org.proj4

Class Projections

java.lang.Object

org.proj4.Projections

Direct Known Subclasses:

LatLong, Others

public abstract class Projections
extends Object

superclass of all the projections the main proj methods are held here

Constructor Summary

Constructors

Constructor and Description
Projections()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	degreeToRadiant(double[] la, double[] lo) transform latitude and longitude from degree to radiant format
protected void	doTheTransform(Projections srcProj, ProjectionData dataTP, long point_count, int point_offset) do the transform.
String	getEllipseInfo() public method to call the native getEllispdInfo
protected String	getEllipsInfo(String proj) get the ellipsoid parameters from the projection code
String	getProjInfo() public method to call the native getProjInfo
protected String	getProjInfo(String proj) get all the projection informations needed from the projection code (reproduces pj_get_def() of the proj api)
LinkedHashMap	mapProjInfo() return all the proj info into a Linked Hashmap
abstract void	prepareData(ProjectionData dataTP) if there is some operation to perform on the input data, this is the right moment (ex.
abstract void	prepareTransformedData(ProjectionData dataTP) this takes care that the reprojected data are in the correct format (ex.
void	printProjInfo() print to standard output the proj info in a nice format
protected void	radiantToDegree(double[] la, double[] lo) transform latitude and longitude from radiant to degree format
protected void	transform(double[] firstCoord, double[] secondCoord, double[] values, String srcCodeString, String destCodeString, long pointcount, int pointoffset) native call to the reprojections routines of proj

Methods inherited from class java.lang.Object

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

Constructor Detail

Projections

public Projections()

Method Detail

getProjInfo

protected String getProjInfo(String proj)

get all the projection informations needed from the projection code (reproduces pj_get_def() of the proj api)

Parameters:

the - proj code or options

Returns:

the info String

getEllipsInfo

protected String getEllipsInfo(String proj)

get the ellipsoid parameters from the projection code

Parameters:

the - proj code or options

Returns:

the info String

transform

protected void transform(double[] firstCoord,
             double[] secondCoord,
             double[] values,
             String srcCodeString,
             String destCodeString,
             long pointcount,
             int pointoffset)

native call to the reprojections routines of proj

Parameters:

firstCoord - array of x

secondCoord - array of y

values - array of z

srcCodeString - source projection code or option

destCodeString - destination projection code or option

pointcount -

pointoffset -

getProjInfo

public String getProjInfo()

public method to call the native getProjInfo

Returns:

quoting the proj api:"Returns the PROJ.4 command string that would produce this definition expanded as much as possible. For instance, +init= calls and +datum= defintions would be expanded"

getEllipseInfo

public String getEllipseInfo()

public method to call the native getEllispdInfo

Returns:

the list of ellipsoid parameters

printProjInfo

public void printProjInfo()

print to standard output the proj info in a nice format

mapProjInfo

public LinkedHashMap mapProjInfo()

return all the proj info into a Linked Hashmap

prepareData

public abstract void prepareData(ProjectionData dataTP)

if there is some operation to perform on the input data, this is the right moment (ex. latlong from degree to radiant) -> i.e. do whatever is needed

Parameters:

dataTP -

doTheTransform

protected void doTheTransform(Projections srcProj,
                  ProjectionData dataTP,
                  long point_count,
                  int point_offset)

do the transform. The srcProjection is passed to the destination proj and the transformation takes place. Then the resulting transformed data are passed to the destProj, so that the destProj in case can take care of final transformation of data (ex. if the destProj is latlong, the values have to be set beck to degrees

Parameters:

srcProj - object holding the source projection

dataTP - the data set

point_count -

point_offset -

prepareTransformedData

public abstract void prepareTransformedData(ProjectionData dataTP)

this takes care that the reprojected data are in the correct format (ex. latlong has to be transformed back to radiant)

Parameters:

dataTP - the data set

degreeToRadiant

protected void degreeToRadiant(double[] la,
                   double[] lo)

transform latitude and longitude from degree to radiant format

Parameters:

la -

lo -

radiantToDegree

protected void radiantToDegree(double[] la,
                   double[] lo)

transform latitude and longitude from radiant to degree format

Parameters:

la -

lo -