A new method for in-flight radiometric noise assessment: application to SPOT5

Véronique Pascal; Francois-Xavier Chaffaut; Philippe Kubik; Laurent Lebegue; Christophe Valorge; Mathieu Jung

doi:10.1117/12.565110

4 November 2004 A new method for in-flight radiometric noise assessment: application to SPOT5

Véronique Pascal, Francois-Xavier Chaffaut, Philippe Kubik, Laurent Lebegue, Christophe Valorge, Mathieu Jung

Proceedings Volume 5570, Sensors, Systems, and Next-Generation Satellites VIII; (2004) https://doi.org/10.1117/12.565110
Event: Remote Sensing, 2004, Maspalomas, Canary Islands, Spain

Abstract

Since SPOT1 launch in February 1986 and until SPOT5 launch in May 2002, the methods and means to insure the best quality of the images delivered to SPOT IMAGE customers have been continuously improved and updated. The quality of the corrected images is quantified through several figures of merit, including, for radiometric quality, the Signal-to-Noise Ratio (SNR). Radiometric noise is due to two separate phenomena: -column-wise noise: it represents on-board image chain performances. -line-wise noise: normalization defects (radiometric model deviations) may lead to visible “columns” on a uniform landscape. For each image, these two noises are combined in an “image noise” that quantifies the variations of the digital numbers on a uniform landscape. Different techniques can be used to assess these different noises in-flight. For SPOT1 to SPOT4, the on-board lamp is used for both normalization and SNR assessment. For SPOT5, without lamp unit, we use images acquired over the quasi-uniform landscapes of Antarctic and Greenland for normalization. However, uniformity of these landscapes is not sufficient to accurately measure the SNR. So, a new method experimented during SPOT3 in-flight commissioning phase and operational for SPOT5 is applied. It consists in using two images of the same landscape acquired simultaneously to eliminate the landscape contribution. This paper focuses on the presentation of this new method and compares its accuracy to the other methods. Finally, a comparison between flight measurements and ground measurements before launch is given.

Citation Download Citation

Véronique Pascal, Francois-Xavier Chaffaut, Philippe Kubik, Laurent Lebegue, Christophe Valorge, and Mathieu Jung "A new method for in-flight radiometric noise assessment: application to SPOT5", Proc. SPIE 5570, Sensors, Systems, and Next-Generation Satellites VIII, (4 November 2004); https://doi.org/10.1117/12.565110

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available