Stefan Dangel

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—Field and laboratory goniometers are widely used in the remote sensing community to assess spectrodirectional reflection properties of selected targets. Even when the same target and goniometer system are used, field and laboratory results cannot directly be compared due to inherent differences, mainly in the illumination conditions since actual(More)
In spectrodirectional Remote Sensing (RS) the Earth's surface reflectance characteristics are studied by means of their angular dimensions. Almost all natural surfaces exhibit an individual anisotropic reflectance behaviour due to the contrast between the optical properties of surface elements and background and the geometric surface properties of the(More)
  • Zagajewski B, Sobczak M, Wrzesień M, Jürg T Schopfer, Stefan Dangel, Tanya Rodriguez +2 others
  • 2006
Spectrodirectional experiments with goniometer systems are only able to observe approximations of truly directional surface reflectance properties (BRDF). The directly observed quantity in field experiments is called hemispherical directional reflectance factor (HDRF), corresponding to hemi-spherical illumination, which depends on the atmospheric(More)
Analysing databases, field and airborne spectrometer data, modelling studies and publications, it becomes obvious, that there is a lack of consistency in definitions of reflectance quantities throughout the imaging spectroscopy user community. One example is the term 'BRDF' assigned to significantly differing quantities, ranging from the bidirectional(More)
Field and laboratory goniometers are widely used in the remote sensing community to assess spectrodirectional reflectance properties of selected targets. Even when the same target and goniometer system are used, field and laboratory results cannot directly be compared due to inherent differences, mainly in the illumination conditions: typically goniometers(More)
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