Oeuvres complètes: Contenant les oeuvres de l'auteur qui n'ont pas été publiées auparavant

Abel, Niels Henrik; Holmboe, Bernt Michael

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Multivolume work

Persistent identifier:: 870656341

Author:: Abel, Niels Henrik; Holmboe, Bernt Michael

Title:: Oeuvres complètes

Year of publication:: 1839

Place of publication:: Christiania

Publisher of the original:: chez Chr. Gröndahl, Imprimeur-Libraire

Identifier (digital):: 870656341

Language:: French

Additional Notes:: Bände 1-2 erschienen 1839

Document type:: Multivolume work

Volume

Persistent identifier:: 870656783

Author:: Abel, Niels Henrik; Holmboe, Bernt Michael

Title:: Contenant les oeuvres de l'auteur qui n'ont pas été publiées auparavant

Scope:: 294 Seiten

Year of publication:: 1839

Place of publication:: Christiania

Publisher of the original:: chez Chr. Gröndahl, Imprimeur-Libraire

Identifier (digital):: 870656783

Signature of the source:: Mr.I 56(2)

Language:: French

Usage licence:: Public Domain Mark 1.0

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Mathematics

Chapter

Title:: XXV. Extraits de quelques lettres de l'auteur à l'éditeur.

Document type:: Multivolume work

Structure type:: Chapter

Improving the Quality of Satellite Image Maps by Various Processing Techniques RUEDIGER TAUCH AND MARTIN KAEHLER Technical University of Berlin Photogrammetry and Cartography Straße des 17.Juni 135 Berlin, Germany Commission IV Abstract During the‘ process of satellite image map production the scanner data undergo quite a number of processing algorithms in order to achieve geometrical rectification and radiometrical enhancement. However, some of these algorithms, e.g. resampling techniques, are connected with undesired secondary effects degrading the quality of the data. Therefore processing algorithms must be carefully applied and special enhancement techniques need to be developed. This is of special importance if data from new sensor systems are concerned. Only sophisticated processing algorithms make full use of the mapping potential of these data possible. This paper describes various processing methods and their application to satellite image data such as MOMS, THEMATIC MAPPER and SPOT-HRV. This includes radiometrical processing, geometrical resampling with minimized degradation of lines and edges by means of pixel doubling, enhancement of particular features with statistical methods or filter techniques. The combination of SPOT panchromatic and THEMATIC MAPPER data is carried out in order to combine multispectral information and the very high resolution data to a high quality image map. The results of the applied methods are visualized and discussed critically. 1. Introduction in satellite image map production In the course of a modern satellite image map production the data processing is done entirely by digital techniques. For this purpose a comprehensive software system has to be used, which covers all the aspects involved. Such a software system can be split up into several subsystems, each one covering a group of processing operations in a special software package. The software developed at the Technical University of Berlin follows the general outline which is sketched in figure 1. The main aspects of the approach are briefly described below. Preprocessing: Preprocessing has a radiometrical and a geometrical aspect. The original satellite scanner data undergo at first some radiometrical preprocessing, e.g. elimination of striping effects, because these techniques in some cases require the original image geometry. The purpose of geometrical preprocessing is to eliminate the distortions caused by several system parameters, as far as these distortions are not yet corrected by the ground receiving stations delivering the data. Geometrical mosaicking and rectification: For the production of satellite image maps usually several scenes have to be mosaicked and rectified to fit the coordinate system of the map. The parameters for this process can be determined simultaneously in a least squares adjustment for all the scenes involved. For this purpose the geo- metric reference system of the map has to be defined by a sufficient number of ground tie | and rect an « imag avai ima; radi and radi met achi info! corr to tr imag and proc Howi lines Thes data. Seti« form

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