October 31, 2014


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.
Mass32 kg
Volume0.8 x 0.5 x 0.25 m³
Power Consumption50 W (image mode)
Encoding12 bits
Data rate883 kbps
Field of View± 43° along track
± 51° cross track
Swath2400 km
Pixel (at nadir)6 km x 7 km
Mission Lifetime3 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 band443P443NP490NP565NP670P763NP765NP910NP865P
Central Wavelength444.5444.9492.2564.5670.2763.3763.1907.7860.8
Approximate Band Width202020202010402040
Saturation level1.10.970.750.481.

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.