This paper compares two methods of cloud flagging that were developed at the Deutscher Ž . Wetterdients DWD and at the Laboratory of Atmospheric Physics, University of Thessaloniki Ž . LAP . The two methods are applied to the same data set to uncover their similarities and differences. The LAP method aimed at flagging the quality of global UV irradiance spectral measurements with respect to the...

In this work we show how the variability of visualization methods like textures and glyphs can be used to enhance established methods like topology. A topology-based segmentation (Auer et al., 2011) serves as framework to map textures and place glyph exponents for two dimensional symmetric tensor fields. The textures encode physical properties of the underlying field and support the understandi...

mapping of groundwater nitrate can be useful in management of groundwater resources. the objectives of this study were to analyze the spatial variability of nitrate and to map its contamination in the lordegan aquifer and to evaluate the variations in nitrate variability and mapping during a year. then 32 wells were sampled four times during 2010. seasonal nitrate concentrations remained consta...

During recent years, oak decline has been widely spread across Brant’s oak (Quercus Brantii Lindl.) stands in the Zagros Mountains, Western Iran, which caused large-area forest dieback in several sites. Mapping the intensity and spatial distribution of forest dieback is essential for developing management and control strategies. This study evaluated a range of geostatistical and interpolation m...