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'No map received' in RVIZ when using a custom costmap2d-layer as plugin

asked 2020-06-03 01:11:18 -0600

Zimba96 gravatar image

Hello there,

I'm having an occupancy grid which has intermediate values from 1-100 and want it to be transformed to a costmap with also intermediate values. I've noticed that this doesn't seem to be possible with the given layers (static layer, inflation layer, obstacle layer, ...)

Therefore, I tried to write a custom layer for which I took the source code of the static_layer and replaced the interpretValue-function in order to map the 100 values of the occupancygrid to the 255 values of the costmap. I integrated my custom plugin into the global_costmap_params.yaml and the system appears to properly load the plugin (at least there are no further errors or warnings that it couldn't be loaded).

The problem is: In RVIZ the global costmap - section throws a warning which says "No map received" (The Topic is '/move_base/global_costmap/costmap' which works fine when static_layer is set as plugin). As a result of that, I can only see the coordinate system, but no map.

I'm using ROS Melodic.

Plugin source code (occgrid_to_costmap_layer.cpp):


#include <ros/ros.h>
#include <costmap_2d/costmap_layer.h>
#include <costmap_2d/layered_costmap.h>
#include <costmap_2d/GenericPluginConfig.h>
#include <costmap_2d/static_layer.h>
#include <costmap_2d/costmap_math.h>
#include <tf2/LinearMath/Transform.h>
#include <dynamic_reconfigure/server.h>
#include <nav_msgs/OccupancyGrid.h>
#include <map_msgs/OccupancyGridUpdate.h>
#include <message_filters/subscriber.h>
#include <pluginlib/class_list_macros.h>

 PLUGINLIB_EXPORT_CLASS(occgrid_to_costmap_layer_namespace::OTCLayer, costmap_2d::Layer)

using costmap_2d::NO_INFORMATION;
using costmap_2d::LETHAL_OBSTACLE;
using costmap_2d::FREE_SPACE;

namespace occgrid_to_costmap_layer_namespace

OTCLayer::OTCLayer() : dsrv_(NULL) {}

  if (dsrv_)
    delete dsrv_;

void OTCLayer::onInitialize()
  ros::NodeHandle nh("~/" + name_), g_nh;
  current_ = true;

  global_frame_ = layered_costmap_->getGlobalFrameID();

  std::string map_topic;
  nh.param("map_topic", map_topic, std::string("map"));
  nh.param("first_map_only", first_map_only_, false);
  nh.param("subscribe_to_updates", subscribe_to_updates_, false);

  nh.param("track_unknown_space", track_unknown_space_, true);
  nh.param("use_maximum", use_maximum_, false);

  int temp_lethal_threshold, temp_unknown_cost_value;
  nh.param("lethal_cost_threshold", temp_lethal_threshold, int(100));
  nh.param("unknown_cost_value", temp_unknown_cost_value, int(-1));
  nh.param("trinary_costmap", trinary_costmap_, true);

  lethal_threshold_ = std::max(std::min(temp_lethal_threshold, 100), 0);
  unknown_cost_value_ = temp_unknown_cost_value;

  // Only resubscribe if topic has changed
  if (map_sub_.getTopic() != ros::names::resolve(map_topic))
    // we'll subscribe to the latched topic that the map server uses
    ROS_INFO("Requesting the map...");
    map_sub_ = g_nh.subscribe(map_topic, 1, &OTCLayer::incomingMap, this);
    map_received_ = false;
    has_updated_data_ = false;

    ros::Rate r(10);
    while (!map_received_ && g_nh.ok())

    ROS_INFO("Received a %d X %d map at %f m/pix", getSizeInCellsX(), getSizeInCellsY(), getResolution());

    if (subscribe_to_updates_)
      ROS_INFO("Subscribing to updates");
      map_update_sub_ = g_nh.subscribe(map_topic + "_updates", 10, &OTCLayer::incomingUpdate, this);

    has_updated_data_ = true;

  if (dsrv_)
    delete dsrv_;

  dsrv_ = new dynamic_reconfigure::Server<costmap_2d::GenericPluginConfig>(nh);
  dynamic_reconfigure::Server<costmap_2d::GenericPluginConfig>::CallbackType cb = boost::bind(
      &OTCLayer::reconfigureCB, this, _1, _2);

void OTCLayer::reconfigureCB(costmap_2d::GenericPluginConfig &config, uint32_t level)
  if (config.enabled != enabled_)
    enabled_ = config.enabled;
    has_updated_data_ = true;
    x_ = y_ = 0;
    width_ = size_x_;
    height_ = size_y_;

void OTCLayer::matchSize()
  // If we are using rolling costmap, the static map size is
  //   unrelated to the size of the layered costmap
  if (!layered_costmap_->isRolling())
    Costmap2D* master = layered_costmap_->getCostmap();
    resizeMap(master->getSizeInCellsX(), master->getSizeInCellsY(), master->getResolution(),
              master->getOriginX(), master->getOriginY());

unsigned char OTCLayer::interpretValue(unsigned char ...
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Doesn't answer your direct question, but have you tried setting trinary_costmap to false?

David Lu gravatar image David Lu  ( 2020-06-04 17:03:43 -0600 )edit

I just figured out that the main problem is that my plugins somehow aren't able to read the params from the global_costmap_params.yaml (see my answer). Any ideas on how to fix that? Thanks for your answer btw!

Zimba96 gravatar image Zimba96  ( 2020-06-05 06:33:23 -0600 )edit

Btw, the reason that I wrote this custom plugin was, that the static_map couldn't represent intermediate values by setting the trinary_costmap-param. Turned out that it was the same issue: Instead of using the set trinary_costmap-value "false" of the global_costmap_params.yaml it somehow always used the default-value "true". Manually changing the default value solved the problem..

Zimba96 gravatar image Zimba96  ( 2020-06-05 06:41:04 -0600 )edit

1 Answer

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answered 2020-06-05 06:38:03 -0600

Zimba96 gravatar image

Turned out the plugins somehow aren't able to read the given params from global_costmap_params.yaml. Changing the default-value from

nh.param("map_topic", map_topic, std::string("map"));


nh.param("map_topic", map_topic, std::string("insert_required_topic_here"));

solved the issue.

Since this isn't the clean way to do it, any ideas what could be the causes that the plugin doesn't read the params properly?

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I would run rosparam get /move_base and make sure parameters are being loaded where you think they are being loaded. Failing that, post them here.

David Lu gravatar image David Lu  ( 2020-06-05 16:53:44 -0600 )edit

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Asked: 2020-06-03 01:11:18 -0600

Seen: 853 times

Last updated: Jun 05 '20