Web layouts reference a single map resource. The map resource references one or more layers. Each layer, in turn, references a data resource that provides the content for the layer. You can create new maps in Autodesk Infrastructure Studio, or load maps from AutoCAD Map 3D. When you create a new map, you must add layers and then specify the data to use with each layer.
For more information about creating a new map, see Working with Maps For more information about loading a map, see About DWG Files.