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<h1 title="Package" class="title">Package healpix.essentials</h1>
<div class="docSummary">
<div class="block">Package implementing essential HEALPix functionality.<br>
healpix.essentials is a Java package aiming to combine the advantages
of other Java HEALPix libraries like
the gov.fnal.eag.healpix package by N.</div>
</div>
<p>See: <a href="#package.description">Description</a></p>
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<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
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<td class="colFirst"><a href="../../healpix/essentials/RangeSet.ValueIterator.html" title="interface in healpix.essentials">RangeSet.ValueIterator</a></td>
<td class="colLast">
<div class="block">Interface describing an iterator for going through all values in
a RangeSet object.</div>
</td>
</tr>
</tbody>
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<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../healpix/essentials/Compressor.html" title="class in healpix.essentials">Compressor</a></td>
<td class="colLast">
<div class="block">Class for compressing/uncompressing monotonous integer sequences.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/Constants.html" title="class in healpix.essentials">Constants</a></td>
<td class="colLast">
<div class="block">Some frequently used constants.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/FastMath.html" title="class in healpix.essentials">FastMath</a></td>
<td class="colLast">
<div class="block">FastMath class is a Java implementation of the
<a href="http://freecode.com/projects/sleef">SLEEF</a>
library.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/FitsUtil.html" title="class in healpix.essentials">FitsUtil</a></td>
<td class="colLast">
<div class="block">Basic FITS I/O support for Healpix maps.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/Fxyf.html" title="class in healpix.essentials">Fxyf</a></td>
<td class="colLast">
<div class="block">Class describing a location on the sphere</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixBase.html" title="class in healpix.essentials">HealpixBase</a></td>
<td class="colLast">
<div class="block">Basic opersations related to the HEALPix pixelisation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixMapDouble.html" title="class in healpix.essentials">HealpixMapDouble</a></td>
<td class="colLast">
<div class="block">Class representing a full HEALPix map containing double values.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixMapFloat.html" title="class in healpix.essentials">HealpixMapFloat</a></td>
<td class="colLast">
<div class="block">Class representing a full HEALPix map containing float values.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixProc.html" title="class in healpix.essentials">HealpixProc</a></td>
<td class="colLast">
<div class="block">Procedural interface to the <a href="../../healpix/essentials/HealpixBase.html" title="class in healpix.essentials"><code>HealpixBase</code></a> functionality.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixTables.html" title="class in healpix.essentials">HealpixTables</a></td>
<td class="colLast">
<div class="block">Various data tables needed by the <a href="../../healpix/essentials/HealpixBase.html" title="class in healpix.essentials"><code>HealpixBase</code></a> class.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/HealpixUtils.html" title="class in healpix.essentials">HealpixUtils</a></td>
<td class="colLast">
<div class="block">Collection of utility functions.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/Moc.html" title="class in healpix.essentials">Moc</a></td>
<td class="colLast">
<div class="block">Support for MOC algorithms.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/MocFitsIO.html" title="class in healpix.essentials">MocFitsIO</a></td>
<td class="colLast">
<div class="block">Moc FITS I/O routines.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/MocQuery.html" title="class in healpix.essentials">MocQuery</a></td>
<td class="colLast">
<div class="block">Support for MOC queries.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/MocQuery.MocQueryComponent.html" title="class in healpix.essentials">MocQuery.MocQueryComponent</a></td>
<td class="colLast"> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/MocStringIO.html" title="class in healpix.essentials">MocStringIO</a></td>
<td class="colLast">
<div class="block">Moc string I/O routines.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/Pointing.html" title="class in healpix.essentials">Pointing</a></td>
<td class="colLast">
<div class="block">An angular position on the unit sphere.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/RangeSet.html" title="class in healpix.essentials">RangeSet</a></td>
<td class="colLast">
<div class="block">Class for dealing with sets of integer ranges.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/Vec3.html" title="class in healpix.essentials">Vec3</a></td>
<td class="colLast">
<div class="block">Cartesian 3-vector.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><a href="../../healpix/essentials/Zphi.html" title="class in healpix.essentials">Zphi</a></td>
<td class="colLast">
<div class="block">Class for storing a position on the unit sphere as a (z,phi)-tuple.</div>
</td>
</tr>
</tbody>
</table>
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<caption><span>Enum Summary</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Enum</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
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<td class="colFirst"><a href="../../healpix/essentials/MocQuery.MocQueryOp.html" title="enum in healpix.essentials">MocQuery.MocQueryOp</a></td>
<td class="colLast"> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a href="../../healpix/essentials/Scheme.html" title="enum in healpix.essentials">Scheme</a></td>
<td class="colLast">
<div class="block">The Healpix pixel ordering scheme.</div>
</td>
</tr>
</tbody>
</table>
</li>
</ul>
<a name="package.description">
<!-- -->
</a>
<h2 title="Package healpix.essentials Description">Package healpix.essentials Description</h2>
<div class="block">Package implementing essential HEALPix functionality.<br>
healpix.essentials is a Java package aiming to combine the advantages
of other Java HEALPix libraries like
the gov.fnal.eag.healpix package by N. Kuropatkin
(<a href="http://home.fnal.gov/~kuropat/HEALPIX/PixTools.html">http://home.fnal.gov/~kuropat/HEALPIX/PixTools.html</a>),
Jan Kotek's org.asterope.healpix package
(<a href="https://github.com/jankotek/HEALPix">https://github.com/jankotek/HEALPix</a>),
and the healpix.core package developed at ESO.
<br>
Current features include:
<ul>
<li>close similarities with Healpix_Base_T class from Healpix C++, which allows
simultaneous development and bug fixes for both.
<li>support for arbitrary positive Nside values in RING scheme; no longer
limited to powers of 2
<li>maximum supported Nside value: 2^29
<li>significant performance improvements: most methods have been accelerated
by integral factors, some by more than an order of magnitude.
<li>re-implementation of queryDisc and queryPolygon:
<ul>
<li> query methods return RangeSet objects which allow much more compact
storage of the result
<li> new native query methods for NESTED ordering; these are slower than those
for RING ordering, but much quicker than converting all pixels from a RING
result to NESTED.
<li> inclusive queries have been improved: several bugs were fixed, and the
number of false positives in the result has been reduced. Users can now
choose between quick inclusive queries returning more false positives,
and slower ones returning fewer false positives.
</ul>
<li> the HealpixProc class offers a procedural (instead of object-oriented)
interface to the HealpixBase functionality, which simplifies transition
for users of the "Healpix" and "PixTools" classes.
NOTE: this only works for Nside parameters which are powers of 2
<li> many bug fixes
<li> no external library dependencies, except for "nom.tam.fits" if FITS I/O is
required
<li> the code base is thread-safe in the following sense:
<ul>
<li> HealpixProc methods can be called concurrently
<li> HealpixBase methods can be called concurrently on different objects
</ul>
</ul></div>
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