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POLarization and Directionality of the Earth's Reflectances
POLDER-2 Instrument
INSTRUMENT
Mass 32 kg
Volume 0.8 x 0.5 x 0.25 m³
Power 50 W
Swath 2400 km
Resolution 6 x 7 km²
15 filters & polarizers in the visible and the near infrared
Lifetime 3 years

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Technical Features

The POLDER instrument is a camera composed of a two-dimensional CCD detector array, wide field of view telecentric optics and a rotating wheel carrying spectral and polarized filters.
 
Mass 32 kg
Volume 0.8 x 0.5 x 0.25 m³
Power Consumption 50 W (image mode)
Encoding 12 bits
Data rate 883 kbps
Field of View ± 43° along track
± 51° cross track
Swath 2400 km
Pixel (at nadir) 6 km x 7 km
Mission Lifetime 3 years

POLDER has 15 spectral bands which range from 443 nm to 910 nm. Two of these spectral bands are centered on molecular absorption bands: 763 (O2) and 910 (H2O).

POLDER band 443P 443NP 490NP 565NP 670P 763NP 765NP 910NP 865P
Central Wavelength 444.5 444.9 492.2 564.5 670.2 763.3 763.1 907.7 860.8
Approximate Band Width 20 20 20 20 20 10 40 20 40
Polarization Yes No No No Yes No No No Yes
Saturation level 1.1 0.97 0.75 0.48 1.1 1.1 1.1 1.1 1.1

This table provides the spectral band characterisitcs for the POLDER instrument aboard the ADEOS-1 satellite. The 9 bands are defined by their central wavelength, spectral width and polarization capabilities. The saturation levels are given in unit of normalised radiance, I.e. the maximum spectral radiance divided by the solar spectral irradiance at nadir and multiplied by . The dynamic reflectance range is subsequently obtained by dividing the range given in this table by cos(), where is the solar zenith angle.

POLDER instrumental response
Spectral Response

In order to correct from absorption effects, spectral sensitivities of all POLDER bands are given in the spectrum file for POLDER 1 and POLDER 2.


Latest Update 24/04/2003

 
INSTRUMENT
Technical features  
Performances requirements  
Concept  
Multispectral  
Directionality  
Polarization