Proceedings, XXth congress: Proceedings, XXth congress

Altan, M. Orhan

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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:: BRDF CORRECTION ON AVHRR IMAGERY FOR SPAIN H. Heisig

Document type:: Multivolume work

Structure type:: Chapter

BRDF CORRECTION ON AVHRR IMAGERY FOR SPAIN H. Heisig Institut für Photogrammetrie und Fernerkundung, Universität Karlsruhe, D-76137 Karlsruhe heisig@ipf.uni-karlsruhe.de TS 3 YF Youth Forum - Remote Sensing KEY WORDS: Remote Sensing, Radiometry, Correction, Model, Land Cover ABSTRACT The free reception of Advanced Very High Resolution Radiometer (AVHRR) data keeps a growing interest for the remote sensing community concerned with vegetation studies on regional and global scales. However, the use of AVHRR data for long-term quantitative monitoring requires consistent surface reflectance data. This implies correcting the effects from varying sun sensor target geometries in multitemporal AVHRR data sets described by the Bidirectional Reflectance Distribution Function (BRDF). In a joint research undertaken by the Geography Department of the University of Alcalá (Spain) and the Canadian Centre for Remote Sensing (CCRS) a new semi-empirical model, the Non-linear Temporal Angular Model (NTAM), has been applied for the BRDF correction of AVHRR data for Spain. Reflectance data derived from AVHRR channels I and 2 were corrected for BRDF effects by normalization to a standard viewing geometry. The study period was between May and September 2002. The required correction parameters were derived by model inversion. In order to obtain a good representation of the temporal and spatial dimensions of the data to be corrected, a sampling scheme was implemented. The land cover based approach of the NTAM was accounted for by the use of CORINE Land Cover data from Spain. A cloud mask algorithm was used to exclude cloud contaminated observations in the sampling data. The evaluation of the statistical parameters obtained from model inversion showed good results for practically all land cover classes in the two channels. Derived parameters allow for visualization of angular dependence of reflectance for different land cover classes. 1. INTRODUCTION Current research work at the Geography Department at the E University of Alcalä is strongly focussed on the field of fire risk dE; dL, assessment (Chuvieco 2002). Since 1998 the department T ‘receives AVHRR data in the High Resolution Picture " T Transmission (HRPT) format through an own receiver. These data are used for estimation of plant water content with the | purpose of incorporating these estimations in fire risk indices | | (Aguado et al., 2003; Chuvieco et al., 2003). Sun-synchronous polar-orbiting satellites like the National Oceanic and Atmospheric Administration (NOAA) AVHRR sensors are operated on must have such an orbital inclination that the rate of the resulting precession compensates for the motion of the Earth around the sun (Cracknell 1997). The satellites orbit tracks projected on the Earth's surface reveal à Figure 1: Concepts and parameters of the BRDF (Sandmeier & parallel shift of about one degree east per day. This results in Itten, 1999; modified) changing view angles for the same target within consecutive day passes. where: 0, 2 zenith incidence angle BRDF 0, = zenith reflection angle ¢; = azimuth incident angle Vegetation, as most other surfaces, does not scatter irradiance 0, = azimuth reflection angle in equal quantities in all directions. In fact, it shows a behaviour ¢ = phase angle far from being Lambertian (Dymond et al, 2001). Its reflectance depends on the angle of observation as well as on Parallel to the enhancement of BRDF measuring methods the angle of the incidence of the solar radiation. This bi- (goniometers, measurements from helicopters), considerable directional dependency lead to the idea of the BRDF effort has been spent on development and testing of analytical (Bidirectional Reflectance Distribution Function). The BRDF and empirical models to describe the BRDF (Chen & Cihlar, describes the ratio of radiance dLr [W m” sr! nm'!] reflected in 1997: Chopping, 2000; Hu et al., 1997; Ni et al., 1999; Ni & Li, one direction (8, $) to the irradiance dEi [W m^ nm"] from — 2900; O'Brien et al., 1998; Roujean et al., 1992; Wanner ct al.. direction (8; $) (Sandmeier & Itten, 1999). Figure 1 displays 1995), BRDF models potentially allow for prediction of the angles that the BRDF is dependent on. reflectance for any desired sun sensor target geometry. 40

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