XXII ISPRS Congress 2012: Technical Commission VII

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:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

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

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

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:: [VII/3: INFORMATION EXTRACTION FROM HYPERSPECTRAL DATA]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: ANOMALY DETECTION AND COMPARATIVE ANALYSIS OF HYDROTHERMAL ALTERATION MATERIALS TROUGH HYPERSPECTRAL MULTISENSOR DATA IN THE TURRIALBA VOLCANO J. G. Rejas, J. Martinez-Frias, J. Bonatti, R. Martinez and M. Marchamalo

Document type:: Multivolume work

Structure type:: Chapter

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia ANOMALY DETECTION AND COMPARATIVE ANALYSIS OF HYDROTHERMAL ALTERATION MATERIALS TROUGH HYPERSPECTRAL MULTISENSOR DATA IN THE TURRIALBA VOLCANO J. G. Rejas ad J. Martinez-Frias ® J. Bonatti *, R. Martínez d and M. Marchamalo ? ? National Institute for Aerospace Technology, INTA. Ctra. de Ajalvir km 4 s/n 28850 Torrejón de Ardoz (Spain), rejasaj@inta.es ^Astrobiology Centre-Spanish National Research Council, INTA/CAB-CSIC. Ctra. de Aj alvir km 4 s/n 28850 Torrejón de Ardoz (Spain), jmfrias(d)cab.inta-csic.es * Costa Rica University, UCR. Campus UCR-San Pedro de Montes de Ocas s/n, 0125 San José (Costa Rica), jbonatti2011(@gmail.com “Technical University of Madrid, UPM. Ramiro de Maeztu, 7, 28040 Madrid (Spain), ruben. martinez@upm.es, miguel. marchamalo@upm.es Commission VII, WG VII/3 KEY WORDS: Spectral Anomaly, Hydrothermal Alteration, Hyperspectral, Multispectral, Multisensor. ABSTRACT: The aim of this work is the comparative study of the presence of hydrothermal alteration materials in the Turrialba volcano (Costa Rica) in relation with computed spectral anomalies from multitemporal and multisensor data adquired in spectral ranges of the visible (VIS), short wave infrared (SWIR) and thermal infrared (TIR). We used for this purposes hyperspectral and multispectral images from the HyMAP and MASTER airborne sensors, and ASTER and Hyperion scenes in a period between 2002 and 2010. Field radiometry was applied in order to remove the atmospheric contribution in an empirical line method. HYMAP and MASTER images were georeferenced directly thanks to positioning and orientation data that were measured at the same time in the acquisition campaign from an inertial system based on GPS/IMU. These two important steps were allowed the identification of spectral diagnostic bands of hydrothermal alteration minerals and the accuracy spatial correlation. Enviromental impact of the volcano activity has been studied through different vegetation indexes and soil patterns. Have been mapped hydrothermal materials in the crater of the volcano, in fact currently active, and their surrounding carrying out a principal components analysis differentiated for a high and low absorption bands to characterize accumulations of kaolinite, illite, alunite and kaolinite+smectite, delimitating zones with the presence of these minerals. Spectral anomalies have been calculated on a comparative study of methods pixel and subpixel focused in thermal bands fused with high-resolution images. Results are presented as an approach based on expert whose main interest lies in the automated identification of patterns of hydrothermal altered materials without prior knowledge or poor information on the area. Previous works have shown the applications of ranges of the spectrum in MIR (Medium Infrared) and TIR, combined with other sources (Nasrabadi, 2008; Cipar et al., 2011). 1. INTRODUCTION Detection of spectral anomalies aims at extracting automatically pixels that show significant responses in relation of their surroundings. Several methods have been developed in the last decades, allowing a better understanding of the relationships between hyperspectral data dimensionality and the optimization of search procedures (Duran and Petrou, 2007; Shaum, 2005; Stein ef al., 2002) as well as the sub-pixel differentiation of the spectral mixture and its implications in anomalous responses (Bar et al., 2010; Eismann et al., 2009; Manolakis and Shaw, 2002). In other sense, image spectrometry has proven to be efficient in the characterization of minerals based on statistical methods using specific reflection and absorption bands. Hyperspectral configurations in SWIR and VNIR (Visible-Near Infrared) have been successfully used for mapping hydrothermal alteration materials in different geological scenarios (Antôn-Pacheco et al., 2001; Crosta et al., 2003). An important aim in this research was to establish relationships that allow linking spectral anomalies with what can be called information anomalies and, though, identify information related to anomalous responses rather than simply spotting differences from the background. We aim at analysing the information obtained form detected anomalous responses. This work presents a multi-source approach, applied to the analysis of the correlations between spectral anomalies and hydrothermal materials in the Turrialba volcano complex, located in the Central Volcanic Range (Costa Rica). We analyse the influence of spectral resolution in the determination of the background, a critical aspect in the detection of anomalies. Results are compared with vegetation and soil indeces in an active volcanic environment. The increasing activity of this complex requires special attention and survey, because of its proximity to main urban areas in Costa Rica.

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