Integrating CAD Data with ArcGIS

Transcription

1 Integrating CAD Data with ArcGIS

2 Agenda An Overview of CAD Drawings CAD Data Structure in ArcGIS Visualization Georeferencing Data Conversion ArcGIS for AutoCAD Q & A

3 CAD Drawings - Overview Widely used vector based spatial data format Standard format for many organizations Extensive 2D and 3D geometry support Entity attribution capabilities Multi-disciplinary usage Engineering, Surveying, Architecture

4 CAD Integration Scenarios Cartography CAD layers serve as map elements (focus or background) Database Integration CAD feature attributes link with other databases Spatial Analysis CAD feature classes interact with other GIS layers Editing CAD features serve as reference for new features, snapping Conversion CAD feature classes exported into GIS formats (and vice versa)

5 CAD Drawing Formats and Versions ArcGIS supports the two most common CAD file formats AutoCAD DWG/DXF MicroStation DGN Supported file versions: DWG/DXF AutoCAD Release 12 through AutoCAD 2009 DGN MicroStation 5.x through MicroStation V8

6 ArcGIS Direct Read Capabilities CAD Direct Read Built In ArcCatalog ArcMap ArcScene and ArcGlobe (to see 3D view of CAD data) Core technology Available at all ArcGIS license levels No conversion required No extensions required Data Interoperability

7 CAD Data Model in ArcGIS CAD data is comprised of: Geometry Attributes ABC CAD entity geometry is represented as GIS feature geometry Coordinate System/Projection CAD properties and database links are transferred to attribute tables World File CAD data can be projected to overlay with other GIS layers CAD drawings can be transformed from local coordinates to real-world location

8 CAD Data Structure in ArcGIS Viewable as separate feature classes and as a drawing dataset CAD feature classes vs. CAD drawing datasets Parcels.dgn Annotation Multipatch Parcels.dgn Point Polyline Polygon Text, tags and attribute definitions Polygons and surfaces used for 3D representation Drawing dataset represents the entire CAD file as a single layer Points, blocks and cells Lines, polylines, curves and arcs Closed areas such as polygons, ellipses and circles Parcels.prj Projection files define a coordinate system for a CAD dataset. They are recommended but not required.

9 CAD Data Visualization Feature and annotation rendering Directly reads CAD defined properties

10 CAD Feature Rendering Previous design ArcGIS 9.1 and earlier Only continuous lines in a single color Default font is Arial New design ArcGIS 9.2 and 9.3 Linetypes preserved Color definitions assigned by RGB values Lineweights and linetypes rendered automatically Text properties such as bold, italicized and orientation maintained True type fonts transfer seamlessly

11 ESRI-CAD Style DGN and DWG categories Additional symbols can be added More symbols to come in future releases

12 Georeferencing Defining Spatial Reference Coordinate systems and projection files Transformations and world files

13 Assigning Spatial Reference to CAD Data Coordinate Systems Initial use of CAD drawings in ArcGIS will not have coordinate system defined Can select, create or import from another dataset Not required, but recommended Projection Files Assigns coordinate system to CAD files Created in ArcCatalog CAD Feature Dataset Properties dialog Save as.prj file with same name and in same folder location as CAD file Can be copied and reused for other CAD drawings

14 CAD Transformations Two-point similarity transformation method Scale, Rotate, and Translate Aspect ratio always maintained Cannot skew or rubber sheet CAD drawing Transformation managed by.wld files World file must use CAD file name Must also reside in same folder Usage CAD drawings that are created in paper space CAD drawings that do not have a known coordinate system

15 Transformation Tools Transformations tab Located in the CAD feature Layer Properties dialog Type in coordinates to define transformation Apply scale factor and rotation angle by value

16 Transformation Tools Continued Georeferencing Toolbar Interactively move CAD layer and create control points in ArcMap

17 Universal Projection and World Files Universal Projection File ESRI_CAD.PRJ Applies same coordinate system to all CAD files in a workspace Universal World File ESRI_CAD.WLD Applies identical transformation to all CAD files in a workspace Useful for set of tiled CAD drawings

18 Data Conversion: CAD to GIS Converting CAD drawings to Geodatabase feature classes CAD ArcGIS

19 Why Convert CAD Data? Update existing Geodatabases New as-built information Geometry (linework) from recent survey New Geodatabase based on CAD data sources Tiled CAD drawings combined to create a seamless dataset Supporting database Editing Topology Edge matching; Rubber sheeting Advanced cartographic symbolization Representations; Maplex

