Read.netcdf to image classes

[joshqsumner]

Describe your changes
Updated read.netcdf to read to GEO and DSM classes through a new helper _read_to_class which handles the logic for picking between DSM and GEO (this was simpler than finding a grayscale netcdf file).

Type of update
This is a feature update

Associated issues
Closes #110

Additional context
Follows #120

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv-geospatial/mkdocs.yml
• Changes to function input/output signatures added to changelog.md
• Code reviewed
• PR approved

[deepsource-io]

DeepSource Code Review

We reviewed changes in b6e6c2e...335ade8 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene   Coverage

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Apr 8, 2026 4:30p.m.	Review ↗
Test coverage		Apr 8, 2026 4:31p.m.	Review ↗

Code Coverage Summary

Language	Line Coverage (New Code)	Line Coverage (Overall)
Aggregate	100%	100%
Python	100%	100%

➟ Additional coverage metrics may have been reported. See full coverage report ↗