Subversion Repositories public iLand

/********************************************************************************************

**    iLand - an individual based forest landscape and disturbance model

**    http://iland.boku.ac.at

**    Copyright (C) 2009-  Werner Rammer, Rupert Seidl

**

**    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 GNU General Public License

**    along with this program.  If not, see <http://www.gnu.org/licenses/>.

********************************************************************************************/

#include "grasscover.h"

#include "globalsettings.h"

#include "debugtimer.h"

#include "xmlhelper.h"

#include "model.h"

#include "modelcontroller.h"

GrassCover::GrassCover()

{

    mLayers = new GrassCoverLayers();

    mLayers->setGrid(mGrid, this);

    mEnabled = false;

    mType = Invalid;

}

GrassCover::~GrassCover()

{

    delete mLayers;

}

void GrassCover::setup()

{

    XmlHelper xml=GlobalSettings::instance()->settings();

    if (!xml.valueBool("model.settings.grass.enabled")) {

        // clear grid

        mGrid.clear();

        GlobalSettings::instance()->controller()->removeLayers(mLayers);

        mEnabled=false;

        qDebug() << "grass module not enabled";

        return;

    }

    // create the grid

    mGrid.setup(GlobalSettings::instance()->model()->grid()->metricRect(), GlobalSettings::instance()->model()->grid()->cellsize());

    mGrid.wipe();

    // mask out out-of-project areas

    HeightGrid *hg = GlobalSettings::instance()->model()->heightGrid();

    for (int i=0;i<mGrid.count();++i)

        if (!hg->valueAtIndex(mGrid.index5(i)).isValid())

            mGrid[i] = -1;

    mType = Invalid;

    QString type = xml.value("model.settings.grass.type");

    if (type == QStringLiteral("pixel"))

        mType = Pixel;

    if (type==QStringLiteral("continuous"))

        mType = Continuous;

    if (mType == Invalid)

        throw IException("GrassCover::setup: invalid 'grass.type'. Allowed: 'continous' and 'pixel'.");

    if (mType == Pixel) {

        // setup of pixel based / discrete approach

        QString formula = xml.value("model.settings.grass.grassDuration");

        if (formula.isEmpty())

            throw IException("GrassCover::setup(): missing equation for 'grassDuration'.");

        mPDF.setup(formula, 0., 100.);

        //mGrassEffect.setExpression(formula);

        mGrassLIFThreshold = static_cast<float>( xml.valueDouble("model.settings.grass.LIFThreshold", 0.2) );

        // clear array

        for (int i=0;i<GRASSCOVERSTEPS;++i) {

            mEffect[i] = 0.;

        }

    } else {

        // setup of continuous grass concept

        QString formula = xml.value("model.settings.grass.grassPotential");

        if (formula.isEmpty())

            throw IException("setup of 'grass': required expression 'grassPotential' is missing.");

        mGrassPotential.setExpression(formula);

        mGrassPotential.linearize(0.,1., qMin(GRASSCOVERSTEPS, 1000));

        formula = xml.value("model.settings.grass.grassEffect");

        if (formula.isEmpty())

            throw IException("setup of 'grass': required expression 'grassEffect' is missing.");

        mGrassEffect.setExpression(formula);

        mMaxTimeLag = static_cast<int>( xml.valueDouble("model.settings.grass.maxTimeLag") );

        if (mMaxTimeLag==0)

            throw IException("setup of 'grass': value of 'maxTimeLag' is invalid or missing.");

        mGrowthRate = GRASSCOVERSTEPS / mMaxTimeLag;

        // set up the effect on regeneration in NSTEPS steps

        for (int i=0;i<GRASSCOVERSTEPS;++i) {

            double effect = mGrassEffect.calculate(i/double(GRASSCOVERSTEPS-1));

            mEffect[i] = limit(effect, 0., 1.);

        }

        mMaxState = static_cast<qint16>( limit(mGrassPotential.calculate(1.f), 0., 1.)*(GRASSCOVERSTEPS-1)  ); // the max value of the potential function

