Package com.luciad.projection

Class TLcdObliqueMercator

java.lang.Object
com.luciad.projection.ALcdProjection
com.luciad.projection.ALcdObliqueCylindrical
com.luciad.projection.TLcdObliqueMercator
All Implemented Interfaces:
ILcdObliqueCylindrical, ILcdProjection, ILcdPropertyChangeSource, Serializable, Cloneable
public class TLcdObliqueMercator extends ALcdObliqueCylindrical
Oblique Mercator projection.

Introduction

Oblique Mercator projection for the State Plane Coordinate System. There are several ways to define this projection. Only the one using an origin and an azimuth at that origin is considered now.

Properties

  • The projection is conformal.
  • Two particular meridians 180° apart are straight lines.
  • Other meridians and parallels are complex curves.
  • Scale on the spherical form is true along the chosen central line.
  • It is also true along a great circle at an oblique angle or along two straight lines parallel to the chosen central line.
  • Scale becomes infinite 90° from the central line.

Example

Sample code


 ILcdProjection projection =
     new TLcdObliqueMercator(-30.0, 20.0, 30.0);

Implementation aspects

The equations of the oblique mercator projection are taken from [Snyder1987].

See Also:

  • Constructor Details

    • TLcdObliqueMercator

      public TLcdObliqueMercator()
      Constructs a oblique mercator projection. All property values (centralMeridian, standardParallel, and azimuth are set to zero.

    • TLcdObliqueMercator

      public TLcdObliqueMercator(double aCentralMeridian, double aStandardParallel, double aAzimuth)
      Constructs a oblique mercator projection.
      Parameters:
      aCentralMeridian - the value for the central meridian property.
      aStandardParallel - the value for the standard parallel property.
      aAzimuth - the value for the azimuth property.

    • TLcdObliqueMercator

      public TLcdObliqueMercator(double aCentralMeridian, double aStandardParallel, double aAzimuth, TLcdObliqueMercator.Variant aVariant)

  • Method Details

    • setStandardParallel

      public void setStandardParallel(double aStandardParallel)
      Description copied from interface: ILcdObliqueCylindrical
      Sets the standardParallel of this ILcdObliqueCylindrical to the parallel with latitude aLatitude.
      Specified by:
      setStandardParallel in interface ILcdObliqueCylindrical
      Overrides:
      setStandardParallel in class ALcdObliqueCylindrical
      Parameters:
      aStandardParallel - The new standardParallel value.
      See Also:

    • setCentralMeridian

      public void setCentralMeridian(double aCentralMeridian)
      Description copied from interface: ILcdObliqueCylindrical
      Sets the centralMeridian of this ILcdObliqueCylindrical to the meridian with longitude aLongitude.
      Specified by:
      setCentralMeridian in interface ILcdObliqueCylindrical
      Overrides:
      setCentralMeridian in class ALcdObliqueCylindrical
      Parameters:
      aCentralMeridian - The new centralMeridian value.
      See Also:

    • setAzimuth

      public void setAzimuth(double aAzimuth)
      Description copied from interface: ILcdObliqueCylindrical
      Sets the azimuth of this ILcdObliqueCylindrical to aAzimuth.
      Specified by:
      setAzimuth in interface ILcdObliqueCylindrical
      Overrides:
      setAzimuth in class ALcdObliqueCylindrical
      Parameters:
      aAzimuth - The new azimuth value.
      See Also:

    • getVariant

      public TLcdObliqueMercator.Variant getVariant()
      Returns the variant of this projection.
      Returns:
      the variant of this projection.

    • lonlatheight2worldOnSphereSFCT

      public void lonlatheight2worldOnSphereSFCT(ILcdPoint aLLHP, double aRadius, ILcd2DEditablePoint aXYPointSFCT) throws TLcdOutOfBoundsException
      Description copied from interface: ILcdProjection
      Transforms an ILcd2DEditablePoint on a sphere into the cartesian coordinate system of the projection.
      Parameters:
      aLLHP - point to be projected.
      aRadius - radius of the sphere (meters).
      aXYPointSFCT - projected point as side effect.
      Throws:
      TLcdOutOfBoundsException - If the ILcdPoint aLLHP is not within the valid area of the projection (visible area), then this exception is thrown.

    • world2lonlatOnSphereSFCT

      public void world2lonlatOnSphereSFCT(ILcdPoint aXYPoint, double aRadius, ILcd2DEditablePoint aLLPSFCT) throws TLcdOutOfBoundsException
      Description copied from interface: ILcdProjection
      Transforms an ILcdPoint from the cartesian coordinate system of the projection into an ILcd2DEditablePoint onto a sphere.
      Parameters:
      aXYPoint - projected point for which the corresponding geodetic point is sought.
      aRadius - radius of the sphere (meters).
      aLLPSFCT - resulting geodetic coordinate as side effect.
      Throws:
      TLcdOutOfBoundsException - If the ILcdPoint aXYPoint is not within the valid area of the projection (visible area), then this exception is thrown.

