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Geoinformation systems (GIS) is the most convenient instrument for accessing, visualizing, analyzing of spatial (geo-referencing) data, therefore further improvements of the on-line Black Sea GIS were carried out. The Black Sea GIS was developed at the basis of Mapserver cartographic service and MySQL database. GIS consists of independent and interacting subsystems that permit easily its extension. The improvement of the Black Sea GIS includes the regional and coastal data concerning the visualization of the Dolgaya spit dynamics. The Dolgaya spit is a large accumulative body of the Sea of Azov (Black Sea basin). For most part of the area of interest, these changes occur because of natural reasons, but the economic activities at the spit and in the Sea of Azov have a certain influence on the processes too, affecting the changes of the spit. The changes of the spit was determined using satellite images obtained from 1960 to 1970s by the U.S. Geological Survey, as well as, using modern photos and field studies. Two shores, the Dolgaya spit are significantly different in composition and in the processes which take place. The obtained data from satellite remote sensing, aerial and from field surveys were inserted in the Black Sea GIS. The new data for this particular area of interest made possible to provide on-line access and visualization of the maps concerning the Dolgaya spit dynamic changes, values of erosion and accumulation at base points, plots and images, and combine the visualization these data with other GIS information layers.
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