Detection of forest changes over French Guiana using ERS-1 and ASAR iamgery

Yrjö Rauste, Tuomas Häme, Heikki Ahola, N. Stach, Jean-Baptiste Henry

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    ERS-1 and ASAR imagery were used for mapping and monitoring the forest area of French Guiana for 1992/1993, 2003/2004, and 2006/2007. Imagery was ortho-rectified using the SRTM DEM. A least square algorithm was used to improve the residual geometric inaccuracies. For the ERS data, significantly better geometric performance could be achieved using the PGS processor (the so called Envisat processor) data than with the standard VMP processor. The image analysis used three SAR based features, which were computed of two to five acquisitions from the same location. The most effective feature in change detection is annual average amplitude. The planned future operative system uses annual SAR data acquisitions and sample point inventory using high-resolution optical data twice in decade. The study was part of the GMES (Global Monitoring for the Environment and Security) Service Element Forest Monitoring.
    Original languageEnglish
    Title of host publicationProceedings of Envisat Symposium 2007 (ESA SP-636). Montreux, Switzerland, 23 – 27 April 2007
    Place of PublicationNoordwijk, The Netherlands
    PublisherEuropean Space Agency (ESA)
    Number of pages6
    ISBN (Print)92-9291-200-1
    Publication statusPublished - 2007
    MoE publication typeNot Eligible


    • Change detection
    • French Guiana
    • ERS
    • ASAR
    • GMES


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