Hi Pooja,
Thank you so much! I'm thrilled to hear you got it working. I fixed the transforms in test_bag.launch; all the correct transforms should now be published.
If you already have a map server running, you simply need to input the initial pose of the robot in the map as a transform between the /pgraph and /map frames as a static tf transform publisher, which can be done in the launch file (see below) or as a separate node that takes the initial pose as an input from somewhere (i.e., initialpose topic from rviz) and publishes it to tf.

<node name="pgraph_tf_publisher" pkg="tf" type="static_transform_publisher" args="-30 -5 0.0 0.0 0.0 -0.37 0.92 /pgraph /map 50" />

Please let me know if you have any more issues.
Thanks,
Helen

On Mon, Aug 23, 2010 at 2:18 PM, poojav <poojavish@gmail.com> wrote:

This tutorial was fantastic! We did manage to get stereo_vslam working with
our own live data.  Now, we'd like to visualize our visual odometry results
on a laser map we have of our lab.  I tried to initially just visualize on
top of the willow garage map using the test_bag.launch file (which works
perfectly with the tutorial vslam bag), changing group ns=wide_stereo to our
camera name, as we did in stereo_vslam, and running wgf_slam.vcg in rviz.
However, this does not work since it looks like we're missing some of the tf
data published by the tutorial bag.  Would you be able to tell us what data
we need to display visual odometry on a map, and how to go about publishing
this data?  Thanks!
--
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