:
    Serializable, Parameterized, Lenient­Comparable, Math­Transform, Math­Transform2D

    public class CylindricalEqualArea
    extends NormalizedProjection
    Cylindrical Equal Area projection (EPSG codes 9834, 9835). This is the simplest equal-area projection. This projection has various names depending on its standard parallel:
    Non-exhaustive list of variants
    Name Standard parallel
    Lambert cylindrical equal-area
    Behrmann cylindrical equal-area 30°
    Gall orthographic 45°
    Balthasart 50°
    The parallels and the meridians are straight lines and cross at right angles. The scale is true along standard parallels, but distortion increase greatly at other locations. Distortions are so great that there is little use of this projection for world mapping purposes. However this projection may be useful for computing areas.
    See Also:
    Serialized Form

    Defined in the sis-referencing module

    • Constructor Detail

      • CylindricalEqualArea

        public CylindricalEqualArea​(OperationMethod method,
                                    Parameters parameters)
        Creates a Cylindrical Equal Area projection from the given parameters.
        method - Description of the projection parameters.
        parameters - The parameter values of the projection to create.
    • Method Detail

      • transform

        public void transform​(double[] srcPts,
                              int srcOff,
                              double[] dstPts,
                              int dstOff,
                              int numPts)
                       throws TransformException
        Converts a list of coordinate points. This method performs the same calculation than above transform(double[], int, double[], int, boolean) method, but is overridden for efficiency.
        Specified by:
        transform in interface Math­Transform
        transform in class Abstract­Math­Transform
        src­Pts - the array containing the source point coordinates.
        src­Off - the offset to the first point to be transformed in the source array.
        dst­Pts - the array into which the transformed point coordinates are returned. May be the same than src­Pts.
        dst­Off - the offset to the location of the first transformed point that is stored in the destination array.
        num­Pts - the number of point objects to be transformed.
        Transform­Exception - if a point can not be converted.
      • inverseTransform

        protected void inverseTransform​(double[] srcPts,
                                        int srcOff,
                                        double[] dstPts,
                                        int dstOff)
                                 throws ProjectionException
        Converts the specified (x,y) coordinates and stores the result in dst­Pts (angles in radians).
        Specified by:
        inverse­Transform in class Normalized­Projection
        src­Pts - the array containing the source point coordinate, as linear distance on a unit sphere or ellipse.
        src­Off - the offset of the point to be converted in the source array.
        dst­Pts - the array into which the converted point coordinate is returned (may be the same than src­Pts). Coordinates will be (longitude, latitude) angles in radians.
        dst­Off - the offset of the location of the converted point that is stored in the destination array.
        Projection­Exception - if the point can not be converted.