Geog 206: Intro to GIS
Fall 2010
I. Answer the following questions based on Bolstad Chapter 2 and lecture.
1. What is a data model? Describe the two most commonly used data models.
A method to create the world and it's features in a computer. The two most common data models are Vector ,which uses points and coordinates to represent features, and Raster, which uses a grid and cells to represent features.
2. What is topology and why is it important?
"The study of geometric properties that do not change when the forms are bent, stretched or undergo similar geometric transformations." Topology is important because it helps create relationships between features.
3. What type of data model would be best for representing hillside slope? Justify your answer.
Vector data model is best for representing a hillside slope because it gives more detail in a small area and gives direct points and lines which can represent the elevation/slope best.
4. Describe the relationship between spatial detail and cell dimension with regard to raster models.
The relationship between spatial detail and cell dimension has to do with resolution. The ground is represented by a cell and depending on how detailed you want the ground to be you want more cells representing an area if more detail is needed.
5. What are the four types of attribute data? Give an example of each.
Nominal=Zip Codes, Ordinal=harness of minerals, Interval=degrees in Fahrenheit and Celsius, Ratio=weight
6. List two types of vector data file formats.
Shapefile and geodatabase
7. List two types of raster data file formats.
Grids and graphs
II. Answer the following questions using the data/tutorials supplied in Ormsby
Chapter 4.
8. You can do all of the following in ArcCatalog EXCEPT:
a. Identify features
b. Copy data
c. Select features
d. View metadata
9. In the Chapter 4 exercises, does the World.mdb geodatabase contain a feature dataset?
Yes
10. What are the names of the feature classes contained in the World.mdb geodatabase?
cities, countries, disapp_area, and world30
11. What data format does the flight_path.lyr layer file reference?
Vector digital data
12. What are two ways to add data to an ArcMap document?
In ArcCatalog click on data and drag to ArcMap box or in ArcMap click on the yellow diamond with the black plus sign in the main toolbar, which is the add data button.
13. How many features (records) exist in the dissap_area feature class?
699
14. How can you determine this using ArcCatalog?
Under Metadata --> Attributes and under details for dissap_area it says Number of records: 699
III. Complete the ESRI online module “Basics of the Geodatabase Data Model” and
post a screenshot of the certificate.
a. To access, click on the following url: http://training.esri.com/gateway/index.cfm?fa=mytraining.gateway
b. Go to My Virtual Campus Courses. You will have to create a new account if you do not already have one.
c. Once you create the account and log‐in, go to Start a new course.
d. Enter the course code I provided you and start the module. (I will post these code assignments on Moodle)
Due: Wednesday, September 15th, 2010
Announcement: Quiz #1 has been shifted to September 13th and will include all of the information from Lab #1 through Lab #3.
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