int max_height = H2I(TGPGetMaxHeight());

    /* Transfer height map into OTTD map */
    for (int y = 0; y < _height_map.size_y; y++) {
        for (int x = 0; x < _height_map.size_x; x++) {
            TgenSetTileHeight(TileXY(x, y), Clamp(H2I(_height_map.height(x, y)), 0, max_height));
        }
    }

    int tile_count = 0, cur_height = 0;
    while (tile_count < _height_map.size_x * _height_map.size_y * 2 / 3 && cur_height <= max_height) {
        for (int y = 0; y < _height_map.size_y; y++) {
            for (int x = 0; x < _height_map.size_x; x++) {
                if (GetTileZ(TileXY(x, y)) == cur_height) tile_count++;
            }
        }
        cur_height++;
    }

    if (_settings_game.game_creation.landscape == LT_ARCTIC) {
        _settings_game.game_creation.snow_line_height = Clamp(cur_height, MIN_SNOWLINE_HEIGHT, MAX_SNOWLINE_HEIGHT);
    }