1. As you work through the lab, fill out Tables A and B below based on information from the lab introduction, exercises, course text, and lecture.  If time is short, you may want to leave some of the tables to fill out outside of section.

Table A.
 

Geographic Data Model	Vector	Raster	TIN
Briefly describe the essential characteristics of each data model.  Include the types of data generally represented by a particular data model (i.e., continuous or discontinuous).  Give an example of a likely geographic feature that would be represented by each model.

Table B.
(Go to the table in Word version or HTML version)
 

2. What are the data models for each of the layers?  What feature does each layer represent?  (be as specific as possible)

                          mystery1 --
                          mystery2 --
                          mystery3 --
                          mystery4 --
                          mystery5 --
                          mystery6 --
                          mystery7 --
                          mystery8 --

3. How similar are mystery5 and your converted layer?  Briefly describe the major differences between the two.  What is the cause of them?   What do you think was the source data from which mystery5 was derived?
 
 
 
 
 

4.  Which of the three layers (sbdem, sbtin, sbcountour) do you think was the original data layer?  Which is "second generation" and which is "third generation"? Why do you think this?
 
 
 
 
 

5.   Find each of these tools and determine what data model type(s) (or perhaps other file types) it takes as input:

                           a) Clip, Select, Intersect, Buffer, & most other Analysis Tools (all the same answer)
                           b) Visibility
                           c) Buffer Wizard
                           d) Build Geometric Network Wizard
                           e) SDTS Raster to Grid
                           f) Feature Class to Geodatabase Wizard
                           f) Image to Grid
                           g) Export to Interchange File
                           h) Join Tables
                           i) Centroid Labels

6. How many records are there?  What do FNODE# and TNODE# mean?  What other attribute information can you recognize or guess at in the table (pick 3 columns)?
 
 
 
 
 

7. How many counties are there in California?  Why do the AAT, PAT, and RAT have different numbers of records?  Explain the relationship between arc, polygon, and region.cty in this coverage.  What are the label and tic feature classes for?

Hints:  To figure out the answers, you will need to examine the tables.  In addition, you might want to use the Identify Tool in the Geography Preview.  Also use ArcInfo Help as described above.
 
 
 
 
 
 
 

8. Come up with an example of two simple (geographic) features that you might want to represent in a geodatabase as having a relationship.  Come up with some rules for the relationship describing directionality and data entry constraints.  This is just a conceptual exercise, so you do not have to actually create the relationship rules in the computer.  Creativity is fine for this question as long as you show that you understand the concept of relationships between features.