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