makeMatchStatistics.cc

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// -*- LSST-C++ -*-

/*
 * LSST Data Management System
 * Copyright 2008, 2009, 2010 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */

#include "lsst/pex/exceptions/Runtime.h"
#include "lsst/meas/astrom/makeMatchStatistics.h"

namespace lsst {
namespace meas {
namespace astrom {

template <typename MatchT>
afw::math::Statistics makeMatchStatistics(std::vector<MatchT> const& matchList, int const flags,
                                          afw::math::StatisticsControl const& sctrl) {
    if (matchList.empty()) {
        throw LSST_EXCEPT(pexExcept::RuntimeError, "matchList is empty");
    }
    std::vector<double> val;
    val.reserve(matchList.size());

    for (auto const& match : matchList) {
        val.push_back(match.distance);
    }
    return afw::math::makeStatistics(val, flags, sctrl);
}

template <typename MatchT>
afw::math::Statistics makeMatchStatisticsInPixels(afw::geom::SkyWcs const& wcs,
                                                  std::vector<MatchT> const& matchList, int const flags,
                                                  afw::math::StatisticsControl const& sctrl) {
    if (matchList.empty()) {
        throw LSST_EXCEPT(pexExcept::RuntimeError, "matchList is empty");
    }
    std::vector<double> val;
    val.reserve(matchList.size());

    for (auto const& match : matchList) {
        auto refPtr = match.first;
        auto srcPtr = match.second;
        auto srcX = srcPtr->getX();
        auto srcY = srcPtr->getY();
        auto refPos = wcs.skyToPixel(refPtr->getCoord());
        auto refX = refPos[0];
        auto refY = refPos[1];
        val.push_back(::hypot(srcX - refX, srcY - refY));
    }
    return afw::math::makeStatistics(val, flags, sctrl);
}

template <typename MatchT>
afw::math::Statistics makeMatchStatisticsInRadians(afw::geom::SkyWcs const& wcs,
                                                   std::vector<MatchT> const& matchList, int const flags,
                                                   afw::math::StatisticsControl const& sctrl) {
    if (matchList.empty()) {
        throw LSST_EXCEPT(pexExcept::RuntimeError, "matchList is empty");
    }
    std::vector<double> val;
    val.reserve(matchList.size());

    for (auto const& match : matchList) {
        auto refPtr = match.first;
        auto srcPtr = match.second;
        auto refCoord = refPtr->getCoord();
        auto srcCoord = wcs.pixelToSky(srcPtr->getCentroid());
        auto angSep = refCoord.separation(srcCoord);
        val.push_back(angSep.asRadians());
    }
    return afw::math::makeStatistics(val, flags, sctrl);
}

#define INSTANTIATE(MATCH)                                                                                \
    template afw::math::Statistics makeMatchStatistics<MATCH>(std::vector<MATCH> const& matchList,        \
                                                              int const flags,                            \
                                                              afw::math::StatisticsControl const& sctrl); \
    template afw::math::Statistics makeMatchStatisticsInPixels<MATCH>(                                    \
            afw::geom::SkyWcs const& wcs, std::vector<MATCH> const& matchList, int const flags,           \
            afw::math::StatisticsControl const& sctrl);                                                   \
    template afw::math::Statistics makeMatchStatisticsInRadians<MATCH>(                                   \
            afw::geom::SkyWcs const& wcs, std::vector<MATCH> const& matchList, int const flags,           \
            afw::math::StatisticsControl const& sctrl);

INSTANTIATE(afw::table::ReferenceMatch);
INSTANTIATE(afw::table::SourceMatch);

}  // namespace astrom
}  // namespace meas
}  // namespace lsst