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1) dunno, wouldn't mind if i were you

2) mapping_default.launch. Yes, also launch hokuyo node and make sure the scan topics are the same.

3) Afaik hector mapping doesn't use imu data (might be that they added that over the last year though).

4)I think it's nicer to create a new launch file which includes hector mapping and sets the accordings args. However both ways will work.

Also make sure your tf tree is correct (i.e. do http://wiki.ros.org/hector_slam/Tutorials/SettingUpForYourRobot)

1) dunno, wouldn't mind if i were you

2) mapping_default.launch. Yes, also launch hokuyo node and make sure the scan topics are the same.

3) Afaik hector mapping doesn't use imu data (might be that they added that over the last year though).

4)I think it's nicer to create a new launch file which includes hector mapping and sets the accordings according args. However both ways will work.

Also make sure your tf tree is correct (i.e. do http://wiki.ros.org/hector_slam/Tutorials/SettingUpForYourRobot)