XVIIIth Congress: XVIIIth Congress

kraus, karl; waldhäusl, peter

Bibliographic data

Multivolume work

Persistent identifier:: 1667435949

Title:: XVIIIth Congress

Sub title:: Vienna, Austria 1996

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667435949

Language:: English

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1667437070

Title:: XVIIIth Congress

Scope:: 230 Seiten

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667437070

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(31,B1)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist anhand des Copyrightjahrs ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: THE OPTIMIZATION OF THE STEREO ANGLE OF CCD-LINE-SCANNERS Anko Börner

Document type:: Multivolume work

Structure type:: Chapter

THE OPTIMIZATION OF THE STEREO ANGLE OF CCD-LINE-SCANNERS Anko Börner Institute of Space Sensor Technology German Aerospace Research Establishment (DLR) Rudower Chaussee 5, D-12484 Berlin, Tel.: (030) 69545517, Fax: (030) 69545529 Commission I, Working Group 3 KEY WORDS: Simulation, Camera, DTM, Three_line, Optimization ABSTRACT CCD-line-scanners are a real alternative to usually used aerial cameras. The principle of this type of cameras is the appli- cation of some CCD-lines with different viewing directions (stereo angle). For the determination of the optimal value of this camera parameter there is no reliable investigation or simple mathematical approach up to now. The paper presents the results of the optimization of the stereo angle of CCD-line-scanners using a simulation tool. The optimization was done the following way: With the help of a digital terrain model (DTM) a couple of images was gen- erated. A match algorithm was used to find conjugated points in these pictures. This information and the knowledge about the position of the simulated flight allows a reconstruction of the DTM. The comparison of both the original and the recon- structed DTM gives error criterions. With changing of certain parameters of the simulated camera the most suitable con- figuration for a special scientific task can be found. The result of the investigations was that a stereo angle between 15 and 20 degrees gives the best accuracy in generating of DTM’s for all simulated cases. KURZFASSUNG CCD-Zeilen-Scanner stellen eine reale Alternative zu den gewöhnlich genutzten Luftbildkameras dar. Das Grundprinzip bei diesen Kameras besteht in der Nutzung von mehreren CCD-Zeilen mit unterschiedlichen Blickrichtungen (Stereowin- kel). Zur Bestimmung eines optimalen Wertes dieses Kameraparamters gibt es derzeit noch keine zuverlässigen Unter- suchungen oder einfachen mathematischen Ansätze. Dieser Beitrag stellt die unter Nutzung eines Simulationspaketes erzielten Ergebnisse der Optimierung des Stereowinkels von CCD-Zeilen-Scannern vor. Die Optimierung wurde anhand folgenden Zyklus durchgeführt: Mit Hilfe eines vorliegenden digitalen Geländemodells (DTM) wurden zwei Bilder eines Geländeabschnittes erzeugt. Ein Match-Algorithmus wurde benutzt, um äquivalente Punkte in diesem Bildpaar zu finden. Mit diesen Informationen und den Lagedaten des simulierten Fluges kann wiederum ein DTM erstellt werden. Über den Vergleich des Ausgangsmodells mit dem rekonstruierten sind Fehlerkriterien definier- bar. Durch die Veränderung bestimmter Kameraparameter lassen sich die für eine spezielle wissenschaftliche Aufgaben- stellung beste Sensorkonfiguration ermitteln. Das Resultat der Untersuchungen ist, daß ein Stereowinkel zwischen 15 und 20 Grad für alle simulierten Anwendungs- fälle bestmögliche Ergebnisse bei der DTM-Erstellung gewährleistet. 1. INTRODUCTION CCD-line-scanners are real alternative to usually used aer- ial cameras. To get any information about the elevation of a point in an observed terrain at least two projections of it shot with different viewing directions are necessary. One possibility for realizing it is to use a scanner with at least two CCD-lines (two lines just for ideal flight paths), which generate images continuously. There are a few cameras utilizing this principle. One example is WAOSS (Wide Angle Optoelectronic Scanner). This camera is a technical contribution of the German Aerospace Research Estab- lishment (DLR) to the MARS 94/96 mission (WAOSS, 1991a, 1991b). To get more stable results in stereo- processing WAOSS uses three CCD-lines. The first one looks forward, the second one nadir and the last one back- ward. So in just one overflight all information needed for a : 3D-processing are available (Fig. 1). Fig. 1 CCD-line-scanner 26 International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996 The ste tion of image (Fig. 2) As reli expens ter ma that the to get € Such e Space Reulke image radiatir of the optical electro The sir lates th the sur tions, @ electro Algorit! applica mize c conditi: The be depen: followit ble suc With tr nerate previou becaus be no | change

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