SWE: calculate phase space density

[tech3371]

Change Summary

closes #884

Overview

Function to calculate SWE L2 phase space density. I used lot of ideas Greg suggested before leave.

Updated Files

• imap_processing/swe/l1b/swe_l1b_science.py
  • update caused from refactor code
• imap_processing/swe/l2/swe_l2.py
  • main changes to calculate phase space density
• imap_processing/swe/utils/swe_utils.py
  • refactor way of reading in lookup table

Testing

• imap_processing/tests/swe/test_swe_l2.py
  • added test for new function

[maxinelasp]

LGTM, although I'm not super familiar with the rest of the code base. I appreciate the use of dataframes rather than dicts.

[maxinelasp]

Should these constants be in a swe constants.py type file? Fine if they're only used here, just wanted to ask

[tech3371]

This is a temporary storage. I image these going into instrument status summary. Right now, it's only used here. I will keep constants.py idea in mind if we use this in another place later on.

[tech3371]

LGTM, although I'm not super familiar with the rest of the code base. I appreciate the use of dataframes rather than dicts.

Thank you for quick review. I know you just go back.

dataframes ideas credit goes to Greg. I was not happy with what I had before and asked Greg for ideas. He was the one who suggested getting everything in same shape to simplify mathematical operations.