skyview.survey

Class HealPixImage

java.lang.Object

skyview.survey.Image

skyview.survey.HealPixImage

All Implemented Interfaces:

java.io.Serializable, Component

public class HealPixImage
extends Image

This class defines an image gotten by reading a HEALPix image where the pixels are in the nested pixel order. This assumes the FITS structures found in the WMAP data but could be adapted to other orders as needed. There are several HEALPix formats supported: A single HEALPix intensity array in the primary HDU HEALPix data in the first extension HDU as a binary table with each row in the table corresponding to a single pixel. This format can support multiple HEALPix Stokes parameter values per pixel, in particular I, Q and U and be read from the file and the derived quantities PI, PI/I, and PA can be returned if the I,Q,U are present. A single HEALPix intensity array stored in the first extension with R rows, where each row in the table has an array of N values representing RxN pixels. A HEALPix file which has been split into multiple tiles. These tiles will be read as needed.

See Also:

Serialized Form

Field Summary

Fields inherited from class skyview.survey.Image

data

Constructor Summary

Constructors

Constructor and Description
HealPixImage(java.lang.String file)

Method Summary

Modifier and Type	Method and Description
double	getData(long ipix) Get a single element of data
double[]	getDataArray() Probably should happen, but just in case we support the get array function.
int	getDepth() Only a scalar image.
int	getHeight() Get the height of the image in pixels
int	getWidth() Get the width of the image in pixels
void	setData(long npix, double val) Support changing the data! Probably won't use this...

Methods inherited from class skyview.survey.Image

clearData, getBaseImage, getCenter, getCorners, getDescription, getName, getTransformer, getWCS, initialize, isTiled, setAccumulate, setDataArray, setName, valid, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

HealPixImage

public HealPixImage(java.lang.String file)
             throws SurveyException

Throws:

SurveyException

Method Detail

getWidth

public int getWidth()

Get the width of the image in pixels

Overrides:

getWidth in class Image

getHeight

public int getHeight()

Get the height of the image in pixels

Overrides:

getHeight in class Image

getDepth

public int getDepth()

Only a scalar image. Note that if we are returning a PA image then this does not transform simply when we change coordinates. This is really a vector.

Overrides:

getDepth in class Image

getData

public double getData(long ipix)

Get a single element of data

Overrides:

getData in class Image

getDataArray

public double[] getDataArray()

Probably should happen, but just in case we support the get array function.

Overrides:

getDataArray in class Image

setData

public void setData(long npix,
                    double val)

Support changing the data! Probably won't use this...

Overrides:

setData in class Image