Topology in ArcGIS

LEARNING OBJECTIVES

1. Define topology
2. Describe map topology
3. Describe geodatabase topology
4. Describe coincidence
5. Explain how topology helps with analysis and data integrity
6. Define cluster tolerance
7. Define ranks in a topology
8. List several topology rules
9. Describe topology validation
10. List several types of topology errors
11. Discuss 2 ways topology errors may be fixed.

TERMS TO KNOW

• topology
• map topology
  
• geodatabase topology
• connectivity
• adjacency
• containment
• validation
• topology errors
• data integrity
• coincidence
• cluster tolerance
• ranks
  

CLASS DISCUSSION

In ArcGIS there are 2 types of topology.

• Map Topology: Available at the ArcView license. Used during an edit session to ensure coincident features maintain coincidence while editing.

• Geodatabase Topology: Available only with ArcEditor and ArcInfo licenses. Powerful rule based topology that help with data validation.

** See supplement resources below for more information on both these topics.

Working with Geodatabase Topology - ESRI LIVE Training Seminar (recorded at an earlier date)

ACTIVE LEARNING EXERCISE

Creating and Editing Geodatabase Topology with ArcGIS Desktop (for ArcEditor and ArcInfo)

SUPPLEMENTAL RESOURCES

fom the ESRI WebHelp
About Topology
Basics of Map Topology
Topology in ArcGIS - Geodatabase Topology
Geodatabase Topology Rules

Module 5 - The geodatabase lecture - Part 2

LEARNING OBJECTIVES

• Describe how relationships work in the geodatabase
• Describe the different ways information is validated in the geodatabase
• Describe topology
• Describe map topology
• Describe geodatabase topology

DISCUSSION

Class discussion (slides 44 -61) - Advanced Functions of the Geodatabase - PowerPoint Supplement

Class Discussion - Topology

ESRI Webhelp:

• Relationships in ArcGIS
• About relationship classes
• About topology in ArcGIS

ACTIVE LEARNING EXERCISE

Module 4: Creating, Editing and Managing Geodatabases for ArcGIS Desktop

Virtual Campus Course is due before class next week.

STUDY QUESTIONS

1. What are the 3 types of relationships that can exist in the geodatabase?
2. What are the 4 types of cardinality that can exist in the geodatabase?
3. Describe relationship classes.
4. List and describe the 4 types of validation rules.

Module 4 - The Geodatabase

INTRODUCTION

We will be introducing the Geodatabase, what they are comprised of and the different types of geodatabases available at 9.3

LEARNING OBJECTIVES

1. Define the geodatabase
2. List the elements of the geodatabase
3. Describe how the geodatabase is different that other spatial data formats in it's handling of 'real-world' behaviors
4. What is an 'object' in a geodatabse?
5. Describe a domain in depth
6. Describe what domain split and merge policies are
7. Describe a subtype
8. Describe a feature class
9. Describe an object class
10. describe a feature dataset

TERMS TO KNOW

• Geographic database
• Geodatabase
• object-relational
• object
• File Geodatabse
• Personal geodatabase
• Scalable or ArcSDE geodatabase
• Relational Database Management System (RDBMS)
• domains
• subtypes
• feature class
• feature dataset
  

READING ASSIGNMENT

Class discussion (slides 1 - 43) - Introduction to the Geodatabase - PowerPoint Supplement

ESRI Webhelp:

• An overview of the geodatabase
  

• An overview of the spatial reference

• An overview of working with feature datasets

• An overview of attribute domains

• An overview of subtypes

ACTIVE LEARNING EXERCISE

Module 2&3: Creating, Editing and Managing Geodatabases for ArcGIS Desktop

Virtual Campus Module 1: Creating, Editing and Managing Geodatabase

Due next week:

Module 1: Creating, Editing and Managing Geodatabases.

Instructions:

1. Go to http://training.esri.com
2. Login (create an account if you do not have one)
3. Go to My Training
4. Go to My Virtual Campus Courses
5. Start a New Course
6. Enter the code you got in class
7. Complete Module 1
8. I will look at it next week at the beginning of class.

Lab Test: Working with CAD data

Follow the instructions below to complete the lab test.

Get the test and files here

Module 3 - CAD data in ArcGIS | Campus Mapping Project

LEARNING OBJECTIVES

1. Describe CAD data
2. Discuss the differences in GIS and CAD data
3. Define CAD dataset layer
4. Define CAD drawing layer
5. List the 3 most commonly used CAD formats
6. Describe the contents of a CAD drawing
7. Define world files and describe how they work
8. Georeference CAD data

TERMS TO KNOW

• CAD
• CAD feature datasets
• CAD drawing datasets
• world file
• projection file
• georeferencing
• transformation
• control points
• link table

DISCUSSION

Introduction to CAD data in ArcGIS

ACTIVE LEARNING EXERCISE

A-B Tech Asheville Campus Geodatabase Project

Module 2 - Introduction to data models / data types / the geodatabase

LEARNING OBJECTIVES

1. Describe the Coverage data format
2. Describe the Shapefile data format
3. Describe the Geodatabase data format
4. Describe the CAD data format
5. Compare and conrast each of the above data formats
6. List several other data formats used for storing geographic information

TERMS TO KNOW

• Describe the raster data model
• Describe the vector data model
• Define data format
• Coverage
• Shapefile
• Geodatabase
• CAD
• feature class
• feature dataset
• stored / shared topology
• coincident features

READING ASSIGNMENT

Modeling Our World - Chapter 4 and the ESRI support pages below

PowerPoint Supplement

From the ESRI support pages:

• What is a Coverage?
• Learn more about shapefiles
• Working with CAD data in ArcGIS
• Data formats supported in ArcGIS
  
• GIS Layer Field Names and Standard Fields

ACTIVE LEARNING EXERCISE

Working with different data formats exercise

The data for this exercise can be found on the server: H:\GIS\GIS_classes\GIS215\SpatialDataFormats

Copy it to your flash drive to complete this exercise.

STUDY QUESTIONS

1. List 4 disadvantages of the CAD data format
2. What is a geo-relational data model?
3. What are 3 disadvantages to the ArcInfo Coverage?
4. Describe the shapefile
5. How many files must be present for a shapefile to be considered whole?
6. What are 3 disadvantages to the shapefile?
7. Describe the geodatabase in 1 sentence.
8. List the geodatabase types.
9. What type of information is modeled well using raster data?
10. What type of information is modeled well using vector data?

HOMEWORK ... YES HOMEWORK

Working with CAD data in ArcGIS 9.2