Laboratory Exercise 10

 

Creating Your Own Data


Background

This laboratory consists of exercises from Chapters23&24 of the lab text, Getting to Know ArcView GIS, with the data obtained from the accompanying CD-ROM (exercises 23a,b,c, & 24a,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, in chapter 23, you will learn how to create shapefiles by converting existing features into shapes and by drawing new shapes. Remember that shapefiles are the only files in which shapes are features you can edit in ArcView.

The problem posed in chapter 23 involves creating a feature based map over an aerial photo. As a geologist studying volcanic activity in the Mojave Desert, New rock samples have to be added to the existing data base. An existing theme is converted to a shape file, which then makes it editable. In the process, you can create a smaller theme from a larger theme. You will also create new themes and draw new shapes the theme, and save them as shapefiles.

In chapter 24, you will learn how to edit shapes in a theme by adding, deleting, and moving their vertices. You will also learn how to split and merge shapes and how to set rules for updating the shape attributes. The problem in chapter 24 involves updating sales territories, represented by polygons. One territory has to be enlarged, and the territory of a departing salesperson has to be split up. The exercise shows how an attribute of a split up territory is proportioned according to the area to the target territories.

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 23a,b,c,&24a,b,c. The path to the exercises may vary from PC to PC, so check with the lab instructor or lab coordinate.

Report Format

The following questions were taken from Chapter 23&24 and Exercises 23a,b,c&24a,b. Produce a printed copy for your own records.

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Q1. Why is it advantageous to save features in a shapefile format?


Q2. What is the difference between a graphic and a shape ?


Q3. How do select all features in a theme to be converted to a shape file?



Q4. List the files formed on a hard drive when a shapefile stored. .


Q5. How do you make a theme editable?


Q6. The function of the Autocomplete Tool is to .

Q7. How would you give the Volcano.shp theme a transparent fill pattern to let the air photo show through?


Q8. How do you edit a shape (i.e. move a vertex) without affecting it's neighbor?


Q9. When splitting Thompson's territory, what were the two values of Sales_Target that were formed?


Q10. How were the two values in Q9 calculated?



 

If this form, for some reason, does not work, submit your Word- formatted answers by way of e-mail to:

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