generated: '2026-07-19'
method: searched
source: https://satdocs.hydrosat.com/product-details/changelog
scheme: dated
current_version: '0.1'
scope: >-
  Hydrosat publishes a dated satellite-data-product changelog (imagery
  processing/quality updates), not a semver API changelog. Recent window below.
entries:
  - date: '2026-05-21'
    title: Footprint Geometry Correction
    breaking: false
    highlights:
      - Fix to align STAC item footprint geometries with actual imaged area.
  - date: '2026-03-31'
    title: Coregistration Improvements
    breaking: false
    highlights:
      - Refined mutual-information coregistration for LWIR/VNIR feature matching.
  - date: '2026-02-24'
    title: Geometric Processing Improvements
    breaking: false
    highlights:
      - Enhanced optical distortion correction reducing along-track offsets.
      - DEM-based band-to-band registration over complex terrain.
  - date: '2026-02-05'
    title: Level-1 Unit Changes
    breaking: true
    highlights:
      - L1A assets now carry TOA radiance (W/m2/sr/um) natively.
      - L1B assets carry TOA reflectance (VNIR) and brightness temperature (Kelvin, LWIR).
      - Gain/offset coefficients now applied in processing; conversion coefficients in metadata.