Laboratory Exercise 4

 

Managing Scale


Background

This laboratory consists of exercises from Chapter 12 of the lab text, Getting to Know ArcView GIS, with the data obtained from the accompanying CD-ROM (exercises 12a,b).

ArcView is a powerful desktop geographic information system (GIS) made by Environmental Systems Research Institute (ESRI). With ArcView, you can load any data that's linked to geographic locations and display it graphically as maps, charts and tables. You can also edit the data , change the way it's displayed, append additional data, create some of your own, perform queries to answer specific questions, or meet certain criteria, and analyze information statistically as well as spatially. Results can be shown as quality graphic presentations to print out or display your screen.

In this exercise, you will learn that when you zoom in or out in a view, or resize a view's window, that the scale automatically changes, and that you can directly specify the scale you want the view drawn to. You will also learn how to set minimum and maximum threshold scales for particular themes in a view so that they appear in the view when the scale values are set above or below the specified thresholds.

Procedure

With the supervision of your instructor, or lab coordinator, use the Getting to Know ArcView GIS CD-ROM to carry out the directions of exercises 12 a,b. The path to the exercises may vary from PC to PC, so check with the lab instructor or lab coordinate.

Report Format

Name:

Email:


Q1. How does the scale of a view change as you zoom in?



Q2. Map scale is defined as:



Q3. ArcView calculates a view's scale using which units?



Q4. Why was it necessary to set a maximum scale value for the "Streets" theme?







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