Spatio-temporal visualization of urban crimes on a GIS grid
Suresh K. Lodha, Arvind Kumar Verma · 2000
We present several techniques for visualizing the temporal dimension of a Geographic Information System. Techniques include (i) pseudo-colored time-window display, (ii) side-by-side height bars, (iii) stacked time-aggregated cumulative bars, (iv) stacked order-preserving bus, (v) vertical time dimension, and (vi) multi-layered display. These techniques are presented in the context of an urban crime mapping application and extend the existing visualization techniques employed in this field. We discuss merits and demerits of the proposed and existing techniques as well as issues related to aggregating the sampled data on a grid. The graphical display and the user interface is achieved through the use of VRML and vrmlscript. Our approach highlights the efforts to combine geographic information visualization with WordWideWeb technologies.