UNLV CEE 301 - AutoCAD® Map 3D and the CAD-to-GIS Workflow

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Introduction and ObjectivesAutoCAD® Map 3D and the CAD-to-GIS Workflow Katie Jacques – Microdesk GS110-2 Here’s the scenario: Your boss asks you to incorporate GIS data into your design drawings. You’re a CAD expert but a GIS novice. Where do you start? How do you get both sets of data to work for you and not against you? Attend this session to see a typical CAD-to-GIS workflow using AutoCAD Map 3D. Key Topics • Learn how to assign coordinate systems to your drawings • Explore different GIS data formats • Understand the pros and cons of importing data vs. FDO (Feature Data Object) connections • Learn how to use Map 3D to incorporate Civil 3D data Target Audience CAD users who need to learn about GIS, engineers, GIS managers, Municipal GIS users and utility workers. About the Speaker: As a GIS Specialist at Microdesk, Katie provides technical support, training, implementation, and consulting services for ESRI products, as well as integrated services with AutoCAD Map 3D and MapGuide. She has extensive field experience in GIS and GPS, and has been responsible for researching, analyzing, developing, and deploying organization-wide GIS systems and database solutions. Katie has a Masters degree in Environmental Conservation with a concentration in GIS from the University of New Hampshire. [email protected]® Map 3D and the CAD-to-GIS Workflow Introduction and Objectives This session covers the features and capabilities that Autodesk Map 3D 2008 offers for working with both CAD and GIS data. It is geared towards CAD users who are new to GIS and need to maximize the interoperability between the two data types. Who Needs Map 3D? Engineers Surveyors Drafters Town Planners Assessors Utility Workers GIS Managers GIS Analysts Anyone that can or does use GIS!! CAD to GIS Workflow Here is an example:AutoCAD® Map 3D and the CAD-to-GIS Workflow In the above scenario, the surveyor is collecting parcel data in the field, sending it to the engineer who then creates site planes and possibly an alignment using a right of way, who then exports the DWG data into an SDF for the GIS (or CAD) person to use it in Map 3D to create thematic maps. Assigning DWG Coordinate Systems When drafting in a Map, Land, or Civil 3D environment, a global coordinate system is essential in order to have CAD data align with GIS features as well as have positioning information relative to the ground. Otherwise, DWG files are put in an assumed coordinate system and have no relation to the location they are representing – even if they are drawn accurately and in scale. The root of GIS is in the coordinate information, which can typically be found in the Metadata that accompanies the files. Coordinate Transformations To transform the coordinate system of a drawing 1. Open a new drawing. 2. Attach the drawing whose coordinate system you want to transform. 3. In the new drawing, assign the new coordinate system to the current drawing. 1. If you have not already assigned a coordinate system to the original drawing, do that now. Assign the coordinate system that was used to create the original drawing.AutoCAD® Map 3D and the CAD-to-GIS Workflow To assign a coordinate system to a source drawing  Click Setup menu Assign Global Coordinate System.  In the Assign Global Coordinate System dialog box, under Source Drawings, click Select Drawings and select the source drawings. You cannot assign a coordinate system to a source drawing that currently has queried objects in the current drawing.  Under Source Drawings, enter the coordinate system code for the selected source drawings. If you do not know the code, click Select Coordinate System. In the Select Global Coordinate System dialog box, select a category. Select from a list of available coordinate systems. Click Properties to view the properties of the selected coordinate system. To remove an assigned coordinate system, in the Code box in the Assign Global Coordinate System dialog box, type a period.  Click OK. Define a query to bring in all objects from the source drawing. The easiest way to do this is to define a location condition and use the Boundary Type "All." This retrieves all objects in the source drawing. See Finding All Objects in a Specified Location. As the objects are retrieved from the source drawing into the current drawing, they are transformed from the coordinate system of the source drawing to the coordinate system of the current drawing. Once the objects are in the new drawing, you can detach the source drawing and save the new drawing. The objects are unchanged in the source drawing, but they use the new coordinate system in the new drawing. Exporting Civil 3D Data to SDF The ability to use Civil 3D data inside Map 3D for creating intelligent thematic maps is made possible using the spatial data format (SDF). The SDF is the proprietary Autodesk file format that contains spatial data (such as roads, cities, and countries) used in maps. The current version used in the SDF 3. Tip: You cannot maintain styling information when you export drawing objects to SDF, but you can include object attributes. When you export these layers, you will include the general object attributes, such as color and line weight, so you can reconstruct the styling later if you wish.AutoCAD® Map 3D and the CAD-to-GIS Workflow To export the layers to SDF 1. Click File menu Export as SDF. Export the drawing data to a geospatial file format. 2. Specify a name and location for the new SDF file and click OK. 3. On the Selection tab, click Select All. 4. On the Data tab, click Select Attributes and, under Object Properties, display the tree of attributes. 5. Select the General item under AcDbEntity and select the General attributes. 6. On the Options tab, do the following: o Select Treat Closed Polylines as Polygons. o Under Create, click Multiple Classes and, for Create Feature Class By, select By Layer. o To change any feature class name, select it and enter a new name.AutoCAD® Map 3D and the CAD-to-GIS Workflow 7. Click OK when you finish examining the feature class names. 8. Click OK in the Export dialog box to export the data. Once the data is exported to the SDF format, it can be added in using the FDO connection. FDO, or Feature Data Objects is an Autodesk software standard and general purpose API for accessing features and geospatial data regardless of the underlying


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UNLV CEE 301 - AutoCAD® Map 3D and the CAD-to-GIS Workflow

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