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java.lang.Objectuk.ac.starlink.table.join.HealpixSkyPixellator
public abstract class HealpixSkyPixellator
Implements sky pixellisation using the HEALPix scheme. This works better than the HTM-based one for two reasons:
Constructor Summary | |
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protected |
HealpixSkyPixellator(int maxK)
Constructor. |
Method Summary | |
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abstract int |
calculateDefaultK(double scale)
Determines a default value to use for the HEALPix k parameter based on a given scale. |
protected abstract void |
configureK(int k)
Updates internal state for the current value of the k parameter. |
int |
getHealpixK()
Returns the HEALPix k value, which determines sky pixel size, equivalent to log2(nside). |
int |
getMaxK()
Returns the maximum permissible K value. |
double |
getScale()
Returns the most recently set angular scale. |
DescribedValue |
getTuningParameter()
Returns a parameter whose value may be adjusted to alter the pixellisation scale. |
void |
setHealpixK(int healpixK)
Sets the HEALPix k value, which determines sky pixel size, equivalent to log2(nside). |
void |
setScale(double scale)
Sets the characteristic angular scale for this pixellator. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface uk.ac.starlink.table.join.SkyPixellator |
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getPixels |
Constructor Detail |
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protected HealpixSkyPixellator(int maxK)
maxK
- the maximum K value permitted by this implementationMethod Detail |
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public int getMaxK()
public void setScale(double scale)
SkyPixellator
setScale
in interface SkyPixellator
scale
- pixel length scale in radianspublic double getScale()
SkyPixellator
getScale
in interface SkyPixellator
public DescribedValue getTuningParameter()
SkyPixellator
getTuningParameter
in interface SkyPixellator
public void setHealpixK(int healpixK)
getMaxK()
.
If set to -1, a suitable value will be used based on the scale.
healpixK
- new k valuepublic int getHealpixK()
protected abstract void configureK(int k)
k
- HEALPix orderpublic abstract int calculateDefaultK(double scale)
scale
- distance scale, in radians
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