WMO OSCAR | Details for Instrument HSI-2

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Instrument: HSI-2

Instrument details

Acronym	HSI-2
Full name	Hyper-Spectral Imager
Purpose	Land observation and detailed vegetation classification
Short description	VNIR spectrometer. 128 channels in the spectral range 450-950 nm, channel bandwidths = 4 nm
Background	Development after HSI flown on HJ-1A
Scanning Technique	Pushbroom. Swath 50 km
Resolution	48 m at s.s.p.
Coverage / Cycle	Global coverage in 62 days (two repeat cycles)
Mass		Power	Data Rate

Providing Agency	CAST
Instrument Maturity	Flown on operational programme
Utilization Period:	2020 to 2025
Last update:	2021-06-22

Detailed characteristics

Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Huan Jing (CRESDA)
- HJ-2A (see instrument status) Dec 2020 - 2025
- HJ-2B (see instrument status) Dec 2020 - 2025

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
High resolution optical imager

WIGOS Subcomponents

Subcomponent 1
Narrow-band or hyperspectral imagers
Hyperspectral imager (for vegetation)

Mission objectives

Primary mission objectives

Biomass
Fraction of Absorbed PAR (FAPAR)
Fraction of vegetated land
Leaf Area Index (LAI)
Normalised Difference Vegetation Index (NDVI)
Vegetation type

Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Normalised Difference Vegetation Index (NDVI)*	1 - primary	Cloud sensitive.. Infrequent coverage.	VIS and NIR hyperspectral channels
Fire fractional cover	2 - very high	Cloud sensitive.. Daylight only.	VIS channels with high resolution for boundary detection
Fraction of vegetated land*	2 - very high	Cloud sensitive.. Daylight only.	VIS and NIR hyperspectral channels
Land cover	2 - very high	Cloud sensitive.. Daylight only.	VIS and NIR hyperspectral channels
Soil type	2 - very high	Cloud sensitive.. Daylight only.	VIS and NIR hyperspectral channels
Vegetation type*	2 - very high	Cloud sensitive.. Daylight only.	VIS and NIR hyperspectral channels
Fraction of Absorbed PAR (FAPAR)*	3 - high	High troposphere only.. Cloud sensitive.. Infrequent coverage.	VIS channels including Red at 700 nm
Leaf Area Index (LAI)*	3 - high	Cloud sensitive.. Daylight only.. Infrequent coverage.	VIS and NIR hyperspectral channels. LAI inferred from NDVI and other vegetation indexes
Photosynthetically Active Radiation (PAR)	3 - high	Cloud sensitive.. Infrequent coverage.	VIS channels, range accurately sampled
Aerosol column burden	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level aerosol
Aerosol effective radius	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level aerosol
Aerosol mass mixing ratio	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level aerosol
Aerosol Optical Depth	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level aerosol
Aerosol type	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level aerosol
Biomass*	4 - fair	Cloud sensitive.. Index only.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels. Biomass inferred from NDVI and other vegetation indexes
Cloud cover	4 - fair	Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels
Cloud optical depth	4 - fair	Low-density cloud only.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral, channels
Cloud top height	4 - fair	Infrequent coverage.. Daylight only.	NIR hyperspectral channels to estimate the total-column O2 above the cloud top as measured around 760 nm
Downward short-wave irradiance at Earth surface	4 - fair	Cloud sensitive.. Highly indirect.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels
Earth surface albedo	4 - fair	Cloud sensitive.. Infrequent coverage.	VIS hyperspectral channels
Glacier cover	4 - fair	Cloud sensitive.. Long time for mapping.. Daylight only.	VIS and NIR channels
Oil spill cover	4 - fair	Cloud sensitive.. Daylight only.. Infrequent coverage.	VIS hyperspectral channels
Snow cover	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR channels
Specific humidity	4 - fair	Cloud sensitive.. Very coarse vertical resolution.. Infrequent coverage.. Daylight only.	NIR hyperspectral channels including the ro-sigma-tau band of water vapour around 940 nm
Aerosol volcanic ash	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level ash
Aerosol volcanic ash Total Column	4 - fair	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels including the 760 nm band for high-level ash
Cloud type	5 - marginal	Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels
Short-wave cloud reflectance	5 - marginal	Infrequent coverage.	VIS and NIR channels. Unsuitable dynamic range (saturation)
Soil moisture at surface	5 - marginal	Cloud sensitive.. Index only.. Infrequent coverage.. Daylight only.	VIS and NIR hyperspectral channels. Soil moisture inferred from differential brightness
Upward short-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.	VIS and NIR hyperspectral channels
Integrated Water Vapour (IWV)	5 - marginal	Cloud sensitive.. Infrequent coverage.. Daylight only.	NIR hyperspectral channels covering the 940 nm band
Sea-ice cover	5 - marginal	Cloud sensitive.. Daylight only.	VIS and NIR (for contour enhancement) channels

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