hector slam not generating map

asked 2016-04-07 07:46:11 -0500

wmorlan gravatar image

updated 2016-04-07 09:35:33 -0500

For some reason, when I run hector_mapping, no map is generated. In rviz, no map appears when I try to view the /map topic. when I run "rosrun map_server map_saver", the result is a solid dark grey image. I have followed the instructions here when setting up my robot. http://wiki.ros.org/hector_slam/Tutor...

Edor: When building from logged data, the map builds fine. I therefore assume I am not generating the correct data somehow. Here is the launch file I am using to start everything; if somebody could tell me what I am doing wrong, that would be much appriciated

<?xml version="1.0"?>
    <include file="$(find openni2_launch)/launch/openni2.launch"/>
    <node pkg="depthimage_to_laserscan" type="depthimage_to_laserscan" name="depthimage_to_laserscan"> 
        <remap from="image" to="/camera/depth/image_raw"/>

    <node pkg="hector_mapping" type="hector_mapping" name="hector_mapping" output="screen">

        <!-- Frame names -->
        <param name="map_frame" value="map" />
        <param name="base_frame" value="camera_link" />
        <param name="odom_frame" value="camera_link" />

        <!-- Tf use -->
        <param name="use_tf_scan_transformation" value="true"/>
        <param name="use_tf_pose_start_estimate" value="false"/>
        <param name="pub_map_odom_transform" value="true"/>

        <!-- Map size / start point -->
        <param name="map_resolution" value="0.050"/>
        <param name="map_size" value="2048"/>
        <param name="map_start_x" value="0.5"/>
        <param name="map_start_y" value="0.5" />
        <param name="map_multi_res_levels" value="2" />

        <!-- Map update parameters -->
        <param name="update_factor_free" value="0.4"/>
        <param name="update_factor_occupied" value="0.9" />    
        <param name="map_update_distance_thresh" value="0.4"/>
        <param name="map_update_angle_thresh" value="0.06" />
        <param name="laser_z_min_value" value = "-1.0" />
        <param name="laser_z_max_value" value = "1.0" />
        <param name="laser_max_dist" value = "10" />

        <!-- Advertising config --> 
        <param name="advertise_map_service" value="true"/>

        <param name="scan_subscriber_queue_size" value="5"/>
        <param name="scan_topic" value="scan"/>

        <!-- Debug parameters -->
        <param name="output_timing" value="false"/>
        <param name="pub_drawings" value="true"/>
        <param name="pub_debug_output" value="true"/>
        <param name="tf_map_scanmatch_transform_frame_name" value="scanmatcher_frame" />
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Are you sure the scan topic has been published? Hector slam node is subscribing to topic called scan. So you need to make sure some node (probably depthimage_to_laserscan in your case) is publishing LaserScan msg to scan. Check details of scan by rostopic info /scan and rostopic echo /scan

DavidN gravatar image DavidN  ( 2016-04-10 21:29:36 -0500 )edit