Mid-Semester Lecture Exam

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Mid-Semester Lecture Exam

• Vocabulary
• Obvious steps within GIS
• Selection and query processes
• Working with tables
• Classification concepts
• Projections
• What are they what do they change
• Coordinates how are they relevant

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Home Work 1
Dealing with an exchange format

• In ArcToolBox
• Coversion Tools
• Import to coverage
• Import from interchange file
• Define projection for coverage
• In ArcMap
• Data
• Export to shapefile
• Project shapefile to whatever you want

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• Data types raster vs. vector
• How does GIS differ from a mapping or CAD package
• The three basic components of ArcGIS
• Define vs Projection
• Metadata
• More questions about coordinates
• What information is critical for a coordinates to
  be relevant?
• Cardinality
• When do you use a join and when relate?

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Tables Continued

• Adding Fields and Records

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There are several data types

• There are two basic types common used

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Data Types
 
It is very important to choose the right data
type.
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ArcGIS can handle several tabular data formats

• Coverages use an INFO format. These are an older
  format, cumbersome, but still frequently used.
• A shapefile uses a .dbf format. Much more
  sophisticated than an INFO file. We are
  currently using .dbf files in the lab exercises.
• Geodatabases uses a RDBMS format. Very
  sophisticated and powerful but more complex. We
  will use them in a few weeks time.

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Very often you need a new field in a table.
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Specify the Name and the Data Type
Integers No Decimals
-32,000 to 32,000
-2 billion to 2 billion
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Numbers with Decimal Places
Precision is the number of digits to be stored.
Scale is the number of decimal places.
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Date
Text
It is important to specify a length to
accommodate your attribute but not too long.
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Calculating a Value
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The selected records are assigned the calculated
value
Notice that text values are enclosed in double
quotes
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Calculating a Numeric
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Convert from one data type to a different data
type
Text type
Numeric type
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Add a new numeric FIPS field then calculate the
text field as a numeric field.
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Create a New Table
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Open the new table in ArcMap and then add data
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You can use ascii files