Autodesk 15606-011408-9005 Tutorial - Page 94

8 Click OK in the remaining two dialog boxes. The drawing location is now mapped to your drive alias. You can now open drawings in that folder without defining any further aliases. To continue this tutorial, go to Exercise 2: Georeference source drawings (page 86). Exercise 2: Georeference source drawings You can query objects from one drawing into another drawing of the same geographical area, even if the drawings use different coordinate systems. The queried objects are automatically converted to the assigned coordinate system. If a drawing does not use a known coordinate system, align the objects to the map manually. In this exercise, you georeference drawing objects by adding them to a map with a known coordinate system. In practice, you can obtain such a map from the local county or municipality. For example, for a drawing of city parcels, obtain a digital version of an assessor map of that city. Make sure that you know the coordinate system used to create that map. We refer to this map as the "target map." In this example, you connect to an SDF data store containing parcel information. You use the Rubber Sheet command to align the drawing objects with known locations in the target map. To georeference drawing objects 1 Create a drawing and assign a coordinate system. ■ Click ➤ New ➤ Drawing. Select the map2d.dwt template and click Open. ■ Assign a coordinate system. Switch to Map Explorer in the Task Pane (page 315). Right-click Current Drawing and click Coordinate System. Enter CA-I and click OK. 2 Connect to a parcel data store of the same geographical area. In this example, connect to the tutorial sample file PARCELS.SDF, which uses the coordinate system CA-I. ■ Click Data ➤ Connect to Data. 86 | Chapter 3 Tutorial: Moving From AutoCAD to AutoCAD Map 3D