EO·Atlas
Coastal Zone Imager
Compiled from public sources on 2026-06-15. Not independently verified by China Academy of Space Technology.
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Coastal optical imager flown on HY-1D.
The Coastal Zone Imager (CZI) is a spaceborne passive optical instrument designed for ocean-colour monitoring and coastal observation. It has flown on the HY-1 ocean-colour satellite series.[1]
Resolution and swath differ by satellite generation. On HY-1A and HY-1B, CZI operated at 250 m ground sampling distance with a 500 km swath.[1] On HY-1C and HY-1D the design was substantially upgraded: ground sampling distance was improved to 50 m,[2] and swath was extended to approximately 950 km by mosaicking imagery from two cameras, each covering a 32-degree field of view with a 1-degree overlap.[3]
The spectral configuration supports ocean-colour retrieval, vegetation index mapping, and optical time-series change detection.[1] The focal-plane array type is not disclosed in publicly available documentation.
Compositional position
None on record.
- Optical time-series change detection
CZI is a coastal optical imaging payload on operational HY-1D; detailed use-case evidence should be strengthened in full sensor research.
- Ocean colour / water-leaving radiancepending review
CZI 4-band (460,560,650,825 nm) used for coastal water quality and HAB detection; 4 bands below ocean-colour-method minimum of 5 bands hence capable-pending-review
- Vegetation index mapping
CZI 650 nm and 825 nm bands enable NDVI-equivalent vegetation index mapping over coastal zones and tidal flats
- [1]WMO OSCAR instrument record: CZIcommunity2026-06-15
- [2]HY-1C/1D mission overview, eoPortalcommunity2026-06-15
- [3]HY-1A mission overview, eoPortalcommunity2026-06-15
- [4]Out-of-Band Response for CZI Onboard HY-1C, PMC/Remote Sensingpeer reviewed2026-06-15
- [5]WMO OSCAR satellite record: HY-1Ccommunity2026-06-15