    }

    GlobalSettings::instance()->controller()->addLayers(mLayers, QStringLiteral("grass cover"));

    mEnabled = true;

    qDebug() << "setup of grass cover complete.";

}

void GrassCover::setInitialValues(const QVector<float *> &LIFpixels, const int percent)

{

    if (!enabled())

        return;

    if (mType == Continuous) {

        grass_grid_type cval = static_cast<grass_grid_type>( limit(percent / 100., 0., 1.)*(GRASSCOVERSTEPS-1) );

        if (cval > mMaxState)

            cval = mMaxState;

        Grid<float> *lif_grid = GlobalSettings::instance()->model()->grid();

        for (QVector<float *>::const_iterator it = LIFpixels.constBegin(); it!=LIFpixels.constEnd(); ++it)

            mGrid.valueAtIndex(lif_grid->indexOf(*it)) = cval;

    } else {

        // mType == Pixel

        Grid<float> *lif_grid = GlobalSettings::instance()->model()->grid();

        for (QVector<float *>::const_iterator it = LIFpixels.constBegin(); it!=LIFpixels.constEnd(); ++it) {

            if (percent > irandom(0,100))

                mGrid.valueAtIndex(lif_grid->indexOf(*it)) = static_cast<qint16>( mPDF.get() );

            else

                mGrid.valueAtIndex(lif_grid->indexOf(*it)) = 0;

        }

    }

}

void GrassCover::execute()

{

    if (!enabled())

        return;

    DebugTimer t("GrassCover");

    // Main function of the grass submodule

    float *lif = GlobalSettings::instance()->model()->grid()->begin();

    float *end_lif = GlobalSettings::instance()->model()->grid()->end();

    grass_grid_type *gr = mGrid.begin();

    if (mType == Continuous) {

        // loop over every LIF pixel

        int skipped=0;

        for (; lif!=end_lif;++lif, ++gr) {

            // calculate potential grass vegetation cover

            if (*lif == 1.f && *gr==mMaxState) {

                ++skipped;

                continue;

            }

            int potential = static_cast<int>( limit(mGrassPotential.calculate(*lif), 0., 1.)*(GRASSCOVERSTEPS-1) );

            *gr = static_cast<qint16>( qMin( int(*gr) + mGrowthRate, potential) );

        }

        //qDebug() << "skipped" << skipped;

    } else {

        // type = Pixel

        for (; lif!=end_lif;++lif, ++gr) {

            if (*gr<0)

                continue;

            if (*gr>1)

                (*gr)--; // count down the years (until gr=1)

            if (*gr==0 && *lif>mGrassLIFThreshold) {

                // enable grass cover

                qint16 v = static_cast<qint16>( qMax(mPDF.get(), 0.) );

                *gr = v + 1; // switch on...

            }

            if (*gr==1 && *lif<mGrassLIFThreshold) {

                // now LIF is below the threshold - this enables the pixel get grassy again

                *gr = 0;

            }

        }

    }

}

double GrassCoverLayers::value(const grass_grid_type &data, const int index) const

{

    if (!mGrassCover->enabled()) return 0.;

    switch(index){

    case 0: return mGrassCover->effect(data); //effect

    case 1: return mGrassCover->cover(data); // cover

    default: throw IException(QString("invalid variable index for a GrassCoverLayers: %1").arg(index));

    }

}

const QVector<LayeredGridBase::LayerElement> &GrassCoverLayers::names()

{

    if (mNames.isEmpty())

        mNames = QVector<LayeredGridBase::LayerElement>()

                << LayeredGridBase::LayerElement(QLatin1Literal("effect"), QLatin1Literal("prohibiting effect on regeneration [0..1]"), GridViewGreens)

                << LayeredGridBase::LayerElement(QLatin1Literal("cover"), QLatin1Literal("current grass cover on pixels [0..1 for continuous, or #(years+2) for pixel mode]"), GridViewGreens);

    return mNames;

}