ROS中的珊格地圖——nav_msgs::OccupancyGrid

一、Rviz中的地圖效果如下：

黑色塊爲障礙物，顏色較深的灰色塊爲危險區，顏色再淺一點的是可行區域，最淺的是未知區域（最外圍的區域）；

二、地圖數據格式

官方數據類型解釋如下：

# This represents a 2-D grid map, in which each cell represents the probability of
# occupancy.

Header header 

#MetaData for the map
MapMetaData info

# The map data, in row-major order, starting with (0,0).  Occupancy
# probabilities are in the range [0,100].  Unknown is -1.
int8[] data

# This hold basic information about the characterists of the OccupancyGrid

# The time at which the map was loaded
time map_load_time
# The map resolution [m/cell]
float32 resolution
# Map width [cells]
uint32 width
# Map height [cells]
uint32 height
# The origin of the map [m, m, rad].  This is the real-world pose of the
# cell (0,0) in the map.
geometry_msgs/Pose origin

柵格地圖中座標是一維數組的形式，比如實際地圖中某點座標爲(x,y)，對應柵格地圖中座標爲[x*map.info.width+y]。

三、實例代碼

ros::Publisher mapPub = nodeHandler.advertise<nav_msgs::OccupancyGrid>("laser_map", 1, true);

//發佈地圖．
void PublishMap(ros::Publisher &map_pub)
{
    nav_msgs::OccupancyGrid rosMap;

    rosMap.info.resolution = mapParams.resolution;
    rosMap.info.origin.position.x = 0.0;
    rosMap.info.origin.position.y = 0.0;
    rosMap.info.origin.position.z = 0.0;
    rosMap.info.origin.orientation.x = 0.0;
    rosMap.info.origin.orientation.y = 0.0;
    rosMap.info.origin.orientation.z = 0.0;
    rosMap.info.origin.orientation.w = 1.0;

    rosMap.info.origin.position.x = mapParams.origin_x;
    rosMap.info.origin.position.y = mapParams.origin_y;
    rosMap.info.width = mapParams.width;
    rosMap.info.height = mapParams.height;
    rosMap.data.resize(rosMap.info.width * rosMap.info.height);

    //0~100
    int cnt0, cnt1, cnt2;
    cnt0 = cnt1 = cnt2 = 100;
    for (int i = 0; i < mapParams.width * mapParams.height; i++)
    {
        if (pMap[i] == 50)
        {
            rosMap.data[i] = -1.0;
        }
        else
        {

            rosMap.data[i] = pMap[i];
        }
    }

    rosMap.header.stamp = ros::Time::now();
    rosMap.header.frame_id = "map";

    map_pub.publish(rosMap);
}

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