    • isAllInBounds

      public boolean isAllInBounds()
      Description copied from interface: ILcdProjection
      If all geodetic coordinates (l ,j ) are projected (visible) by an ILcdProjection and all (x,y ) coordinates are bounded this is true. All ILcdProjection objects have bounded (x,y ) coordinates because the projection is cut off if necessary.
      Returns:
      true if all LonLatPoints are within the bounds of the projection, false otherwise.

    • isContinuous

      public boolean isContinuous()
      Description copied from interface: ILcdProjection
      An ILcdProjection is continuous if there are no interruptions in the world coordinates. Most projections are continuous.
      Specified by:
      isContinuous in interface ILcdProjection
      Overrides:
      isContinuous in class ALcdObliqueCylindrical
      Returns:
      true if the projection is continuous, false otherwise.

    • inLonLatBounds

      public boolean inLonLatBounds(ILcdPoint aLLP)
      Description copied from interface: ILcdProjection
      Checks if an ILcdPoint is inside the valid area of geodetic coordinates of the projection. The valid area is determined by the LonLatPoints that are visible and for which the corresponding cartesian coordinate is within the boundaries.
      Parameters:
      aLLP - ILcdPoint to be checked upon.
      Returns:
      true if valid, false if invalid.

    • boundaryLons

      public double[][] boundaryLons(double lat)
      Description copied from class: ALcdProjection
      Default implementation. To be redefined for specific projections.
      Specified by:
      boundaryLons in interface ILcdProjection
      Overrides:
      boundaryLons in class ALcdProjection
      Parameters:
      lat - latitude in decimal degrees and -90.0 <= aLat<= 90.0.
      Returns:
      the array of pairs of longitudes[0] and longitudes[1], where the closed interval longitudes[0] -> longitudes[1] is in visible area and -180.0 <= lon[i] <= 180.0.

    • boundaryLats

      public double[][] boundaryLats(double lon)
      Description copied from class: ALcdProjection
      Default implementation. To be redefined for specific projections.
      Specified by:
      boundaryLats in interface ILcdProjection
      Overrides:
      boundaryLats in class ALcdProjection
      Parameters:
      lon - longitude in decimal degrees -180.0 <= lon <= 180.0 .
      Returns:
      the array of pairs of latitudes lats[0] and lats[1], where the closed interval lats[0] -> lats[1] is in visible area and -90.0 <= lats[i] <= 90.0 .

    • inWorldBoundsOnSphere

      public boolean inWorldBoundsOnSphere(ILcdPoint aXYPoint, double aRadius)
      Description copied from interface: ILcdProjection
      Checks if a ILcdPoint is inside the valid cartesian area of the projection. The valid cartesian area is determined naturally by the projection bounds or by an artificial introduced boundary limit because some cartesian points are at infinity. The shape of the valid cartesian area is in many cases rectangular or circular although it might be more complex.
      Parameters:
      aXYPoint - point to be checked upon.
      aRadius - radius of the sphere.
      Returns:
      true if valid, false if invalid.

    • world2DEditableBoundsOnSphereSFCT

      public void world2DEditableBoundsOnSphereSFCT(double aRadius, ILcd2DEditableBounds aWorldBound)
      Description copied from interface: ILcdProjection
      Sets the ILcd2DEditableBounds object to the bounds of the projection in world coordinates.
      Parameters:
      aRadius - radius of the sphere.
      aWorldBound - the bounds of the projection in world coordinates as side effect.

    • calculateCachedValues

      protected void calculateCachedValues()
      Description copied from class: ALcdObliqueCylindrical
      Constants based on the longitude, latitude, standard parallel, and azimuth of the projection don't have to be recalculated every time a method is called. They only have to be calculated when the projection properties change. Within the methods the precalculated values then can be used in order to gain efficiency.
      Overrides:
      calculateCachedValues in class ALcdObliqueCylindrical

    • lonlatheight2worldOnEllipsoidSFCT

      public void lonlatheight2worldOnEllipsoidSFCT(ILcdPoint aLLP, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aXYPointSFCT) throws TLcdOutOfBoundsException
      Description copied from class: ALcdProjection
      Default implementation calls lonlatheight2worldOnEllipsoidSFCT with aEllipsoid.getAuxRadius() as sphere radius.
      Specified by:
      lonlatheight2worldOnEllipsoidSFCT in interface ILcdProjection
      Overrides:
      lonlatheight2worldOnEllipsoidSFCT in class ALcdProjection
      Parameters:
      aLLP - point to be projected.
      aEllipsoid - ellipsoid on which the point is defined.
      aXYPointSFCT - projected point as side effect.
      Throws:
      TLcdOutOfBoundsException - If the ILcdPoint aLLHP is not within the valid area of the projection (visible area), then this exception is thrown.

