Segmentation result significantly affects subsequent image classification accuracy, however this study was the first to evaluate the correlation. The results are important for any attempts to automate the object-based classification process, because they reduce the amount of user intervention required to fine-tune the segmentation parameters. All unsupervised metrics that are not based on number of segments have a very strong correlation with all classification measures and are therefore reliable as indicators of land cover classification accuracy. On the other hand, correlation of supervised metrics is dependent on so many factors that it cannot be trusted as a reliable classification quality indicator. Algorithms for land cover classification studied in this paper are widely used; therefore, presented results are applicable to a wider area.
COBISS.SI-ID: 40688685
Systematic archaeoastronomical research recently accomplished in several regions of Mesoamerica has revealed the existence of architectural orientations corresponding to major and minor extremes of the Moon on the horizon. Particularly indicative are the results of quantitative analyses of alignment data from the Maya Lowlands, disclosing a prominent group of orientations that can be convincingly related to the major lunar extremes. The astronomically-motivated intentionality of these alignments is additionally supported by contextual evidence, particularly significant being the fact that most of them are concentrated along the northeast coast of the Yucatán peninsula, where lunar cult is known to have been important. Since the lunar orientations are regularly associated with those corresponding to the solstitial positions of the Sun, it is very likely that a special attention was paid to the full Moon extremes. This contribution also presents some independent evidence that sheds light on the cultural significance of lunar orientations.
COBISS.SI-ID: 41030701
The book presents the results of a study of architectural orientations measured at various archaeological sites on the northeast coast of the Yucatan peninsula, Mexico. The orientations to the major lunar extremes, which are quite rare elsewhere in Mesoamerica, constitute the most prominent group, most likely reflecting the fact that the worship of the goddess Ixchel, associated with the Moon, was very important in the region, particularly during the Postclassic period, when most of the buildings included in the study were constructed. The significance of lunar orientations can be accounted for by the Moon’s aquatic and fertility symbolism, which was likely based on the observed correlations between lunar cycles and the periodicity of climatic variations and other changes in natural environment. Solar orientations probably allowed the use of observational calendars similar in structure to those that have been documented in other parts of Mesoamerica and whose purpose was to facilitate a proper scheduling of seasonal activities. For one significant group of orientations on the northeast coast we propose some stellar motives, but the hypothesis requires further testing.
COBISS.SI-ID: 284672768