CAD-GIS Integration Approaches with ARCGIS
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ESRI's ArcGIS software allows CAD data to be directly imported and used within the GIS platform without conversion. CAD data is represented as feature classes within ArcGIS and maintains geometry and attributes. Tools exist for exporting GIS data back to CAD formats while maintaining relationships. The Mapping Specification for DWG standard developed by ESRI helps improve interoperability between CAD and GIS data.
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CAD-GIS Integration Approaches with ARCGIS
- 1. CAD-GIS Integration approaches with ArcGIS Chris North ESRI Canada
- 2. Key points regarding ESRI’s CAD support ArcGIS CAD data support is core technology – ‘Out of the box’ – Does NOT require an extension CAD data can be directly read by ArcGIS – Does NOT require any conversion – Behavior similar to other feature datasets and classes Available at all license levels Supported file formats and versions: – AutoCAD DWG/DXF: Release 12 - 2008 – MicroStation DGN: 5.x – V8
- 3. CAD data in ArcGIS A vector data source that can be visualized, queried, analyzed, and converted Feature datasets that contain several feature classes Read only data source Input datasets for most tools Can serve as reference for data creation – Snapping
- 4. CAD data model in ArcGIS CAD data is comprised of: Geometry Attributes ABC CAD entity geometry is represented CAD properties and database links as GIS feature geometry are stored in attribute tables Coordinate World File System/Projection CAD data can be re-projected to CAD drawings can be transformed from overlay with other GIS layers local coordinates to real-world location
- 5. CAD datasets in ArcMap CAD feature datasets are organized into Group Layers in ArcMap Initially in a collapsed state CAD feature layer properties can be accessed via the Group Layer Properties dialog
- 6. CAD properties as feature attributes Common CAD properties – Color, level, linetype, handle, line weight, etc… User defined data – Block attributes – Tags – MS-Links CAD attributes support queries – Display – Geoprocessing input – Conversion
- 7. Blocks and Cells 3548 Typically consist of 1 B multiple Block/Cell entities/elements and Geometry Feature Class different geometries Point Can contain text and attributes 3548, 1, B Annotation ArcGIS represents the Polyline insertion point as a point feature Polygon
- 8. Tags and block attributes Values represented as feature attributes – Tags = Fields – Tag values = attributes DGN: Tag Sets are not an attribute DGN DWG
- 9. Coordinate Systems and Projections Coordinate Systems – CAD drawings may not initially have one defined – Not required - but recommended – Select, create or import from other dataset Projection files – Stores coordinate system info – Created in ArcCatalog – Can be copied and reused for other CAD files
- 10. Georeferencing toolbar Georeferencing toolbar – use mouse pointer to move layer and create control points in map – Implemented CAD layer support in Georeferencing toolbar – Leverage existing Georeferencing tools and commands for CAD transformations
- 11. World Files World Files – File based, two point transformation for CAD data – Uses the .wld file extension – Simple text file containing two lines with two pairs of coordinate values: <From X1, From Y1> <To X1, To Y1> <From X2, From Y2> <To X2, To Y2> UC2008 Technical Workshop 11
- 12. CAD to Geodatabase Tools ArcMap – Export Data – Copy & Paste (Edit session) ArcToolbox - Geoprocessing – Copy Features – Feature Class to Feature Class – Feature Class to Geodatabase – Import CAD Annotation
- 13. Geodatabase to CAD tool: Export to CAD Output features to native CAD format – DGN (V8 only) – DWG/DXF (R14 to R2007) Various levels of complexity – Geometry only – Standardized entities Preparation tools – Add CAD Fields – Add Field
- 14. Mapping Specification for DWG (MSD) Open source framework developed by ESRI for coding information in DWGs to define: – GIS feature classes + attributes – Coordinate systems Utilizes CAD data structures to define schema and store data Leveraged by ArcGIS CAD tools at 9.3 – CAD direct read/import tools – Export to CAD Provides improved interoperability between CAD and GIS
- 15. Mapping Specification for DWG (MSD) Available in the ArcGIS Online Help system: – http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm? TopicName=CAD_data_organization
- 16. Export to CAD: Creating MSD compliant DWGs Automatically generated by Export to CAD Organizes CAD entities into feature classes in DWG Attributes are embedded in CAD entities Stores coordinate system in DWG Recognized by ArcGIS Desktop at 9.3
- 17. Mapping Specification for DWG: Export to CAD Output DWG Pre-9.3 Source Geodatabase Output DWG @ 9.3
- 18. ArcGIS for AutoCAD: Overview Provides access to ArcGIS Server map services – Control map display – Identify map feature attributes
- 19. ArcGIS for AutoCAD: Capabilities Map Services – Georeferenced – Projections on-the-fly – Cartographic GIS symbology – Dynamic/On Demand display – Scale-dependent display – ArcGIS Server data management – Database access: IDENTIFY map service features
- 20. ArcGIS for AutoCAD + MSD Provides ability for users to – Read ArcGIS data in CAD systems – Organize and attribute CAD drawings for use in ArcGIS Solves the question ‘How do I export my feature attributes to a CAD drawing?’
- 21. MSD Feature Class Tools Tools to manage feature classes in DWGs – Define, Modify, Delete Feature Classes based on queries – Entities properties control feature class participation Schema definition – Add fields
- 22. MSD Feature Class Tools Specify CAD properties New feature class name and type Use property selectors Define schema and default values