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/********************************************************************** * * GEOS - Geometry Engine Open Source * http://geos.osgeo.org * * Copyright (C) 2020 Sandro Santilli * * This is free software; you can redistribute and/or modify it under * the terms of the GNU Lesser General Public Licence as published * by the Free Software Foundation. * See the COPYING file for more information. * ********************************************************************** * * Last Port: operation/overlayng/ElevationModel.java 4c88fea52 * **********************************************************************/ #pragma once #include #include // for composition // Forward declarations namespace geos { namespace geom { class Geometry; } } namespace geos { // geos. namespace operation { // geos.operation namespace overlayng { // geos.operation.overlayng /** * \brief * A simple elevation model used to populate missing Z values * in overlay results. * * The model divides the extent of the input geometry(s) * into an NxM grid. * The default grid size is 3x3. * If the input has no extent in the X or Y dimension, * that dimension is given grid size 1. * The elevation of each grid cell is computed as the average of the Z * values * of the input vertices in that cell (if any). * If a cell has no input vertices within it, it is assigned * the average elevation over all cells. * * If no input vertices have Z values, the model does not assign a Z * value. * * The elevation of an arbitrary location is determined as the * Z value of the nearest grid cell. * * An elevation model can be used to populate missing Z values * in an overlay result geometry. * * @author Martin Davis * */ class GEOS_DLL ElevationModel { private: class ElevationCell { private: int numZ = 0; double sumZ = 0.0; double avgZ; public: bool isNull() const { return numZ == 0; } void add(double z) { ++numZ; sumZ += z; } void compute() { avgZ = DoubleNotANumber; if (numZ > 0) avgZ = sumZ / numZ; } double getZ() const { return avgZ; } }; static const int DEFAULT_CELL_NUM; geom::Envelope extent; int numCellX; int numCellY; double cellSizeX; double cellSizeY; std::vector cells; bool isInitialized = false; bool hasZValue = false; double averageZ = DoubleNotANumber; void init(); ElevationCell& getCell(double x, double y); //, bool isCreateIfMissing); int getCellOffset(int ix, int iy) { return (numCellX * iy + ix); } protected: void add(double x, double y, double z); public: static std::unique_ptr create(const geom::Geometry& geom1, const geom::Geometry& geom2); static std::unique_ptr create(const geom::Geometry& geom1); ElevationModel(const geom::Envelope& extent, int numCellX, int numCellY); void add(const geom::Geometry& geom); /** * Gets the model Z value at a given location. * If the location lies outside the model grid extent, * this returns the Z value of the nearest grid cell. * If the model has no elevation computed (i.e. due * to empty input), the value is returned as a double NaN. * * @param x the x ordinate of the location * @param y the y ordinate of the location * @return the computed model Z value */ double getZ(double x, double y); /** * \brief * Computes Z values for any missing Z values in a geometry, * using the computed model. * * If the model has no Z value, or the geometry coordinate dimension * does not include Z, no action is taken. * * @param geom the geometry to elevate */ void populateZ(geom::Geometry& geom); }; } // namespace geos.operation.overlayng } // namespace geos.operation } // namespace geos