Add sar:bandwidth #26

[m-mohr]

Closes #26

[Copilot]

Pull Request Overview

This PR adds a new sar:bandwidth field to the SAR STAC extension to describe the range bandwidth of SAR instruments. The change includes schema updates, documentation, and example data to support this new field.

• Adds sar:bandwidth as a required field in the JSON schema with validation constraints
• Updates documentation to describe the new field and clarifies the sar:center_frequency description
• Provides example values in Sentinel-1 sample files and updates the changelog

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
json-schema/schema.json	Adds sar:bandwidth as required field with number type and minimum validation, plus validation for sar:center_frequency
examples/sentinel-1-slc-iw.json	Adds example sar:bandwidth and sar:center_frequency values for Sentinel-1 SLC data
examples/sentinel-1-grd-ew.json	Adds example sar:bandwidth value for Sentinel-1 GRD data
README.md	Documents the new sar:bandwidth field and clarifies sar:center_frequency description
CHANGELOG.md	Records the addition of sar:bandwidth and validation changes