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Getting Spatial With AutoCAD® Map

Richard E. Chappell
Geospatial Territory Manager
Rick.Chappell@gmail.com
www.richardchappell.com

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

Teamwork: Multi-user editing

Increase your effectiveness by sharing the load

Multi-User Editing – Tiled

Source Drawings Current Drawings

Multi-User Editing – Coincident (or segregated)

Source Drawings Current Drawings

Multi-User Editing – Other Formats

Source Drawings and Feature Data Current Drawings

Spaghetti and Meatballs: Working with
features

Getting to know the parts and pieces

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

Topology

Topology consists of these properties:
 Adjacency
 Connectivity
 Containment

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

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

It's not dumb data: Managing Attributes

The heart of the matter is information

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

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

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

Where is it? Spatial Analysis Techniques

The “New” Math

Network Analysis – Shortest Path

Network Analysis – Best Route

Network Analysis – Flood trace

Buffer Analysis

•Buffers can be created from
point, line and polygon
topologies
•Generates a new polygon
topology
•Can be a negative number

Overlay Analysis - Intersection

Only areas that appear in both the source and overlay topologies are
in the result topology

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.

Overlay Analysis - Clip

except where they are outside the boundary of the overlay topology.
The source topology is clipped to the outer boundary of the overlay
topology.

Overlay Analysis - Union

Areas that appear in either the source or the overlay topologies are in
the result topology.

Overlay Analysis - Erase

except where it is covered by the overlay topology. The area covered
by the overlay topology is erased from the source topology area.

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

Multiple Steps to get complex results

Au 2008 Gs100 1 P Getting Spatial With

Review Questions

Topology is a synonym of topography.
 True
 False

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

Review Questions

Which of the following analysis operations can be accomplished
without using spatial data?
 Buffer
 Overlay
 Calculate
 Intersection
 Clipping

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Au 2008 Gs100 1 P Getting Spatial With

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