map-display/geospatialanalysis.cpp


#include "geospatialanalysis.h"
#include <QMessageBox>

GeoSpatialAnalysis::GeoSpatialAnalysis()
{

}

/*@brief 两点间的可视性
 * @param pntView 观察点
 * @param pntObject 目标点
 * @param relativeAltitude 飞机相对高度，默认值为0
 * @tolerance 误差容限
 */
UG3DAnalyst::SingleResult *GeoSpatialAnalysis::DoublePointVisibility(QMapControl* pMapControl,UGPoint2D pntView, UGPoint2D pntObject,double relativeAltitude,int tolerance)
{
    //通过下面的方法首先判断点所在的位置是否存在高程数据；
    UGDatasetRasterPtr viewPtDataset = pMapControl->getDemDataSet(pntView);
    UGDatasetRasterPtr objectPtDataset = pMapControl->getDemDataSet(pntObject);

    if(viewPtDataset == NULL || objectPtDataset == NULL)
    {
        QMessageBox::about(NULL,"提示","无高程数据 ");
        return NULL;//-1
    }

    if(viewPtDataset != objectPtDataset)
    {
        QMessageBox::about(NULL,"提示","观测点与被观测点不属于同一个高程数据集 ");
        return NULL;//-1
    }

    UGDatasetRasterPtr datasetRaster = viewPtDataset;

    //3D分析分析实例对象
    UG3DAnalyst visAnalsyt;
    UGPoint3D pntView3D,pntObject3D;

    //高程值需根据x,y查询数据集得到
    //得到当前测量点的高程值
    // 1.首先将坐标点转换为栅格数据集对应的行和列
    UGPoint pntviewImg;//观察点
    double altitude;//地形高度
    datasetRaster->XYToImg(pntView,pntviewImg);
    altitude = datasetRaster->GetValue(pntviewImg.x,pntviewImg.y);
    pntView3D.x = pntView.x;
    pntView3D.y = pntView.y;
//    pntView3D.z = altitude + relativeAltitude - tolerance;
    pntView3D.z = relativeAltitude - tolerance; //用于测试，把相对高度当成海拔高度

    //目标点
//    UGPoint pntObjectImg;
//    //坐标点转换为栅格数据集对应的行和列
//    datasetRaster->XYToImg(pntObject,pntObjectImg);
//    altitude = datasetRaster->GetValue(pntObjectImg.x,pntObjectImg.y);
    pntObject3D.x = pntObject.x;
    pntObject3D.y = pntObject.y;
    pntObject3D.z = pntView3D.z;

    //进行通视分析查询；
    UG3DAnalyst::SingleResult* result = visAnalsyt.IsVisible(datasetRaster,pntView3D,pntObject3D);

    return result;

}