Figure 1a: Schematic diagram showing the main modules for MM5V1 and DREAM and the flowchart for the whole model system. The meteorological data and terrain/landuse data are given as input to MM5V1 or directly to DREAM. DATAGRID and TERRAIN are preprocessors to MM5V1. The source data are given as input to the Lagrangian model. Advanced techniques are implemented to visualize and animate the output both from MM5V1 and DREAM.