Mid-Semester Lecture Exam - PowerPoint PPT Presentation

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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 – PowerPoint PPT presentation

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Title: Mid-Semester Lecture Exam


1
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

2
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

3
  • 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?

4
Tables Continued
  • Adding Fields and Records

5
There are several data types
  • There are two basic types common used

6
Data Types
 
It is very important to choose the right data
type.
7
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.

8
Very often you need a new field in a table.
9
Specify the Name and the Data Type
Integers No Decimals
-32,000 to 32,000
-2 billion to 2 billion
10
Numbers with Decimal Places
Precision is the number of digits to be stored.
Scale is the number of decimal places.
11
Date
Text
It is important to specify a length to
accommodate your attribute but not too long.
12
Calculating a Value
13
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14
The selected records are assigned the calculated
value
Notice that text values are enclosed in double
quotes
15
Calculating a Numeric
16
Convert from one data type to a different data
type
Text type
Numeric type
17
Add a new numeric FIPS field then calculate the
text field as a numeric field.
18
Create a New Table
19
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20
Open the new table in ArcMap and then add data
21
You can use ascii files
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