WMO OSCAR | Details for Instrument ETM+

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Instrument: ETM+

Instrument details

Acronym	ETM+
Full name	Enhanced Thematic Mapper +
Purpose	Land and vegetation observation
Short description	8 channels (6 narrow-band in VIS/NIR/SWIR, one PAN, one in TIR) [see detailed characteristics below]
Background	Evolution of ETM flown on Landsat-6
Scanning Technique	Wiskbroom; 6000 pixel/line (narrow-band), 12000 pixel/line (PAN), 3000 pixel/line (TIR); swath 185 km
Resolution	30 m (6 narrow-band channels), 15 m (PAN), 60 m (TIR)
Coverage / Cycle	Global coverage in 16 days, in daylight.
Mass	441 kg	Power	590 W	Data Rate	150 Mbps

Providing Agency	NASA
Instrument Maturity	Flown on operational programme
Utilization Period:	1999 to 2024
Last update:	2021-06-16

Detailed characteristics

Central	Spectral	SNR or NEΔT @ specified input
wavelength	interval	Low signal	High signal
Panchromatic	0.50 - 0.90 µm	14 @ 22.9 W m^-2 sr^-1 μm^-1	80 @ 156.3 W m^-2 sr^-1 μm^-1
0.48 µm	0.45 - 0.52 µm	36 @ 40 W m^-2 sr^-1 μm^-1	130 @ 190 W m^-2 sr^-1 μm^-1
0.56 µm	0.53 - 0.61 µm	37 @ 30 W m^-2 sr^-1 μm^-1	167 @ 193.7 W m^-2 sr^-1 μm^-1
0.66 µm	0.63 - 0.69 µm	24 @ 21.7 W m^-2 sr^-1 μm^-1	127 @ 149.6 W m^-2 sr^-1 μm^-1
0.83 µm	0.78 - 0.90 µm	33 @ 13.6 W m^-2 sr^-1 μm^-1	226 @ 149.6 W m^-2 sr^-1 μm^-1
1.65 µm	1.55 - 1.75 µm	34 @ 4.0 W m^-2 sr^-1 μm^-1	176 @ 31.5 W m^-2 sr^-1 μm^-1
2.20 µm	2.09 - 2.35 µm	27 @ 1.7 W m^-2 sr^-1 μm^-1	130 @ 11.1 W m^-2 sr^-1 μm^-1
11.45 µm	10.4 - 12.5 µm	0.2 K @ 300 K	0.2 K @ 320K

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

Landsat (USGS)
- Landsat-7 (see instrument status) Jul 1999 - Jul 2024

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
Fire fractional cover
Fraction of Absorbed PAR (FAPAR)
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.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Fire fractional cover*	1 - primary	Cloud sensitive.. Infrequent coverage.	VIS and TIR channels
Fraction of vegetated land*	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Land cover*	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Snow cover	1 - primary	Cloud sensitive.. Infrequent coverage.. Daylight only.	VIS, NIR, SWIR (snow/cloud discrimination) and panchromatic (higher resolution) channels
Soil type	1 - primary	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Cloud cover	2 - very high	Infrequent coverage.	Channels in VIS, NIR, SWIR and the TIR window around 11 micrometers
Cloud type	2 - very high	Infrequent coverage.	Channels in VIS, NIR, SWIR and the TIR window around 11 micrometers
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
Vegetation type*	2 - very high	Cloud sensitive.. Daylight only.	VIS, NIR and SWIR channels
Sea-ice cover	2 - very high	Cloud sensitive.	VIS, NIR (for contour enhancement), SWIR (for discrimination from clouds) and TIR channels
Cloud optical depth	3 - high	Low-density cloud only.. Infrequent coverage.. 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
Biomass*	4 - fair	Cloud sensitive.. Index only.. Infrequent coverage.. Daylight only.	VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Fraction of Absorbed PAR (FAPAR)*	4 - fair	Cloud sensitive.. Infrequent coverage.	VIS channels including Red at 700 nm
Photosynthetically Active Radiation (PAR)	4 - fair	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)
Soil moisture at surface	4 - fair	Cloud sensitive.. Index only.. Infrequent coverage.	VIS and TIR window channels. Soil moisture inferred from thermal inertia
Cloud top temperature	5 - marginal	Infrequent coverage.	TIR window channel(s) around 11 micrometers
Earth surface albedo	5 - marginal	Cloud sensitive.. Infrequent coverage.	VIS channels
Fire radiative power	5 - marginal	Cloud sensitive.. Infrequent coverage.	TIR window channel(s) around 11 micrometers
Fire temperature	5 - marginal	Cloud sensitive.. Infrequent coverage.	TIR window channel(s) around 11 micrometers
Sea surface temperature	5 - marginal	Cloud sensitive.. Infrequent coverage.	TIR window channel(s)
Upward short-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.	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

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