BackForwardInstrument:  AMI 

Instrument details
Acronym AMI
Full name Advanced Meteorological Imager
Purpose Multi-purpose imagery and wind derivation by tracking clouds and water vapour features
Short description 16 VIS/NIR/SWIR/MWIR/TIR channels [see detailed characteristics below]
Background Replacing MI flown on COMS-1
Scanning Technique Mechanical, 3-axis stabilised satellite, E-W continuous, S-N stepping
Resolution 0.5 km or 1.0 km or 2.0 km
Coverage / Cycle Less than 10 min for full disk, correspondingly less for limited areas
Mass 338 kg Power 450 W Data Rate < 66.6 Mbps (compressed)

 

Providing Agency KMA
Instrument Maturity Backed by strong heritage
Utilization Period: ≥2018 to ≥2029
Last update: 2017-03-26
Detailed characteristics

Central wavelength

Bandwidth

SNR or NEΔT @ specific input

IFOV at s.s.p.

455 nm

75 nm

250 @ 100 % albedo

1.0 km

510 nm

62.5 nm

250 @ 100 % albedo

1.0 km

642 nm

125 nm

120 @ 100 % albedo

0.5 km

860 nm

87.5 nm

210 @ 100 % albedo

1.0 km

1,38 nm

30 nm

300 @ 100 % albedo

2.0 km

1,61 nm

75 nm

300 @ 100 % albedo

2.0 km

3.85 μm

0.50 μm

0.20 K @ 300 K

2.0 km

6.24 μm

1.04 μm

0.40 K @ 240 K

2.0 km

6.95 μm

0.50 μm

0.37 K @ 240 K

2.0 km

7.35 μm

0.69 μm

0.69 K @ 240 K

2.0 km

8.60 μm

0.50 μm

0.10 K @ 300 K

2.0 km

9.63 μm

0.48 μm

0.35 K @ 240 K

2.0 km

10.43 μm

0.88 μm

0.20 K @ 300 K

2.0 km

11.20 μm

1.00 μm

0.10 K @ 300 K

2.0 km

12.30 μm

1.23 μm

0.20 K @ 300 K

2.0 km

13.30 μm

0.75 μm

0.30 K @ 300 K

2.0 km

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

Instrument classification
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • Moderate resolution optical imager
Mission objectives
Primary mission objectives
  • Cloud cover
  • Cloud optical depth
  • Cloud top height
  • Cloud top temperature
  • Cloud type
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Tentative 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
VariableRelevance for measuring this variableOperational limitationsExplanation
Biomass4 - fairCloud sensitive.. Index only.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover1 - primaryNo specific limitation.VIS, NIR, SWIR, MWIR and TIR channels
Cloud drop effective radius4 - fairAt cloud top.. Daylight only.VIS, NIR, SWIR and MWIR channels (for differentiation)
Cloud ice effective radius4 - fairAt cloud top.. Daylight only.VIS, NIR, SWIR and MWIR channels (for differentiation)
Downward short-wave irradiance at Earth surface4 - fairCloud sensitive.. Highly indirect.VIS, NIR and SWIR channels
Downward long-wave irradiance at Earth surface5 - marginalCloud sensitive.. Highly indirect.MWIR and TIR channels including water vapour and CO2 bands
Earth surface albedo3 - highCloud sensitive.VIS channel with changing solar incidence angles as daylight progresses
Earth surface short-wave bidirectional reflectance4 - fairCloud sensitive.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Fire fractional cover2 - very highCloud sensitive.. Coarse spatial resolution.VIS, MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Fire radiative power2 - very highCloud sensitive.. Coarse spatial resolution.MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Fire temperature2 - very highCloud sensitive.. Coarse spatial resolution.MWIR and TIR channels. Frequent sampling (GEO) enables early detection
Fraction of Absorbed PAR (FAPAR)3 - highCloud sensitive.VIS channels including Red at 700 nm
Land surface temperature4 - fairCloud sensitive.MWIR and TIR window channels (high sensitivity to high temperature, cloud impact reduction, water vapour correction)
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.VIS and NIR channels
O3 (Total column)4 - fairCloud sensitive.TIR channel(s). Ozone lines in band around 9.7 micrometers. Frequent sampling (GEO) enables monitoring diurnal variations
Photosynthetically Active Radiation (PAR)4 - fairCloud sensitive.VIS channels, range undersampled
Precipitation intensity at surface (liquid or solid)4 - fairConvective precipitation dominant.. Calibration by MW needed.TIR channels in the 11 micrometers window, and SWIR and the MWIR 3.7 window channel for cloud microphysics. Frequent sampling (GEO) consistent with precipitation temporal variability
Short-wave cloud reflectance4 - fairNo specific limitation.VIS and NIR channels
Snow cover2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels enabling screening snow from clouds. Frequent sampling improves probability of cloud-free views
Soil moisture at surface3 - highCloud sensitive.. Index only.VIS, NIR, SWIR, MWIR and TIR channels. Soil moisture inferred from differential brightness and thermal inertia, that are accurately measured by frequent sampling (GEO)
Upward short-wave irradiance at TOA3 - highSpectral interpolation needed.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Upward long-wave irradiance at TOA4 - fairSpectral interpolation needed.MWIR and TIR channels in windows around 3.7 and 11 micrometers, and in water vapour and CO2 bands around 6.3 and 15 micrometers
Upward long-wave irradiance at Earth surface5 - marginalCloud sensitive.. Highly indirect.MWIR and TIR channels in windows around 3.7 and 11 micrometers, and in the water vapour band around 6.3 micrometers
Wind (horizontal)2 - very highCloud or water vapour tracers needed.VIS channel(s) and TIR channels around 6.3 and 11 micrometers, and 13.3 micrometers for more accurate height assignment. Frequent sampling (GEO) enables inference from cloud or water vapour pathces motion
Accumulated precipitation (over 24 h)3 - highConvective precipitation dominant.. Calibration by MW needed.TIR channel(s) in the 10-13 micrometers range. Frequent sampling (GEO) is essential for accumulated precipitation
Aerosol column burden4 - fairCloud sensitive.. Daylight only.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Aerosol Optical Depth4 - fairCloud sensitive.. Daylight only.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Aerosol volcanic ash4 - fairCloud sensitive.. Daylight only.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Aerosol volcanic ash (Total column)1 - primaryCloud sensitive.TIR channel(s). Frequent sampling (GEO) enables early detection of ash plumes
Integrated Water Vapour (IWV)2 - very highCloud sensitive.TIR channels around 6.3 micrometers and in the 11 micrometers split window
Specific humidity3 - highCloud sensitive.. Coarse vertical resolution.. Middle troposphere only.TIR channels in the water vapour band around 6.3 micrometers
Sea surface temperature2 - very highCloud sensitive.MWIR and TIR window channels around 3.7 and 11 micrometers (cloud impact reduction, water vapour correction)
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Cloud top temperature2 - very highNo specific limitation.TIR channels in window and water vapour band (for emissivity)
Cloud top height2 - very highNo specific limitation.TIR channels in window and water vapour band (for emissivity) for temperature; and in CO2 band for atmospheric column above cloud top
Cloud type1 - primaryNo specific limitation.VIS, NIR, SWIR, MWIR and TIR channels
Cloud optical depth3 - highLow-density cloud only.. Daylight only.VIS, NIR and SWIR channels