Method valueAt

src/grids.cpp:1459–1461

    ~GTiffVGrid() override;

    bool valueAt(int x, int y, float &out) const override {
        return m_grid->valueAt(m_idxSample, x, y, out);
    }

    bool isNodata(float val, double /* multiplier */) const override {
        return m_grid->isNodata(val);