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I found the answer looking into the gmapping code: https://code.ros.org/svn/ros-pkg/stacks/slam_gmapping/tags/slam_gmapping-1.2.5/gmapping/src/slam_gmapping.cpp

    map_.map.info.width = smap.getMapSizeX();
    map_.map.info.height = smap.getMapSizeY();
    map_.map.info.origin.position.x = xmin_;
    map_.map.info.origin.position.y = ymin_;
    map_.map.data.resize(map_.map.info.width * map_.map.info.height);

  }

  for(int x=0; x < smap.getMapSizeX(); x++)
  {
    for(int y=0; y < smap.getMapSizeY(); y++)
    {
      /// @todo Sort out the unknown vs. free vs. obstacle thresholding
      GMapping::IntPoint p(x, y);
      double occ=smap.cell(p);
      assert(occ <= 1.0);
      if(occ < 0)
        map_.map.data[MAP_IDX(map_.map.info.width, x, y)] = -1;
      else if(occ > occ_thresh_)
      {
        //map_.map.data[MAP_IDX(map_.map.info.width, x, y)] = (int)round(occ*100.0);
        map_.map.data[MAP_IDX(map_.map.info.width, x, y)] = 100;
      }
      else
        map_.map.data[MAP_IDX(map_.map.info.width, x, y)] = 0;
    }
  }

  //make sure to set the header information on the map
  map_.map.header.stamp = ros::Time::now();
  map_.map.header.frame_id = map_frame_;

  sst_.publish(map_.map);
  sstm_.publish(map_.map.info);

I didn't index correctly the data

(MAP_IDX(map_.map.info.width, x, y))

And also I wasn't publishing the metadata info in a separated topic. Thanks Lorenz for the idea ;)