GIS 201 chapters 3 and 4
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What are some questions to consider when designing a map?
- Who will be using the map?
- Under what circumstances will the map be used?
- What objectives should the map achieve?
- How sensitive is the map information? (Privacy issues?)
What are the basic additions to a map?
- Indication of north
What properties of map features are affected by projection?
What projections preserve direction and shape at the expense of distance and area?
What projections preserve area and distance at the expense of direction and shape?
What do azimuthal projections typically preserve?
Area and distance, like conic projections.
What does "conformal" mean?
The shape is preserved.
What type of projection is Mercator?
What is the map extent?
The range of x-y values currently displayed in the data frame.
What are dynamic labels?
Those that are created from an attribute and redrawn every time the user changes the map view.
What 3 types of databases have been used?
- Flat file
What is a source table?
In a join, the table containing the information to be appended.
What is a destination table?
In a join, the table that receives the appended information.
What is cardinality?
The type of relationship between 2 tables (1-to-1, 1-to-many, many-to-1, or many-to-many).
What is the Rule of Joining?
There must be only 1 record in the source table for each record in the destination table.
What cardinalities allow a join to be performed?
1-to-1 and many-to-1; for others, a relate must be used.
When defining a number field, what is precision?
When defining a number field, what is scale?
The number of decimal places.
What is the basic unit of storage space for a computer?
Which way of storing text--binary or ASCII--is more efficient?
How are raster and image data stored?
As binary data.
How many significant digits does a single-precision floating-point field store in the mantissa?
Up to 8.
What format file do shapefiles use?
What database do personal geodatabases use?
Jet (the database underlying Microsoft Access).
What is an event layer?
A layer added from x-y points; not a feature class.
How to convert degrees-minutes-seconds to decimal degrees?
X in decimal degrees = degrees + minutes/60 + seconds/3600.
Do field names have to start with a letter?
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