A Java plug-in is needed to see use the 3D viewer.
Picture below is a 3D representation of a simplified city landscape. A red ball represents the center of contaminats release. The scroll bars allow to position the center of contaminant release and change wind direction. Mouse buttons and grag allow to rotate/translate the scene.
The purpose of the simulation is to show the possibility of drastically reducing the time of predicting contamination levels by using pre-processed results of prior simulations.
After selecting an object from "SELECT OBJECT" list and pressing the "Fire" button, the simulation will start. The current count of particle hits on the object will show in the "Current" field label. The "Predicted" field label will immediately show the corresponding hit count obtained in prior simulations. A much faster response can be achieved because the predicted hit counts are retrieved from a database and not computed in real time. The accuracy of the results is determined by the number of particles used in simulations. The results retrieved from the database have higher accuracy because they were produced with the greater number of particles, which took significantly longer time than applet simulation can afford.
Since the whole database of hit counts is too large to be transfered over the network at once, the data are split into chunks, corresponding to small areas. The red frame shows the area corresponding to the currently loaded hit count data. Repeated release of aerosols from that area does not require repeated data transfers.
The approach enables to significantly reduce the time needed to obtain results on aerosol fallout, by replacing a full 3D simulation with database retrieval. This is especially important for express risk assessment in emergency situations.