Package noaa.coastwatch.util.trans

Class HammerProjection

java.lang.Object

noaa.coastwatch.util.MetadataContainer

noaa.coastwatch.util.trans.EarthTransform

noaa.coastwatch.util.trans.EarthTransform2D

noaa.coastwatch.util.trans.MapProjection

noaa.coastwatch.util.trans.GCTPStyleProjection

noaa.coastwatch.util.trans.GCTPCStyleProjection

noaa.coastwatch.util.trans.HammerProjection

All Implemented Interfaces:

Cloneable, ProjectionConstants

public class HammerProjection
extends GCTPCStyleProjection

The HammerProjection class performs Hammer map projection calculations.

Since:

3.3.0

Author:

Peter Hollemans

Field Summary

Fields inherited from class noaa.coastwatch.util.trans.GCTPCStyleProjection

ERROR, IN_BREAK, LAT, LON, OK, params, X, Y

Fields inherited from class noaa.coastwatch.util.trans.GCTPStyleProjection

C3P, D2R, ec, ec2, EPSLN, falseEast, falseNorth, HALF_PI, PI, R2D, rMajor, TWO_PI

Fields inherited from class noaa.coastwatch.util.trans.MapProjection

datum, DESCRIPTION, forwardAffine, inverseAffine, spheroid, system, zone

Fields inherited from class noaa.coastwatch.util.trans.EarthTransform

boundaryHandler, dims

Fields inherited from interface noaa.coastwatch.util.trans.ProjectionConstants

ALASKA, ALBERS, AZMEQD, EQRECT, EQUIDC, GEO, GNOMON, GOOD, GVNSP, HAMMER, HOM, IMOLL, LAMAZ, LAMCC, MAX_PROJECTIONS, MERCAT, MILLER, MOLL, OBEQA, ORTHO, POLYC, PROJECTION_NAMES, PS, ROBIN, SNSOID, SOM, SPCS, STEREO, TM, USDEF, UTM, VGRINT, WAGIV, WAGVII

Constructor Summary

Constructors

Constructor	Description
HammerProjection(double rMajor, int[] dimensions, AffineTransform affine, double center_long, double falseEast, double falseNorth)	Constructs a map projection from the specified projection and affine transform.

Method Summary

Modifier and Type	Method	Description
protected long	projfor(double lat, double lon, double[] x, double[] y)	Performs the actual forward calculation as specified in the GCTP C code.
protected long	projinv(double x, double y, double[] lon, double[] lat)	Performs the actual inverse calculation as specified in the GCTP C code.

Methods inherited from class noaa.coastwatch.util.trans.GCTPCStyleProjection

cenlat, cenlon, cenlonmer, genrpt, genrpt_long, getParameters, mapTransformFor, mapTransformInv, offsetp, origin, p_error, p_error, p_error, paksz, phi1z, phi2z, phi3z, phi4z, ptitle, radius, radius2, setParameters, sprintf, stanparl, stparl1

Methods inherited from class noaa.coastwatch.util.trans.GCTPStyleProjection

adjust_lon, asinz, calc_utm_zone, e0fn, e1fn, e2fn, e3fn, e4fn, mlfn, msfnz, pack_angle, pakcz, pakr2dm, phi1z, phi2z, phi3z, phi4z, qsfnz, setDatum, setFalse, sign, sphdz, tsfnz, unpack_angle

Methods inherited from class noaa.coastwatch.util.trans.MapProjection

clone, describe, equals, getAffine, getDatum, getModified, getPixelDimensions, getPixelSize, getProjection, getSpheroid, getSpheroidName, getSubset, getSubset, getSystem, getSystemName, getZone, isOrientable, setAffine, setPositiveLon, transformImpl, transformImpl

Methods inherited from class noaa.coastwatch.util.trans.EarthTransform2D

get2DVersion, getBoundingBox, getWorldAxes, main, setPointTransform, transformToPoint

Methods inherited from class noaa.coastwatch.util.trans.EarthTransform

closest, distance, getBoundaryHandler, getDimensions, getResolution, getSpheroid, getSpheroid, isInvertible, transform, transform, transform, transform

Methods inherited from class noaa.coastwatch.util.MetadataContainer

getMetadataMap

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HammerProjection

public HammerProjection(double rMajor,
 int[] dimensions,
 AffineTransform affine,
 double center_long,
 double falseEast,
 double falseNorth)
                 throws NoninvertibleTransformException

Constructs a map projection from the specified projection and affine transform. The SpheroidConstants and ProjectionConstants class should be consulted for valid parameter constants.

Parameters:

rMajor - the semi-major axis in meters.

dimensions - the dimensions of the data grid as [rows, columns].

affine - the affine transform for translating data [row, column] to map [x, y].

center_long - the (I) Center longitude.

falseEast - the false easting value.

falseNorth - the false northing value.

Throws:

NoninvertibleTransformException - if the map projection to data coordinate affine transform is not invertible.

IllegalArgumentException - if the paramaters have an inconsistency.

Method Details

projfor

protected long projfor(double lat,
 double lon,
 double[] x,
 double[] y)

Description copied from class: GCTPCStyleProjection

Performs the actual forward calculation as specified in the GCTP C code. This method is as close as possible to the native C function signature.

Specified by:

projfor in class GCTPCStyleProjection

Parameters:

lat - the latitude to convert.

lon - the longitude to convert.

x - the map coordinate x value (modified).

y - the map coordinate y value (modified).

Returns:

OK on success, or not OK on failure.

projinv

protected long projinv(double x,
 double y,
 double[] lon,
 double[] lat)

Description copied from class: GCTPCStyleProjection

Performs the actual inverse calculation as specified in the GCTP C code. This method is as close as possible to the native C function signature.

Specified by:

projinv in class GCTPCStyleProjection

Parameters:

x - the map coordinate x value (modified).

y - the map coordinate y value (modified).

lon - the longitude to convert.

lat - the latitude to convert.

Returns:

OK on success, or not OK on failure.