uk.ac.starlink.ttools.task

Class PixSample

java.lang.Object

uk.ac.starlink.ttools.task.ConsumerTask

uk.ac.starlink.ttools.task.MapperTask

uk.ac.starlink.ttools.task.PixSample

All Implemented Interfaces:

Task

public class PixSample
extends MapperTask

Samples data from a HEALPix pixel file.

Since:

6 Dec 2011

Author:

Mark Taylor

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	PixSample.CoordReader Interface to turn input coordinate values into coordinate values suitable for pixel sampling.

Constructor Summary

Constructors

Constructor and Description
PixSample() Constructor.

Method Summary

Modifier and Type	Method and Description
static PixSample.CoordReader	createCoordReader(SkySystem inSys, SkySystem outSys) Returns a coordinate reader which converts between a given input and output coordinate system.
static ColumnSupplement	createSampleSupplement(StarTable base, PixSampler pixSampler, PixSampler.StatMode statMode, PixSample.CoordReader coordReader, String lonExpr, String latExpr, String radExpr) Creates a table containing pixel samples corresponding to the rows of a base table in accordance with supplied parameters.

Methods inherited from class uk.ac.starlink.ttools.task.MapperTask

createProducer, getMapper, getTablesInput

Methods inherited from class uk.ac.starlink.ttools.task.ConsumerTask

createExecutable, createProducer, getIdentity, getOutputMode, getParameterList, getParameters, getPurpose

Methods inherited from class java.lang.Object

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

Constructor Detail

PixSample

public PixSample()

Constructor.

Method Detail

createSampleSupplement

public static ColumnSupplement createSampleSupplement(StarTable base,
                                                      PixSampler pixSampler,
                                                      PixSampler.StatMode statMode,
                                                      PixSample.CoordReader coordReader,
                                                      String lonExpr,
                                                      String latExpr,
                                                      String radExpr)
                                               throws IOException

Creates a table containing pixel samples corresponding to the rows of a base table in accordance with supplied parameters.

Parameters:

base - base table

pixSampler - characterises pixel sampling

coordReader - turns input coordinate pairs into lon/lat coords in the HEALPix coordinate system

lonExpr - JEL expression for first input coordinate

latExpr - JEL expression for second input coordinate

radExpr - JEL expression for averaging radius

Returns:

table containing sampled columns

Throws:

IOException

createCoordReader

public static PixSample.CoordReader createCoordReader(SkySystem inSys,
                                                      SkySystem outSys)

Returns a coordinate reader which converts between a given input and output coordinate system. If no conversion is required, use null for in/out systems.

Parameters:

inSys - input sky coordinate system

outSys - output sky coordinate system

Returns:

coordinate reader that converts