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# Au 2008 Gs100 1 P Getting Spatial With

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AU 2008 Presentation - it was the first geospatial PowerTrack that year

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### Au 2008 Gs100 1 P Getting Spatial With

1. 1. Getting Spatial With AutoCAD® Map Richard E. Chappell Geospatial Territory Manager Rick.Chappell@gmail.com www.richardchappell.com
2. 2. Objectives After attending this session, you will be able to:  Work with AutoCAD Map in multi-user environments  Understand spatial analysis and some of its uses  Understand how data is used for spatial analysis  Create smarter AutoCAD Drawings for data mining  Perform common types of spatial analysis with AutoCAD Map
3. 3. Teamwork: Multi-user editing Increase your effectiveness by sharing the load
4. 4. Multi-User Editing – Tiled Source Drawings Current Drawings
5. 5. Multi-User Editing – Coincident (or segregated) Source Drawings Current Drawings
6. 6. Multi-User Editing – Other Formats Source Drawings and Feature Data Current Drawings
7. 7. Multi-User Demo
8. 8. Spaghetti and Meatballs: Working with features Getting to know the parts and pieces
9. 9. Raster Data
10. 10. Raster - Pixellation
11. 11. Vector Data
12. 12. Raster Vs. Vector  A point in a raster system is a single cell, but in a raster system is a coordinate (Accuracy depends on the data)  A line in a raster system is a series of cells – it can falsely imply width, but in a vector system is 2 points and the line between them  In a raster system, the accuracy is immediately apparent, while in a vector, it can be misleading
13. 13. Topology Topology consists of these properties:  Adjacency  Connectivity  Containment
14. 14. Objects Vs Features  Objects - AutoCAD drawing elements created and stored in the DWG  Defined by drawing properties – layer, color, etc  Outside objects can be imported to become objects  Features - Elements stored outside of the DWG file in database or similar file, and are only referenced in the DWG file.  No stylization properties  Organized as layers available from the Display Manager
15. 15. Topologies - Types Point (or Node) Topology  Created from AutoCAD points, blocks or text  A new object table gets created – TPMNODE_topologyname Lines (or network, link or chain) Topology  Created from lines, open polylines or arcs  A new object table gets created – TPMLINK_topologyname  If you create nodes at the same time, a node object table gets created as well Polygon Topology  Created from a set of lines, open polylines or arcs that enclose an area. It may or may not have a centroid  A new object table gets created – TPMCNTR_topologyname  A link tabe is defined, and a node may be defined
16. 16. Line Topology Demo
17. 17. Polygon Topology Demo
18. 18. It's not dumb data: Managing Attributes The heart of the matter is information
19. 19. Object Data  Data tables stored in the drawing  AutoCAD Map 3D only  Tables are automatically created during topology creation  Tables are created for data imported from other formats, such as ESRI Shape files  Create using ADEDEFDATA  Add records and attach to object with ADEATTACHDATA  View or edit the data with ADEEDITDATA  Only accessible to Map users  Best if data is relatively static, such as descriptive characteristics
20. 20. External Data  Outside databases  Can be connected to drawing objects  Accessible outside the drawing  Better for dynamic, changeable data  Connected to the DWG file through a Universal Data Link (UDL) file – named source.UDL  Generate the UDL file by  attaching database  define a link template - MAPDEFINELT  Generate data links - ADEGENLINK
21. 21. External Data Demo
22. 22. Database only – Joins and Calculates  Add additional attribute data to your GIS features  Once the join is made, these new attributes can be used for labeling, themes, and analysis.  Types of Joins  One-to-One Join  One-to-Many Join  Left Outer Join  Inner Join Calculations – generate new data based on other data
23. 23. Join and Calculation Demo
24. 24. Where is it? Spatial Analysis Techniques The “New” Math
25. 25. Network Analysis – Shortest Path
26. 26. Network Analysis – Best Route
27. 27. Network Analysis – Flood trace
28. 28. Buffer Analysis •Buffers can be created from point, line and polygon topologies •Generates a new polygon topology •Can be a negative number
29. 29. Network Analysis Demo
30. 30. Overlay Analysis - Intersection Only areas that appear in both the source and overlay topologies are in the result topology
31. 31. Overlay Analysis - Identity The result topology includes areas that appear in the source topology and areas in the overlay topology that are within the source topology boundary.
32. 32. Overlay Analysis - Clip The result topology includes areas that appear in the source topology except where they are outside the boundary of the overlay topology. The source topology is clipped to the outer boundary of the overlay topology.
33. 33. Overlay Analysis - Union Areas that appear in either the source or the overlay topologies are in the result topology.
34. 34. Overlay Analysis - Erase The result topology includes areas that appear in the source topology except where it is covered by the overlay topology. The area covered by the overlay topology is erased from the source topology area.
35. 35. Overlay Analysis - Paste The overlay topology is "pasted" on the source topology. The result topology includes the overlay topology and any areas of the source topology that extend beyond the boundaries of the overlay topology
36. 36. Dissolve
37. 37. Polygon Analysis Demo
38. 38. Multiple Steps to get complex results
39. 39. Review Questions Topology is a synonym of topography.  True  False
40. 40. Review Questions To find who owns the land where a new power pole is being installed, I could use a  Polygon Intersection  Line Buffer  Point in Polygon  Polygon Recode
41. 41. Review Questions Which of the following analysis operations can be accomplished without using spatial data?  Buffer  Overlay  Calculate  Intersection  Clipping