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Try with this parameters:

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

 <!-- Frame names -->
 <param name="base_frame" value="base_link" />
 <param name="odom_frame" value="base_link" />
 <param name="output_timing" value="false"/>

 <param name="map_frame" value="map" />

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

 <!-- Map size / start point -->
 <param name="map_resolution" value="0.025"/>
 <param name="map_size" value="6000"/>
 <param name="map_start_x" value="0.5"/>
 <param name="map_start_y" value="0.5" />
 <param name="map_pub_period" value="1"/>
 <param name="laser_max_dist" value="20" />
 <param name="laser_z_min_value" value="-2.5" />
 <param name="laser_z_max_value" value="7.5" />
 <param name="update_factor_free" value="0.4"/>
 <param name="update_factor_occupied" value="0.7" />    
 <param name="map_update_distance_thresh" value="0.2"/>
 <param name="map_update_angle_thresh" value="0.06" />


But the map also depend to the soft moves and the power of your CPU.