Incorrect Covariances

[goldbattle]

To my understanding, the ROS covariances should be the sensor deviation squared.
This is backwards in the current driver, here are the changes that need to be changed:

• rpng@4f764a8
• rpng@74f72dc

I also created a conversion script that will take a ROS bag, edits the covariances to be the correct values, and saves the converted bag file.
https://github.com/rpng/novatel_span_driver/blob/master/bag_fix_gps.py

Hope this helps people that run into this issue.

[JWhitleyWork]

Would you mind submitting this as a Pull Request?