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JRC Ispra is conducting a land use inventory and mapping experiment over the Departement of the Ardeche (France), which is considered representative of the so-called "Less-Favoured Areas" within the European Communities. The results of a uni-temporal classification of Landsat-5 TM data have confirmed that the spectral information from single-date imagery contains a high level of spectral confusion between cover types. It was expected that better mapping accuracy could be achieved with multi-temporal approaches. Four TM scenes from the year 1984 have been corrected for atmospheric absorption, scattering and pixel adjacency effects. Geometric registration was completed with sub-pixel accuracy. Time series of NDVI and Tasselled Cap features for important cover types were analysed and it was found that the multi-temporal vegetation index alone does not provide sufficient information for the classification in complex landscape units as the Ardeche. Tasseled Cap features, however, are considered a more efficient compromise between data reduction and the preservation of relevant image information. They are especially suited for unsupervised approaches since the principle of this transformation is related to physical concepts of optical remote sensing. Classification was performed by using simple parametric techniques such as minimum Euclidean distance mapping. It is demonstrated that the multi-temporal approach leads to distinctly improved results and allows detailed ground cover mapping even in structurally complex landscapes.

Additional information

Authors: HILL J, JRC Ispra Estab. (IT);MEGIER J, JRC Ispra Estab. (IT)
Bibliographic Reference: Paper presented: Igarss `89, Vancouver (CN), July 10-14, 1989
Availability: Available from (1) as Paper EN 34805 ORA
Record Number: 198910622 / Last updated on: 1994-12-01
Original language: en
Available languages: en