Lecture0008

Lecture0008 - Lecture 8. GIS Analysis Part 1 A GIS analysis...

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Lecture 8. GIS Analysis Part 1 A GIS analysis is an iterative process that involves visualizing and combining geographic data to derive new information.
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Learning ArcGIS 9
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Analytical process
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Analytical process Define the problem Define the criteria Identify the data Plan the analysis Prepare the data for analysis Execute the analysis Examine and present the results
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Analytical process Define the problem. Describe the scope of the analysis in one or two sentences. If problem is broad, break it up into several smaller parts that can be individually analyzed with the GIS. Traffic is congested? Define the criteria. Depends on the purpose of analysis, a scientific methodology followed, or the data that is available. Define criteria in terms of specific distances, measurements, or attributes. Commute time is greater than 30 minutes. Identify the data. Determine features or location data that meet the criteria and data needed for orientation or for presentation of the analysis results. Find metadata such as the data source, purpose, permissions, coordinate system, and attribute descriptions. Data such as census, city streets, etc. is available.
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Analytical process Plan the analysis. Use a workflow diagram Sequence of steps Specific tool to use at each step Data required and produced by each tool
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Analytical process Prepare the data for analysis. For example, you may need to add a field to a table, edit or update features, correct data errors, and change or define coordinate systems. Execute the analysis. Follow the steps in the workflow diagram. Perform the analysis using a copy of your data. Keeping the original is especially important if analysis includes processes that change the original feature class, table, or database, such as combining feature classes, calculating new attribute values, or adding or removing features. Examine and present the results. Verify
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This note was uploaded on 12/15/2010 for the course SAS SAS 18 taught by Professor Weswallender during the Spring '10 term at UC Davis.

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Lecture0008 - Lecture 8. GIS Analysis Part 1 A GIS analysis...

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