The document provides an overview of spatial analysis tools in AutoCAD Map 3D. It discusses two approaches to spatial analysis - using topologies of AutoCAD objects or connecting to feature data using FDO. The hands-on exercises demonstrate how to create network and polygon topologies, perform network analysis, and analyze features using buffers and overlays both with and without topologies.

1. Getting Spatial:
Spatial Analysis Tools in AutoCAD Map 3D
Richard E Chappell
Geospatial Application Engineer
© 2009 Autodesk

2. Welcome
Richard Chappell – “Rick”
Geospatial Application Engineer
CADsoft Consulting, Inc
1295 W. Washington St., Suite 201,
Tempe, AZ 85281
480-820-0408
rick.chappell@cadsoft-consult.com
http://www.cadsoft-consult.com/blogs/geo/
http://www.linkedin.com/in/richardchappell
© 2009 Autodesk

3. Objectives
 Participants to gain a basic of the Spatial Analysis tools in
AutoCAD Map 3D 2010
 To differentiate between analysis with topologies and FDO
 To become familiar with AutoCAD Map topology
 To become familiar with network and polygon analysis with
topology
 To become familiar with analysis with FDO feature sources
© 2009 Autodesk

4. Agenda
 Discuss Spatial Analysis basics
 Discuss AutoCAD Map approaches
 Hands on practice of different methods
© 2009 Autodesk

5. Tell us who you are
 Name
 What do you do
 Experience with Autodesk products
 Why you’re here
© 2009 Autodesk

6. © 2009 Autodesk

7. Map Overview
© 2009 Autodesk

8. Spatial Analysis in AutoCAD Map 3D
AutoCAD Map provides a geospatial environment that is a hybrid
of drawing features and feature sources from Feature Data
Object connections.
 Both may be used for analysis
 AutoCAD objects require a topological relationship
 FDO feature layers can be analyzed natively without converting
© 2009 Autodesk

9. Topology
Three types of topology
 Point or Node
 Line or Network
 Knows the nodes at each end. Nodes know which lines are
connected.
 Polygon
 Knows the lines, and so the points, that bound it. Lines are aware of
right and left polygons
© 2009 Autodesk

10. Network Topology
 Each component of a network topology has a length, resistance,
and direction
 Network topology components, or links, are connected by nodes.
 In order for drawing geometry to be used to define a network
topology, the links must meet cleanly at the nodes, with no gaps
or overlaps
 “clean”
© 2009 Autodesk

11. Managing Topologies
Key Points
 Topologies are stored within a drawing as object data
 Topologies must be loaded to be used
 Network topologies contain information about length, direction,
and resistance
© 2009 Autodesk

12. Network Topology Creation
 Drawing cleanup is the key
 Keep lines used in topology on same layer
 Decide if you want blocks or other objects as nodes
Good layering and drawing techniques are essential
© 2009 Autodesk

13. Hands-On Exercise – Create a network topology
 Open Roads.dwg
 Examine the data by right-clicking on an object and selecting
properties
 The OD:Roads section are the object data attributes associated with
the drawing object (or geometry)
 In Map Explorer, right click topologies>Create
 In the Create Topology – Select Topology Type dialog box:
 Click Network
 For Topology Name, enter Streets
 For Topology Description, enter The Streets of Redding
 Click Next
 In the Create Network Topolgy – Select Links dialog box:
 Click Select All
 Click Select Layers
© 2009 Autodesk

14. Hands-On Exercise – Create a network topology
 In the Create Network Topology – Select Layers dialog box:
 Select the ROADS layer
 Click Select
 In the Create Network Topology – Select Links dialog box:
 Click Select All
 Click Select Layers
 In the Select Layers dialoge box
 Select the ISECTION-NODES
 Click Select
 In the Create Network Topology – Select Nodes dialog box
 Click Select Block Names
 In the Select Blocks dialog box
 Select INTERSECT
 Click Select
© 2009 Autodesk

15. Hands-On Exercise – Create a network topology
 In the Create Network Topology
 Select Nodes
 Next
 In Create Network Topology – Create New Nodes dialog box
 Check the Create New Nodes check box
 Layer – ISECTION-NODES
 Point Object for Node Creation, Select INTERSCT from the list
 Click Finish
 In the Map Explorer
 Expand the Topologies
 Note that Streets topology is shown with a Network topology icon
 Right-click on Streets>Statistics
 Right click on an object to compare the object data
© 2009 Autodesk

16. Network Topology Data
 ID of each link
 ID of each node
 Starting and ending node for each link
 Direction of each link
 Direct and reverse resistance valuesfor each link
 Resistance for each node.
© 2009 Autodesk

17. Network Topology Tools
 Shortest path
 Best Route
 Flood Trace
© 2009 Autodesk

18. Guidelines for Performing Network Analysis
 All links are initially defined as bidirectional
 All links initially carry a resistance value equal to their length
 All nodes initially carry a resistance value of 0
 The starting and ending nodes are based on the direction the
object was initially drawn in.
 Because initial values set to 0, store attribute data in other
associated data tables
 You can store additional data in object data tables or external
databases that are linked to your network topology to provide
additional value to network analyses
© 2009 Autodesk

