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Scale Space Visualization of Dynamic Track Clusters in an Enterprise GIS

A situation monitor display provides the instantaneous view of the current situation in the backdrop of a digital map background for the operator to take appropriate decisions in near real-time. The situation monitor data mainly consists of tracks captured using various sensors. Displaying a large number of tracks with individual details in a limited size screen is computationally challenging and yields no good output as it will result in a cluttered display. Track clustering technique can be used for generating a seamless decluttered display of the situation picture. Existing clustering mechanisms do not adequately address clustering across map tiles in a tile pyramid. We propose the Tile Pyramid Based Track Clustering (TPTC) mechanism, which avoids cluttering the track display, together with Open Geospatial Consortium (OGC) Web Map Tile Service (WMTS) for delivering the clustered track data to the clients. Our approach builds clusters from the bottom of the tile pyramid to the top considering scale of the pyramid level as an important parameter for clustering. The results suggested that the proposed method can be effectively used for generating decluttered display of tracks within acceptable performance and response time limits.