BackForwardInstrument:  LAC 

Instrument details
Acronym LAC
Full name LEISA Atmospheric Corrector (LEISA = Linear Etalon Imaging Spectrometer Array
Purpose Advanced technology for land and vegetation observation - To correct ALI data for atmospheric effects
Short description NIR filter-wedge spectrometer with 256 channels covering the range 0.93-1.58 µm with spectral resolution ranging from 2 to 6 nm.  In addition, a 1.38 µm channel enables cirrus detection
Background Flown on NMP EO-1 (instrument premature failure in 2001)
Scanning Technique Pushbroom; 768 pixel/line; swath 185 km
Resolution 250 m IFOV
Coverage / Cycle Global coverage in 16 days, in daylight.
Mass 10.5 kg Power 35 W Data Rate 95 Mbps


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2001 to 2001-02-21
Last update: 2014-01-17
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

Instrument classification
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • High resolution optical imager
Mission objectives
Primary mission objectives
  • Leaf Area Index (LAI)
Secondary mission objectives
  • Integrated Water Vapour (IWV)
Opportunity objectives
  • Cloud top height
  • Specific humidity
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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
Cloud top height4 - fairInfrequent coverage.. Daylight only.NIR hyperspectral channels to estimate the total-column O2 above the cloud top as measured around 760 nm
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.. Infrequent coverage.NIR and SWIR hyperspectral channels
Specific humidity4 - fairCloud sensitive.. Very coarse vertical resolution.. Infrequent coverage.. Daylight only.NIR hyperspectral channels including the ro-sigma-tau band of water vapour around 940 nm
Integrated Water Vapour (IWV)5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.NIR hyperspectral channels covering the 940 nm band