Autodesk 15606-011408-9320 User Guide - Page 155

Online Help Index layers data source properties 3 Specify data source properties as described in the online help. You can click the Help button in each secondary tab to get details about the options on the tab. Setting Style Properties for Layers Online Help Index layers style properties You can specify properties that control how data appears on a map. For example, you can specify the display (scale) ranges at which a layer is visible, the line color, and add labels to the map features. You can also set up a theme, which displays the data in varying styles to indicate different values in the data. Note Raster layers have different style properties from vector layers. For more information, see "Setting Style Properties for Raster Layers" on page 156. When specifying the style properties for a layer, you are setting up one or more style sets. Each style set has a display range and at least one style that controls how the data displays. By default, there is only one style set per layer, but you can add more style sets to display the data differently depending on the current scale. For example, you could create one style set to display roads with thick lines when you zoom in, and create a second style set that displays roads with thin lines when you zoom out.  You use the Styles tab of the Map Layer dialog box to set styles for a layer. For step-by-step instructions, choose Help Contents, click the Index tab, and look up "layers, style properties." Setting Style Properties for Layers | 155