Testing the Radiometric Performance of Digital Photogrammetric Images: Vicarious vs. Laboratory Calibration on the Leica ADS40, a Study in Spain

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Abstract:

This paper deals with the vicarious calibration of a linear array sensor, ADS40, and the comparison and analysis with the laboratory calibration provided by the manufacturer. For this purpose, a specific test field located in the city of Ávila (Spain) was designed for the two different flights performed during the 8th and 9th of April, 2010 with a spatial resolution of 10 cm and 25 cm, respectively. In addition, a reflectance measurement campaign was performed during the flight using an ASD FieldSpec 3 Hi-Res spectroradiometer, observing a group of 24 targets which included natural and artificial surfaces. Two study cases were considered: with and without atmospheric correction. In order to take into account atmospheric effects, the reflectance method based on the radiative transfer model was applied to establish the relationship between sensor and ground magnitudes. Compared to the calibration results provided by the manufacturer, the results of the vicarious calibration are better. In particular, the root-mean-square grey value error (RMSE) reached through the vicarious calibration in the different reference surfaces is lower than for the laboratory calibration, which considers always the same atmospheric model. Finally, analyzing the stability of the calibration and its relation with the flying height, the calibration of the lower flight (10 cm) was extrapolated to the 25 cm flight, obtaining similar accuracies.

German
Dieser Artikel beschäftigt sich mit der Feldkalibrierung (vicarious calibration) der Luftbildzeilenkamera ADS40 und vergleicht die Ergebnisse mit denen der vom Hersteller gelieferten Laborkalibrierung. Zu diesem Zweck wurde in Ávila (Spanien) ein Testfeld angelegt, das am 8. und 9. April 2010 in zwei verschiedenen Höhen so überflogen wurde, dass eine Bodenauflösung (Ground Sample Distance, GSD) von 10 cm bzw. 25 cm entstand. Gleichzeitig mit der Überfliegung wurden 24 radiometrische Referenzflächen, die sowohl natürliche als auch künstliche Oberflächen besaßen, vermessen. Dabei kam das Feldspektrometer FieldSpec 3 Hi-Res der Firma ASD zum Einsatz. Die aufgenommenen Kanäle wurden sowohl unter Berücksichtigung eines Atmosphärenmodells als auch ohne ein solches ausgewertet. Als Atmosphärenmodell wurde das 6S (Second simulation of the satellite signal in the solar spectrum), Version 1.1, verwendet. Die Genauigkeit der Feldkalibrierung war etwas höher als die der Laborkalibrierung des Herstellers. Das zeigte sich insbesondere bei unterschiedlichen Oberflächen-materialien. Ein weiteres Ergebnis war, dass die Ergebnisse der Kalibrierung des niedrigeren Fluges (GSD 10 cm) mit nur einem geringen Genauigkeitsverlust auf die grö ßere Flughöhe (GSD 25 cm) extrapoliert werden konnten.

Keywords: ADS40; AERIAL IMAGES; RADIOMETRIC CALIBRATION; TEST FIELD

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/1432-8364/2012/0139

Publication date: October 1, 2012

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  • Photogrammetrie - Fernerkundung - Geoinformation (PFG) is an international scholarly journal covering the progress and application of photogrammetric methods, remote sensing technology and the intricately connected field of geoinformation processing.

    Papers published in PFG highlight new developments and applications of these technologies in practice. The journal hence addresses both researchers and student of these disciplines at academic institutions and universities and the downstream users in both the private sector and public administration.

    PFG places special editorial emphasis on the communication of new methodologies in data acquisition, new approaches to optimized processing and interpretation of all types of data which were acquired by photogrammetric methods, remote sensing, image processing and the computer-aided interpretation of such data in general.

    PFG is the official journal of the German Society of Photogrammetry and Remote Sensing.
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