MOS-B data corrected by standard calibration procedures are affected by 'striping' in most channels. Striping arises because of the imperfect calibration of the detector characteristics. In this paper, we present a method for removing striping, in which the equalization curves are estimated by exploiting a data base of carefully selected homogeneous targets. We present the results obtained on sea target images. Such a case study is of great interest because it is related to ocean color applications, for which the MOS-B sensor was especially designed. We also estimate the reduction of striping noise in the equalized image by means of two appropriate indexes of quality

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In the Institute for Space Sensor Technology a new generation of remote sensing imaging spectrometers was developed, measuring the reflected from the ocean atmosphere system radiance in the visible to near-infrared spectral range. This Modular Optical Scanner (MOS) was successfully launched on 21 March 1996 with an Indian satellite (IRS-P3) to a polar sunsynchronous orbit, and on 23 April 1996 with the Russian Priroda Module on the MIR station. For the purpose of interpretation of these measurements over oceans and coastal zones has been developed a special algorithm based on Principal Component Analysis, using a special inversion technique fx a given ocean-atmosphere physical model. An important question in the description of such models are the inherent optical properties of the water. In the paper will be given a description of the derivation of the interpretation algorithm f different water constituents, with an inherent atmospheric correction. It will be shown how specific optical properties are influencing the interpretation results. This work was peilormed in cooperation with the Baltic Sea Research Institute Warnemuende. /97/$1O.OO Downloaded From: http://proceedings.spiedigitallibrary.org/ on 05/28/2015 Terms of Use: http://spiedl.org/terms 7. Prieur L, Sathyendranath S.: Limnol. and Oceanogr. 26(1981)4, pp. 671ff. 8. Neumann A. et: al.: A complex approach to quantitative Interpretation of spectral high resolution imagery,

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The Modular Optoelectronic Scanner MOS of the German Aerospace Center (DLR) has now been working about three years on board the Indian Remote Sensing Satellite IRS-P3 very successfully. It consists of three instruments: the spectrometer MOS-A (for atmospheric purposes with 4 spectral bands in the 02A absorption band from 757nm to 767 nm and a spectral FWHM of i -1.4 nm), the spectrometer MOS-B (for ocean, land and atmospheric purposes with 13 spectral bands between 400 nm and 1010 nm and a spectral FWHM of AX 10 nm) and the camera MOS-C (1 spectral band at 1.6 jim with a spectral FWHM of & = 100 nm). To meet the sophisticated radiometric and spectral requirements especially for ocean purposes, a 16 bit dynamic range and a qualified in-flight calibration concept including sun calibration and internal lamp calibration have been established. All three instruments have shown a remarkably high data stability and quality during the three years mission time. The highest changes of radiometric sensitivity of +7% were found in the SWIR-channels of MOS-B and the lowest changes of -1% in the MOS-A channels. Spectral shifts of center wavelengths could not be found. Small differences between the results of the two calibration methods are due to the fact that they do not cover the same optical components exactly. But this enables us to allocate the sensitivity changes to those components of the instruments which cause them. The measured in-orbit calibration values were used to update the calibration coefficients.

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The Modular Optoelectronic Scanner MOS was developed at the Institute of Space Sensor Technology/Berlin of the German Aerospace Center (DLR) and specially designed for observations of medium scale effects of the system surface-atmosphere. MOS consists of the two VIS/NIR imaging spectrometers MOS-A and MOS-B and the SWIR camera MOS-C. It was launched on March 21, 1996 on board the Indian Remote Sensing Satellite IRS-P3 together with the Indian Wide Field Scanner WIFS and an X-ray instrument. Two different in-orbit calibration devices are integrated into the MOS equipment:(1) the internal calibration system based on two minilamps and (2) the sun calibration based on spectralon diffusers for absolute radiometric recalibration and long-term stability check of the sensitivity. Thus it is possible to determine the actual relative calibration data with an accuracy of about 0.5 %. The interpretation of the calibration data of the MOS-LRS mission in orbit for two years shows that all detector elements really are working normally. The behaviour of the sensitivity of all elements of a CCD-line is nearly identical. Altogether, the sensitivity of the MOS-A channels remains constant in an interval of 0.7 %, increases by different amounts for the MOS-B channels up to 6 % and decreases for MOS-C about 1 %. The results of the in-orbit calibrations are the basis for a consistent interpretation of the remote sensing measurements of the environment.