std::vector<DataElement*> de;
        de = Service<ModelServices>()->getElements(TypeConverter::toString<RasterElement>());
        std::vector<RasterElement*> rasters;
        for (std::vector<DataElement*>::const_iterator it = de.begin(); it != de.end(); it++)
        {
            rasters.push_back(static_cast<RasterElement*>(*it));
        }