2.2 ENVIRONMENTAL MODELING USING MOSQUITOES TRAP research, attention should be given to the type of connection established between the environmental model and the GIS software. In addition, the type of GIS software used is a concern. Tim and Jolly (1994) present a good overview of three types of model interfaces possible with GIS (Figure 2-1). Their paper describes the three levels of integration as 1) ad hoc integration, 2) partial integration, and 3) complete integration. In the first level, the GIS data structure and environmental model are developed independently. The data is extracted from GIS, the model run separately, and the output analyzed at the user'sdiscretion. The second level results in GIS playing more of an integrated role in the modeling. GIS supplies the data and then accepts the modeling results for processing and presentation. The third level consists of complete model development within the GIS software. The user has2.1 Electric motor2.2 Battery2.3 Wire2.4 Electric light