XXII ISPRS Congress 2012: Technical Commission VIII

Shortis, M.; Shimoda, H.; Cho, K.

Bibliographic data

Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663822514

Title:: Technical Commission VIII

Scope:: 590 Seiten

Year of publication:: 2014

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663822514

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

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

Editor:: Shortis, M.; Shimoda, H.; Cho, K.

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; 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:: [VIII/4: Water]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: BATHYMETRIC EXTRACTION USING WORLDVIEW-2 HIGH RESOLUTION IMAGES M. Deidda, G. Sanna

Document type:: Multivolume work

Structure type:: Chapter

ends and rer Review rends and la. Current dia's water -119. pacity land els. Water gess, S. J., id surface, models. J. 996. One- grid spatial infiltration 03-21,422. ns in All- . Climatic Asia. John f rainfall in ophys., 25, ily gridded eorological ikke, N. A. erm trends ol., 12, pp. Long-lead om global range and ury, SK, id sea level Delhi, 2—5 e changes International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia BATHYMETRIC EXTRACTION USING WORLDVIEW-2 HIGH RESOLUTION IMAGES M. Deidda “, G. Sanna “ ? DICAAR, Dept. of Civil and Environmental Engineering and Architecture. — University of Cagliari, 09123 Cagliari, Italy - (mdeidda, topoca)@unica.it Commission VIII, WG VIIL/4 KEY WORDS: Bathymetry, Underwater, Satellite, WorldView2, High resolution, Imagery, Stereoscopic, Accuracy ABSTRACT: The fundamental principle underlying the methods used to extract bathymetric information from remote-sensed imagery is that different wavelengths of the solar light penetrate the water body to different depths. In order to extract bathymetric values from multispectral satellite imagery we implemented the Jupp method (Jupp, 1988), in IDL language and integrated it in the ENVI menu structure. In this experiment we apply this method to two images of the Poetto beach in Cagliari (Sardinia, Italy) acquired from the new-generation WorldView-2 sensor. Launched in October 2009, the WorldView-2 sensor provides, among others, one (named Coastal) that was designed specifically for this kind of analysis; we chose to use the Coastal band in place of the Blue one when applying the model. The images (a stereoscopic pair) were acquired on June 17, 2011. The 5419 scene was pre-processed in order to separate the sea bottom classes. This class was then georeferenced to overlap on the 5318 scene. A traditional bathymetric survey was performed, up to 1,50 m, planned and carried out in order to calibrate the model. For each scene, 10 calibration areas were selected, and for each of them a digital model of the sea bottom was generated. Precision and accuracy of the method were evaluated by analyzing the results extracted from the stereo-pairs and by examining the correlation between the surveyed depth values and the calculated ones, between the different models calculated from the same scene using different calibration areas, and between the models obtained from the two images. 1. INTRODUCTION Since 1984, launch date of the Landsat 5 satellite, whose imagery was used for the first bathymetric mapping from satellite images, the technology has advanced in strides. In the last decade, the construction of high resolution sensors such as Ikonos and Quickbird allowed for ever more accurate analysis. Still, to date it's not yet possible to evaluate the precision of the model, but only to estimate the achieved accuracy by comparing the digital models extracted from the imagery with actual bathymetric surveys. The technique for extracting bathymetric information from satellite imagery is becoming widespread, to the point that the WorldView 2 satellite sensor was designed with a dedicated band named “Coastal”. One method for obtaining the precision of the procedure is comparing the results from independed images acquired at the same time. The fact that WorldView2 can produce stereo pairs where the component scenes are acquired in a short time interval thus makes possible to evaluate the precision of the results. For the purposes of this research it was chosen as a test area the Poetto littoral. Located on the southern coast of the island of Figure 1. Distribution of the Areas of calibration in the 5318 Sardinia (Italy), the Poetto is the beach of the city of Cagliari, Scene Whose urban area surrounds it. Its geographic position has determined its history: it was always subject to erosion phenomena, mostly of anthropic origin, and for this reason in 2002 it underwent a beach nourishment intervention with sand collected from the sea. The evaluation of accuracy was performed by comparing the depth values extracted from each scene, between the different scenes and with the bathymetric survey. In each scene, 10 different deep water areas of 50x50 pixels were selected and used to calibrate the model. The distribution of the calibration areas in the two scenes is shown in Figure 1 and Figure 2.

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