Possibilities of MERIS for sub-pixel regional land cover mapping

R. Zurita Milla, M.E. Schaepman, J.G.P.W. Clevers

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

The Medium Resolution Imaging Spectrometer, MERIS, on board of ENVISAT-1 fulfils the information gap between the current high and low spatial resolution sensors. In this respect, the use of MERIS full resolution data (300 m pixel size) has a great potential for regional and global land cover mapping. However, the spectral and temporal resolutions of MERIS (15 narrow bands and a revisit time of 2-3 days, respectively) might be further exploited in order to get land cover information at a more detailed scale. The performance of MERIS for extracting sub-pixel land cover information was evaluated in this study. An iterative linear spectral unmixing method designed to optimize the number of endmembers per pixel was used to classify 2 MERIS full resolution images acquired over The Netherlands. The latest version of the Dutch land use database, the LGN5, was used as a reference dataset both for the validation and for the selection of the endmembers. This dataset was first thematically aggregated to the main 9 land cover types and then spatially aggregated from its original 25m to 300m. Because the fractions of the different land cover types present in each MERIS pixel were computed during the aggregation, a sub-pixel accuracy assessment could be done (in addition to the traditional assessment based on a hard classification). Results pointed out that MERIS has a great potential for providing sub-pixel land cover information because the classification accuracies were up to 60%. The correct number of endmembers to unmix every pixel was adequately identified by the iterative linear spectral unmixing. Future research efforts should be put in making use of the high revisit time of the MERIS sensor (temporal unmixing).
Original languageEnglish
Title of host publicationProceedings SPIE - Remote Sensing for Agriculture, Ecosystems, and Hydrology VII, Brugge 2005
EditorsM. Owe, G. D'Urso
Place of PublicationBruges
PublisherSPIE
Pages264-273
Volume5976
DOIs
Publication statusPublished - 2005
EventSPIE Conference 2005 -
Duration: 19 Sep 200519 Sep 2005

Conference

ConferenceSPIE Conference 2005
Period19/09/0519/09/05

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