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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
WIGOS Subcomponents
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
Secondary mission objectives Integrated Water Vapour (IWV) Opportunity objectives Cloud top height Specific humidity Show all Show fewer
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
Variable Relevance for measuring this variable Operational limitations Explanation
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
Leaf Area Index (LAI) 2 - very high Cloud sensitive.. Daylight only.. Infrequent coverage. NIR and SWIR hyperspectral 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
Integrated Water Vapour (IWV) 5 - marginal Cloud sensitive.. Infrequent coverage.. Daylight only. NIR hyperspectral channels covering the 940 nm band
Instrument: LAC