The in-flight estimate of the modulation transfer function of PRISM optical sensor

Sebastien Saunier(1) and Dominique Sautreau(1)

(1) Earth Observation Quality Control, GAEL Consultant, Champs sur Marne, France


The Advanced Land Observing Satellite (ALOS) was launched on Jan 24th, 2006 by a Japan Aerospace Exploration Agency (JAXA) H-IIA launcher. It carries three remote sensing instruments: Advanced Visible and Near Infrared Radiometer type-2 (AVNIR-2), Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) and Phased Array Type L-band Synthetic Aperture Radar (PALSAR).

Within the framework of the ALOS Data European Node (ADEN), European Space Research INstitute (ESRIN) as part of European Space Agency (ESA), calibration topics are discussed with JAXA. An intensive work has been focused on the image quality of PRISM data and the estimate of the modulation transfer function (MTF).

This paper summarizes the methodology set at GAEL Consultant in order to estimate the PRISM MTF. In the frame of calibration validation science team, the MTF results computed on several man made targets are shared with JAXA for comparison. An MTF estimate based on numerous dataset may lead statistically to a consistent estimate of the MTF per radiometer (Backward, Forward, Nadir), per charge couple device number (CCD) and per direction (Along track and across track).

The first results magnify that the MTF is not stable along with the CCD, and depends on the orientation as well.

Keywords-component; Calibration, Image quality, Modulation Transfer Function.


Symposium presentation


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