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Mouseposition on heightmap

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Hi! I like to read the mouseposition on a heightmap but it doesn''t work. Here is the code to read the mouseposition after drawing:
    GLdouble winz;
    glReadPixels(MouseX, MouseY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winz);
    GLdouble objx, objy, objz;
    GLint viewport[4];
    GLdouble modelMatrix[16];
    GLdouble projMatrix[16];

    glGetIntegerv(GL_VIEWPORT, viewport);
    glGetDoublev(GL_MODELVIEW_MATRIX, modelMatrix);
    glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);

    gluUnProject((GLdouble)MouseX, (GLdouble)MouseY, winz, modelMatrix, projMatrix, viewport, &objx, &objy, &objz);

    double x = objx;
    double y = objy;
    double z = objz;

    SetWindowText(g_window->hWnd, (FloatToStr(float(x)) + " - " + FloatToStr(float(y)) + " - " + FloatToStr(z)).c_str());  
If I follow a line with my mouse the Y-Position shouldn''t change but it does. (Even if there is no different height on the heightmap) Is there maybe an example how to read the mouseposition ?

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