Proceedings, XXth congress: Proceedings, XXth congress

Altan, M. Orhan

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Multivolume work

Persistent identifier:: 1663674213

Title:: Proceedings, XXth congress

Sub title:: Istanbul, 12 - 23 July 2004

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1663674213

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.; Auch bezeichnet als XXth International Congress for Photogrammetry and Remote Sensing

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Document type:: Multivolume work

Volume

Persistent identifier:: 166368779X

Title:: Proceedings, XXth congress

Scope:: IV, 226 Seiten

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 166368779X

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(35,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

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

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

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:: URBAN ORTHOIMAGE ANALYSIS GENERATED FROM IKONOS DATA S. Siachalou

Document type:: Multivolume work

Structure type:: Chapter

URBAN ORTHOIMAGE ANALYSIS GENERATED FROM IKONOS DATA S. Siachalou Dept. Cadastre, Photogrammetry and Cartography, Aristotle University of Thessaloniki, GREECE, sofiasiahalou@hotmail.com Youth Forum KEY WORDS: Remote Sensing, Ikonos, orthoimage, fusion, urban, 3D visualization. ABSTRACT: Due to the increasing demand and use of digital spatial information, the interest is being drawn to the generation of digital orthophotos, which is the most accurate and reliable source of spatial information. The subject of this project is the generation of orthoimages as well as the further processing of these orthoimages for the full exploitation of their spectral and spatial information. The imagery data used are a panchromatic image of one-meter spatial resolution and a multispectral image of four-meter spatial resolution, both acquired from Ikonos-2 satellite over the extended region of the city of Thessaloniki. The orthorectification of the images involved the establishment of the interior and exterior orientation through the Rational Function coefficients, a number of ground control points, and a Digital Terrain Model (DTM). Following the orthorectification, the panchromatic orthoimage was fused with the multispectral orthoimage to produce a pan-sharpened image with the method Principal Components Transformation. At this point the spectral quality and the spatial accuracy of the pan-sharpened image were assessed by certain criteria, as it is very significant for the sharpened image to maintain the spectral and the spatial information of the original data. In order to produce an image containing thematic information a supervised classification pan-sharpened was realised. Finally the products of the analysis of the pan-sharpened orthoimage were used for the visualization of the study area. 1. INTRODUCTION obtained by GPS measurements and orthophotos of scale 1: 5000. Since the launch of Ikonos satellite a new era for Remote Sensing products has began. The generation of high-resolution The software used for the processing of the data is Erdas orthoimages is an important task as it has a use in various IMAGINE 8.5. applications such as mapping, agriculture and urban planning. Thus it is of great importance to produce digital spatial products and improve their geopositional accuracy. In this project the improvement of the accuracy of the orthoimages was accomplished by the use of GCPs obtained by GPS measurements and orthophotos, a DTM and Ikonos images. Since the camera model and precise satellite ephemeris data are not available for Ikonos imagery, the use of the Rational Function was decided as it can offer a very accurate approximation to the rigorous physical sensor model (Kratky, 1989). Furthermore the applications mentioned require further processing of the orthoimages in order to extract all the useful information. Having this in mind, the panchromatic orthoimage was fused with the multispectral orthoimage so as to achieve high spatial resolution while maintaining the provided spectral Figure 1. a) Map of Greece with the area of interest b) the resolution,. It should be noted that the synthetic orthoimage is panchromatic lkonos image ideal for the extraction of thematic information, which can be made though classification. 3. ORTHORECTIFICATION 2. DATA 3.1 Geometric Sensor Models Sensor models are vital in orthorectification because they describe the relationship between the coordinates of the image space and the object space and allow their transformation. There are two categories of sensor models, the physical and the generalised models. The physical sensor model establishes the physical imaging process. This can be a disadvantage because the position and orientation of a satellite sensor changes during the image acquisition, the geometric model is time-dependent The satellite data used is a panchromatic Ikonos image of 1-m resolution and a multispectral Ikonos image of 4-m resolution both over the extended region of the city of Thessaloniki. For the orthorectification of these images two DTMs were available, the first one has a grid size of 25-m and covers all the study area while the second one has a grid size of 20- m and covers the hilly region of Seih Sou. The GCPs used were 186

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