Issue:

StitchEE uses mirror_step variable to sort granules but l2ss removes mirror_step from the output when variable subsetting is requested.

Solutions:

• Request l2ss to always include mirror_step and xtrack, similarly to longitude and latitude logic:
  • Cons: also makes this approach very TEMPO specific
• Request EDS client to revise their variable subsetting interface by removing non-optional variables from selection and pass Harmony requests always including these variables:
  • Cons: direct access to Harmony API or via harmony-py would still allow user to remove non-optional variables
• Discuss other solutions: creating additional flag for non-optional variables to be passed by Harmony to the services?

Workaround

• Use longitude, filename or time to sort granules