Make an alias for the snow composite in viirs

[mraspaud]

This is a workaround for #151, but also making sure the right channels are used for viirs.

Otherwise, DNB is used as the visible channel, and the nir reflectance computation mixes up resolutions.

• Tests passed

[ghost]

Congratulations 🍻. DeepCode analyzed your code in 0.399 seconds and we found no issues. Enjoy a moment of no bugs ☀️.

💬 This comment has been generated by the DeepCode bot, installed by the owner of the repository. The DeepCode bot protects your repository by detecting and commenting on security vulnerabilities or other critical issues.

---

☺️ If you want to provide feedback on our bot, here is how to contact us.

[coveralls]

Coverage decreased (-0.003%) to 89.324% when pulling bb4831a on mraspaud:fix-snow into ec24bcc on pytroll:master.

[coveralls]

Coverage decreased (-0.01%) to 89.313% when pulling 3527ad9 on mraspaud:fix-snow into ec24bcc on pytroll:master.

[mraspaud]

@djhoese @adybbroe (and others interested) do you agree that snow should be an alias for snow_lowres or should we take the high resolution by default ?

[djhoese]

I think we've been leaning towards the simplest name means the "best" version of that composite.

[mraspaud]

Works for me, fixing

[codecov]

Codecov Report

Merging #1116 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1116   +/-   ##
=======================================
  Coverage   89.32%   89.32%           
=======================================
  Files         197      197           
  Lines       28999    28999           
=======================================
  Hits        25904    25904           
  Misses       3095     3095

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ec24bcc...3527ad9. Read the comment docs.