19. Hands-On Exercise – Perform Network Analysis
 Right click ROADS > Analysis > Network Analysis
 In the Network Topology Analysis – Select Method dialog box
 Click Shortest Path
 Click Next
 In the Network Topology Analysis – Choose Locations dialog box
 Click Select Point
 In the drawing, pick anywhere on the map to establish a start point – Map will go to the nearest node
 A large red X is placed at the selected node
 Press Enter
 Select an End point in the same manner
 In the Network Topology Analysis – Resistance and Direction dialog box,
 Maximum Resistance – 1000000
 Click Next
 In the Network Topology Analysis – Output dialog box
 Ensure Highlight is checked
 Color: Red
 Click Finished
© 2009 Autodesk

20. Polygon Topology
 The geometry used to define polygon topology must be
extremely clean, with no gaps, overlaps, duplicates, or crossings.
The cleanup tools in Map 3D are designed to ensure this
 Polygons store their topological information in centroids. You can
choose to have AutoCAD Map 3D create centroids, or use
preexisting objects
 Polygon topology will create these object data tables:
 TPMCNTR_name
 TPMDESC_name
 TPMID_name
 TPMLINK_name
 TPMNODE_name
© 2009 Autodesk

21. Hands-On Exercise – Create a Polygon Topology
 Open poly_topol.dwg
 Start the Create Topology, and in the Create Topology dialog
box
 Click Polygon
 Name: Redding_Parcels
 Description: Parcels in Downtown Redding
 Click Next
 Links – All, Layers – parcels
 Nodes – Selelct manually
 Create new Nodes – Next
 Centroids – All, layers – APN_Labels
 Create New Centroids – Click Create, Layer – APN_LABELS,
ACAD_POINT
 Set Error markers - Finish
© 2009 Autodesk

22. Polygon Analysis with Topologies
 Intersect  Erase
 Union  Clip
 Identity  Paste
© 2009 Autodesk

23. Hands-On Exercise – Perform Polygon Topology Overlay Analysis
 Open polytopol_analysis.dwg
 In Map Explorer, right click on topologies and select Load to load
the topologies.
 Right click on either or both topologies and select Show
Geometry – Enter or escape to remove highlighting
 Right click on PARCEL_TOPO > Analysis >Overlay
 In the Topology Overlay Analysis – Analysis Type
 Identity, Next
 Select ZONING_TOPO as the Overlay Topology, Next
 For Output Topolgy,
 Name – PARCEL_ZONING
 Description – Parcels with Zoning Class
 Layer – Parcel_Zoning
© 2009 Autodesk

24. Hands-On Exercise – Perform Polygon Topology Overlay Analysis
 In the Output Attributes dialog box, select the Source and
Overlay Attributes Browse to identify which attributes to carry
into the new topology
 Add a name for result topology – Parcel_Zoning
© 2009 Autodesk

25. Analysis with FDO
 Buffers
 Overlays
© 2009 Autodesk

26. Hands-On Exercise – Filter table Data with Buffer
 Open Buffersredding.dwg – set Tool-based Ribbon
 Ensure Parcels and Water Pipes are connected
 On the View Ribbon > View
 click Named View
 Click BUFFER_ZONE
 On Analyze Ribbon > Feature > Feature Buffer
 Select feature – pick the water line near the center of the screen
 Distance 100 feet, Layer Buffer 100 feet, Select Merging Overlapping
Buffers
 Note Buffer feature source appears in Display Manager
© 2009 Autodesk

27. Hands-On Exercise – Filter table Data with Buffer
 In Display Manager, click on Parcels layer
 Click Table
 In the Data Table window, click Search to Select
 In the Search to Select dialog box
 Click Locate on Map > Touching any Part Of > Polygon
 Over the map, for Enter location Boundary, click select
 Select the new Buffer area
 Note the selected parcels
 In the Data Table window, click Options > Export
 Export the file
© 2009 Autodesk

28. Hands-On Exercise – Use Feature Overlay Analysis
 Open new drawing
 From Windows Explorer drag PARCELS.SDF and
CENSUS_BLOCK2000.SDF into the map
 On Analyze Ribbon > Feature > Feature Overlay
 Source – Parcels
 Overlay – CensusBlk2000
 Type – Identity
 Next
 Output
 Name – Parcel_Census.sdf
 Layer name – PARCEL_CENSUS
 Sliver Tolerance – Suggest
 Look at resulting data
© 2009 Autodesk

29. Tell us how we did
© 2009 Autodesk

30. Thank-You!
Rick Chappell
Geospatial Application Engineer
CADsoft Consulting, Inc
1295 W. Washington St., Suite 201, Tempe, AZ 85281
480-820-0408
rick.chappell@cadsoft-consult.com
http://www.cadsoft-consult.com/blogs/geo/
http://www.linkedin.com/in/richardchappell
www.cadsoft-consult.com
CAD Camp – Geospatial Day – Nov 19
http://www.cadsoft-consult.com/index.php?option=com_content&task=view&id=693&Itemid=197
© 2009 Autodesk