Manfred Schroeder
RADIOMETRIC INTERCALIBRATION OF MOMS AND SPOT
BY VICARIOUS METHOD
M. Schroeder, R. Müller, P. Reinartz
German Aerospace Center, DLR
Remote Sensing Technology Institute, Image Science
P.O. Box 11 16
82234 Wessling, Germany
e-mail: Manfred.Schroeder@dlr.de
M. Dinguirard, L. Poutier, X. Briottet
ONERA/DOTA
2, avenue Edouard Belin
e-mail: dinguirard(@onecert.fr
Working Group I/1
KEYWORDS
Radiometric Calibration, Ground Reflectance, Atmospheric Modelling, MOMS, SPOT
ABSTRACT
The homogeneous test site of La Crau (South of France) was used for radiometric calibration of the MOMS-
camera onboard the Russian MIR-Station and of the HRV/HRVIR cameras on the SPOT-01 and SPOT-04
satellites. The test site has an extention of approx. 400 m x 400 m and is composed of bare soil and pebbles. For
the spectral characterisation of the test site reflectance measurements with field spectrometers as well as
multispectral images with airborne instruments from low flight altitude were obtained.
To determine atmospheric optical parameters the ground irradiance of the sun was measured during the time the
space cameras passed over the test site.
With the measured reflectances and atmospheric parameters the 6S-radiation transfer model was used to
calculate the spectral radiance reaching the space cameras. The paper describes the measuring techniques and
discusses the calibration results.
1. INTRODUCTION
ONERA and DLR have agreed to cooperate in the field of optical remote sensing systems calibration. In this
framework a joint field campaign by teams of ONERA / CNRS-LISE and DLR was carried out in 1998 at La
Crau test site for vicarious calibration of MOMS-2P and SPOT. Two days were used for measurements: 29 June
1999 with a SPOT-04 overflight and 2 July 1999 with overflights of SPOT-01 and MOMS-2P.
2. THELA CRAU TEST SITE AND ON GROUND INSTRUMENTATION
The La Crau test site is located in southeastern France at 4.87°E longitude and 43.50°N latitude about 50 km
northwest of Marseille. It is a flat area of about 60 km”. The ground is uniformly covered by pebbles and dry
grass-like vegetation (Fig. 1). From a certain distance the ground looks like a homogeneous flat surface of a
yellowish, brownish colour tone.
The climate in this region is dry and sunny and the optical properties of the ground vary little during the year.
For the calibration a section of 400 x 400 m” in the center of the test site was used (Fig 1). This center section is
called the calibration area [7].
278 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000.
