A less expensive and more efficient alternative www.selleckchem.com/products/Vandetanib.html to map the spatial certainly distribution of imperviousness in such cases is to develop Inhibitors,Modulators,Libraries models that allow estimation of the degree of imperviousness inside medium-resolution image pixels (Landsat ETM+, ASTER,��). Over the past years, many sub-pixel regression methods and sub-pixel classification methods have been proposed to derive the proportion of impervious surfaces within a medium-resolution pixel directly from the available multi-spectral data: multiple regression [24], linear spectral unmixing [25-28], neural networks [29, 30] and decision trees [31-33]. Although the sub-pixel approach does not allow one to achieve the same degree of accuracy as when high-resolution data would be used, most studies report an average per pixel proportional error in the estimation of impervious surfaces of close to 10 %.
In this study, multiple layer perceptron (MLP) models were used for mapping the proportion of four major land-cover classes (impervious surfaces, vegetation, bare soil and water/shade), Inhibitors,Modulators,Libraries using both high-resolution and medium-resolution satellite data. First a detailed land-cover map was produced Inhibitors,Modulators,Libraries by classifying a 4-meter resolution multi-spectral Ikonos image covering Inhibitors,Modulators,Libraries part of the city centre and the south-eastern suburbs of Brussels and the adjacent Sonian Inhibitors,Modulators,Libraries Forest. The high-resolution land-cover map was then used to train a sub-pixel classification model that estimates surface cover proportions within the pixels of a medium-resolution image (Landsat ETM+) covering the entire Brussels agglomeration.
Land-cover class proportions derived from both Inhibitors,Modulators,Libraries the Inhibitors,Modulators,Libraries high-resolution classification and the medium-resolution sub-pixel classification were used to characterize the distribution of land cover within the urban classes of an existing land-use map, produced by the Flemish Government, and used by regional and local Cilengitide authorities and research institutions within the region. The ��remote sensing enhanced�� versions of the land-use map were used as input for a rainfall-runoff simulation for the upper part of the Woluwe River catchment, located in the southeastern part of Brussels. The effect of different methods for characterizing Inhibitors,Modulators,Libraries urban land cover on estimated peak discharges was examined.
Also the results obtained with high-resolution and medium-resolution land-cover data were compared.2.?Study area and data2.1.
Study areaThe Woluwe is a small river that is part of the Scheldt basin. The upper part of the Woluwe catchment GSK-3 Volasertib cost up to the Goubert gauge was selected as a study area (Figure 1). The upstream part of this area lies in the protected zone of the Sonian forest. Imatinib PDGFR inhibitor In the downstream part, the Woluwe River flows partially through several vaulted stretches and park and pond systems. The Upper Woluwe catchment comprises approximately 31 km2.