WMO OSCAR | Details for Instrument ALISS-3

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Instrument: ALISS-3

Instrument details

Acronym	ALISS-3
Full name	Advanced Linear Imaging Self-Scanning Sensor - 3
Purpose	High-resolution land and vegetation observation
Short description	5 VIS/NIR/SWIR channels [see details in the table below]
Background	Improved after LISS-3 flown on ResourSat 2 and 2A
Scanning Technique	Pushbroom, swath 925 km (multispectral or 280 km (panchromatic)
Resolution	PAN 10 m, multispectral 20 m, at s.s.sp.
Coverage / Cycle	Global in 4 days (multispectral) or 11 days (panchromatic), in daylight
Mass		Power	Data Rate

Providing Agency	ISRO
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	2025 to 2030
Last update:	2022-08-01

Detailed characteristics

Central wavelength	Spectral interval	SNR @ specified input spectral radiance
PAN	0.4 - 1.0 µm	200 @ …. W m^-2 sr^-1 µm^-1
0.555 µm	0.52 - 0.59 µm	200 @ 278 W m^-2 sr^-1 µm^-1
0.650 µm	0.62 - 0.68 µm	200 @ 284 W m^-2 sr^-1 µm^-1
0.815 µm	0.77 - 0.86 µm	200 @ 320 W m^-2 sr^-1 µm^-1
1.625 µm	1.55 - 1.75 µm	200 @ 76.4 W m^-2 sr^-1 µm^-1

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

Satellite for Earth Resources (ISRO)
- ResourceSat-3 (see instrument status) 2025 - 2030
- ResourceSat-3A (see instrument status) 2026 - 2030

Instrument classification

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

WIGOS Subcomponents

Subcomponent 1
High-resolution multi-spectral VIS/IR imagers
High-resolution multi-spectral VIS/IR imager

Mission objectives

Primary mission objectives

Biomass
Fraction of vegetated land
Land cover
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.

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Biomass*	4 - fair	Cloud sensitive.. Index only.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover	5 - marginal	Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels
Cloud optical depth	3 - high	Low-density cloud only.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels
Fire fractional cover	2 - very high	Cloud sensitive.. Daylight only.	VIS channels with high resolution for boundary detection
Fraction of vegetated land*	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Glacier cover	3 - high	Cloud sensitive.. Long time for mapping.. Daylight only.	VIS, NIR, SWIR and panchromatic channels for accurate boundary detection and screening ice from clouds
Land cover*	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Leaf Area Index (LAI)*	2 - very high	Cloud sensitive.. Daylight only.. Infrequent coverage.	VIS, NIR and SWIR channels
Normalised Difference Vegetation Index (NDVI)*	2 - very high	Cloud sensitive.. Infrequent coverage.	VIS and NIR channels
Photosynthetically Active Radiation (PAR)	5 - marginal	Cloud sensitive.. Infrequent coverage.	VIS channels, range undersampled
Short-wave cloud reflectance	4 - fair	Infrequent coverage.	VIS, NIR and SWIR channels. Unsuitable dynamic range (saturation)
Snow cover	1 - primary	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS, NIR, SWIR (snow/cloud discrimination) and panchromatic (higher resolution) channels
Soil moisture at surface	5 - marginal	Cloud sensitive.. Index only.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels. Soil moisture inferred from differential brightness
Soil type	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Upward short-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.	VIS, NIR and SWIR channels
Vegetation type*	2 - very high	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Aerosol volcanic ash	5 - marginal	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels
Aerosol volcanic ash Total Column	5 - marginal	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels
Sea-ice cover	4 - fair	Cloud sensitive.. Daylight only.	VIS, NIR (for contour enhancement) and SWIR (for discrimination from clouds) channels