engleski

GeoVRML of Bakar Bay - Visualization of Ecological Hazard

In this paper the principle of new standard for 3D geographical data - GeoVRML, is explained, as well as its purposefulness and future of development in geo-applications. The data from Croatian Topographic Map, scale 1:25000, area of Bakar are used for the analysis. The ecological problems of air, soil and sea pollution, the protection of living and working places and human and natural environment are especially difficult and gave more cause for concern in Bakar Bay area. The map was loaded as the geodetic base into AutoCAD Overlay where it was semi automatically vectorized and digitized. After that the base was geocoded in software AutoCAD Map. The resulting dataset was saved in DXF form and sorted with a program written in QBASIC. The software Surfer was used for 3D visualization. The conversion with software 3DEM resulted with VRML and GeoVRML files for Internet applications. The Internet-browser is used to visualize VRML and GeoVRML reality of 3D shape. The transfer of data and data processing is explained for conjunction with GIS system on the example of ArcView 3D environment. Possible application of this standard are in education, research and applied visualization for different purposes like showing different impacts on pollution in Bakar bay. The possibilities and limitations of 3D vectorizing module are discussed. This standard can be applied in science of measurement which is the major activity of geodesy, only through this standard it gets a new dimension of virtual reality. At its core, Geo-VRML is simply a 3D interchange format. It defines most of the commonly used semantics found in today's 3D applications such as hierarchical transformations, light sources, viewpoints, geometry, animation, fog, material properties, and texture mapping. VRML also serves as a simple, multi-platform language for publishing 3D Web pages. Main advantage of georeferenced virtual reality is that virtual object or group of them can shown at user mind that he is walking through space where he can find orientation. Next generation of 3D visualization is implementation of Java in to X3D and VRML97. The goal of this paper is to introduce the potential of advanced and innovative geoinformation technology in proper planning of revitalization of Bakar Bay. Three-dimensional virtual reality models of pollution effects on the environment, implemented in a standard GeoVRML, would be an excellent starting point for an integrated geoinformation system for monitoring and management of a precious natural resourcel.

visualization; GeoVRML

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