    • world2lonlatOnEllipsoidSFCT

      public void world2lonlatOnEllipsoidSFCT(ILcdPoint aXYPoint, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aLLPSFCT) throws TLcdOutOfBoundsException
      Description copied from class: ALcdProjection
      Default implementation calls world2lonlatOnSphereSFCT with aEllipsoid.getAuxRadius() as sphere radius.
      Specified by:
      world2lonlatOnEllipsoidSFCT in interface ILcdProjection
      Overrides:
      world2lonlatOnEllipsoidSFCT in class ALcdProjection
      Parameters:
      aXYPoint - projected point for which the corresponding geodetic point is sought.
      aEllipsoid - ellipsoid on which the geodetic coordinate is defined.
      aLLPSFCT - resulting geodetic coordinate as side effect.
      Throws:
      TLcdOutOfBoundsException - If the ILcdPoint aXYPoint is not within the valid area of the projection (visible area), then this exception is thrown.

    • inWorldBoundsOnEllipsoid

      public boolean inWorldBoundsOnEllipsoid(ILcdPoint aXYPoint, ILcdEllipsoid aEllipsoid)
      Description copied from class: ALcdProjection
      Default implementation calls inWorldBoundsOnSphere with aEllipsoid.getAuxRadius() as sphere radius.
      Specified by:
      inWorldBoundsOnEllipsoid in interface ILcdProjection
      Overrides:
      inWorldBoundsOnEllipsoid in class ALcdProjection
      Parameters:
      aXYPoint - point to be checked upon.
      aEllipsoid - ellipsoid on which the geodetic coordinate is defined.
      Returns:
      true if valid, false if invalid.
      See Also:

    • world2DEditableBoundsOnEllipsoidSFCT

      public void world2DEditableBoundsOnEllipsoidSFCT(ILcdEllipsoid aEllipsoid, ILcd2DEditableBounds aWorldBoundsSFCT)
      Description copied from class: ALcdProjection
      Default implementation calls world2lonlatOnSphereSFCT with aEllipsoid.getAuxRadius() as sphere radius.
      Specified by:
      world2DEditableBoundsOnEllipsoidSFCT in interface ILcdProjection
      Overrides:
      world2DEditableBoundsOnEllipsoidSFCT in class ALcdProjection
      Parameters:
      aEllipsoid - ellipsoid considered.
      aWorldBoundsSFCT - the bounds of the projection in world coordinates as side effect.

    • clone

      public Object clone()
      Description copied from interface: ILcdProjection
      Makes a deep clone of this ILcdProjection.
      Specified by:
      clone in interface ILcdProjection
      Overrides:
      clone in class ALcdObliqueCylindrical
      Returns:
      deep clone of this ILcdProjection.

    • toString

      public String toString()
      Returns the String representation of the oblique mercator projection.
      Specified by:
      toString in interface ILcdProjection
      Overrides:
      toString in class Object
      Returns:
      the String representation of the oblique mercator projection.

    • equals

      public boolean equals(Object o)
      Description copied from interface: ILcdProjection
      Checks if this ILcdProjection equals some other Object.
      Specified by:
      equals in interface ILcdProjection
      Overrides:
      equals in class ALcdObliqueCylindrical
      Parameters:
      o - Object to compare with.
      Returns:
      true if the Object is an instance of the same ILcdProjection class and having the same projection properties, false otherwise.

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class ALcdObliqueCylindrical

    • loadProperties

      public void loadProperties(String aPrefix, Properties aProperty) throws IllegalArgumentException
      Description copied from class: ALcdObliqueCylindrical
      Loads the 3 properties of an ALcdObliqueCylindrical: the centralMeridian, the azimuth and the standardParallel. This method will, given aPrefix, analyze the aProperties object to set the properties of this ALcdObliqueCylindrical. The values of following keys are retrieved:
      • <aPrefix><the name of the class that extends this abstract class>.centralMeridian
      • <aPrefix><the name of the class that extends this abstract class>.standardParallel
      • <aPrefix><the name of the class that extends this abstract class>.azimuth
      Specified by:
      loadProperties in interface ILcdProjection
      Overrides:
      loadProperties in class ALcdObliqueCylindrical
      Parameters:
      aPrefix - prefix of the property names.
      aProperty - Properties object containing the serialized properties.
      Throws:
      IllegalArgumentException - if the projection cannot be created.

    • writePropertiesSFCT

      public void writePropertiesSFCT(String aPrefix, Properties aPropertySFCT)
      Description copied from class: ALcdObliqueCylindrical
      Writes the 3 properties of an ALcdObliqueCylindrical: the centralMeridian, the azimuth and the standardParallel. This method will, given aPrefix, store the properties of this ALcdObliqueCylindrical into the aProperties object. The values of following keys are stored:
      • <aPrefix><the name of the class that extends this abstract class>.centralMeridian
      • <aPrefix><the name of the class that extends this abstract class>.standardParallel
      • <aPrefix><the name of the class that extends this abstract class>.azimuth
      Specified by:
      writePropertiesSFCT in interface ILcdProjection
      Overrides:
      writePropertiesSFCT in class ALcdObliqueCylindrical
      Parameters:
      aPrefix - prefix for the property names.
      aPropertySFCT - Properties object to store the serialized properties by side effect.