A GIS analysis involves
visualizing and combining geographic data to derive new information. GIS
analysis does not solve problems directly; the information it produces is
used by people to draw conclusions and make informed decisions. Listed below
are key points you should remember about GIS analysis.
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GIS analysis is an iterative
process that includes clearly defining a problem, identifying criteria
and data, planning and executing the analysis, and evaluating and
presenting the results.
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An analysis plan can help you
identify necessary data and software tools, prevent mistakes, and save
time.
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GIS analysis often involves
creating queries to select features that meet attribute or locational
criteria. |
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To access feature attributes
stored outside the layer attribute table, you can create a join between
the attribute table and a nonspatial table. |
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Maps, graphs, tables, and
reports can be used to present analysis results. |
Review questions
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What three things should be
identified on a workflow diagram?
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How can you create a report
that lists the attributes of only some of the features in a layer?
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Why would you create a table
join?
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A workflow diagram
should identify the sequence of steps, the specific tool to use
at each step, and the data required and produced by each tool.
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To show the
attributes of only some features in a report, first create a
selected set of features, then create the report.
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You would join two
tables if you want to query a layer based on an attribute that
is stored outside the layer attribute table.
Key terms