20 Common Geoprocessing Tools for Import Copy Features Simple way to convert CAD feature class Feature Class to Feature Class Similar to Copy Features except includes a query builder Import CAD Annotation CAD text to GIS annotation feature classes Make Feature Layer Temporary files with field control (Selections) Select Similar to Make Feature Layer but creates output on disk Select Data Used in Model Builder only to select child data elements Merge Turns tiled CAD files into a single feature class Import from CAD Reformats the CAD data into predefined highly normalized tables and feature classes

21 Conversion Methods Export Data Quick way to convert CAD data Output data container not required Copy and Paste in Edit Session Copy features from CAD feature class Paste features into existing GDB feature class or shapefile Feature Class to Feature Class Wizard-driven tool Ability to query/select features for conversion Import from CAD and Import CAD Annotation Support advanced translation workflows

22 Preparing CAD Data for ArcGIS Organize and name layers/levels Create data with real-world coordinates Use blocks/cells for attributing objects i.e., points inside polygons or closed polyline areas Separate cartographic objects i.e., title, blocks, legends from geometry Use group cells or blocks selectively Consider exploding process and cell/block origin Use entities/elements currently supported by ArcGIS List of supported CAD entities available in ArcGIS Desktop Help Avoid use of splines when digitizing in CAD

23 Converting CAD Point Data to ArcGIS Point definition in CAD vs. GIS Line with zero length Block/Cell Marker symbol Grabbing point data from blocks/cells Where is the cell origin? Where is the block insertion point? Where will the marker symbol appear, i.e. data shift? Extraneous point data Insertion points for group blocks/cells Duplicate information Assign attributes Points inside polygons or closed polyline areas

24 Converting CAD Line Data to ArcGIS Polyline definition in CAD vs. GIS CAD: Line has two vertices Polyline has three or more vertices GIS: Polyline includes all line-types Closed polylines Duplicates polygon feature class Splines and B-Splines

25 Converting CAD Polygon Data to ArcGIS Polygon definition in CAD vs. GIS CAD: Polygon has minimum of four vertices Last vertex must be in same location as first vertex, i.e. manually closed GIS: Polygon has a minimum of three vertices Automatically closed Examples of Polygon Data Closed polylines Duplicates polyline feature class Hatch/Fill 2D and 3D objects Faces Shapes Solids Surfaces

26 Considerations for 3D CAD Data PolylineZ Consistent z-values Spikes PolygonZ Closed polyline with z-value Shape Solid Extrusion necessary? Multipatch Solid Textured surface Feature outline

27 Data Conversion: GIS to CAD Converting Geodatabase feature classes to CAD data ArcGIS CAD

28 Exporting GIS to CAD Formats Provides interoperability between GIS and CAD software Roundtrip workflow Enables GIS users to create CAD drawings without having CAD software Allows GIS users to generate data in standard CAD formats AutoCAD DWG/DXF MicroStation DGN User defined attribution and symbology Seed files

29 Seed Files for CAD Conversion Blank template used to define a new file Provides additional control for CAD drawing creation Symbology; Geometry; Layer/level structure CAD standards Used to control Blocks or Cell definitions in Export to CAD MicroStation requires seed file for design file creation Design plane, appropriate dimensions, units and origin, 2D or 3D

30 Mapping Specification for DWG (MSD) Open source framework Developed by ESRI Codes information in DWGs GIS feature classes + attributes Coordinate systems Utilizes CAD standards 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 Available in the ArcGIS Online Help system: cfm?topicname=cad_data_organization

31 Mapping Specification for DWG: Export to CAD Export Output DWG pre-9.3 Source Geodatabase Output DWG at 9.3

32 MSD Feature Class Tools Specify CAD properties New feature class name and type Use property selectors Define schema and default values

33 ArcGIS for AutoCAD Free ArcGIS Server based product Runs on AutoCAD 2007 and 2008 based products including Autodesk Map 3D, Civil, Land Desktop AutoCAD LT not supported Direct access to GIS data within AutoCAD

34 ArcGIS for AutoCAD Product Overview Free download available ( Simple plug-in to AutoCAD Allows ArcGIS Server map services to be accessed and displayed inside AutoCAD Key Features Map service display management Identify, copy and paste attributes to clipboard Assign, clear or export coordinate system definition of the CAD drawing Lays the groundwork for additional functionality

35 ArcGIS for AutoCAD Process Internet ArcGIS for AutoCAD GIS Server Map services directly accessible within AutoCAD Map Services

36 Resources and Training ArcGIS Desktop Help (Check Online for Updates!) New Instructor-Led Training! Working with CAD Data in ArcGIS Desktop Live Training Seminars Working with CAD Data in ArcGIS 9.2 Geoprocessing CAD Data with ArcGIS Authoring and Publishing Optimized Map Services Sample Drafting Toolbar (BETA) Check it out and give us feedback!

37 Resources and Training