TANSO-FTS (GOSAT) Data ProcessingEntry ID: GOSAT_TANSO-FTS_JAXA
Abstract: FTS is an instrument that utilizes optical interference. Within the instrument the incoming light is split into two beams which propagate in separate optical paths to create an optical path difference between the two. These beams are then recombined to cause interference. FTS measures the intensity of the interference by continuously changing the optical path difference. A spectrum, which is ... distribution of light intensity over a span of wavelength, is obtained via performing mathematical operation called the Fourier transform on that measured data.
FTS observes sunlight reflected from the earth's surface and light emitted from the atmosphere and the surface. The former is observed in the spectral bands 1 through 3 of FTS in the daytime, and the latter is captured in band 4 during both the day and the night. Prior to reaching the detectors of the instrument, the light in the bands 1 through 3 is split into two orthogonally-polarized components (P and S components) and measured independently. The light in the band 4, however, is not split. The instrument thereby observes the incoming light in seven different channels. The reflection character of sunlight over land and that of over water differ significantly. Observation of reflected light over the surfaces of oceans and lakes is difficult since the water absorbs sunlight. The water, however, reflects sunlight specularly in certain directions. The instrument thus targets such points when observing over large water surfaces.
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Data Set Citation
Dataset Originator/Creator: NIES
Dataset Title: TANSO-FTS (GOSAT) Data Processing
Dataset Release Date: 2009-04-06
Start Date: 2009-04-06
ISO Topic Category
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2012-05-15
Last DIF Revision Date: 2012-09-06