II. Adding Layers and Manipulating Data in ArcGIS
There are two major steps that will help you analyze the crash data using GIS. First, visualizing is a critical step in analyzing GIS data. For this step, ArcGIS uses layers to graphically represent data. Once all layers have been added, the second step is to manipulate them in order to enhance the visualization of GIS data. The following steps will guide you through this process.