Lab 1: Geodatabase Topology

Introduction

This lab teaches you how to define geodatabase topology rules and use them to clean up your data.

Instructions

Do exercise # 7 (pages 90-121) in Chapter 3 of ArcGIS 9 Geodatabase Workbook (GeodatabaseWorkbook.pdf). The pdf file can be found in the I:\Students\Data\GIS\ArcGIS Documentation\ArcGIS9.1_documentation\ESRI_Library\Managing_data_with_ArcGIS folder. You can download the tutorial file (lab1.zip) here. You will need to unzip it. After you added the topology toolbar described on page 96, you need to click on the editor toolbar and select “start editing” to enable topology toolbar.

Additional Notes:

There is a version difference between the tutorial (9.1) and the software (9.3.1). Please replace steps 10 through 14 on page 120 of the Geodatabase Workbook with the following:

• click the selection tab at the bottom of the table of contents
• uncheck lots
• check lotlines, now even if you click on a lot while you're clicking a lot line, only the lot line will be selected
• using the edit select tool, click outside the lot to deselect it
• click the newly extended lot line so the one line is selected
• click the construct features tool
• click the button to split existing feature in target layer using selection
• make sure the target layer is lots
• click OK
• now make the lots selectable again and individually click the lots to make sure they split

Answer the following questions and produce a map showing the final topology errors, lotlines, and lots of the dataset you’ve edited.  Hand them in to the TA.  Labs should be typed, include your name and lab number, be well organized, and be stapled together.

1. What is a feature dataset in a geodatabase?
2. What is cluster tolerance? Describe how class ranks work when applying cluster tolerance in a topology.