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Resolving Coordinate System Issues in GIS: A Case Study on Indiana, Michigan, and Ohio Data

On July 13, 2011, Melita Kennedy discussed common problems that arise when GIS data does not align correctly across different states, particularly in Indiana, Michigan, and Ohio. The session focused on identifying unknown coordinate systems, their impact on data layering, and the tools like ArcMap and ArcCatalog to resolve these discrepancies. Key goals included finding layers with unknown systems and analyzing their spatial relationships with known data. Strategies for compliance with common coordinate systems and metadata importance were also explored.

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Resolving Coordinate System Issues in GIS: A Case Study on Indiana, Michigan, and Ohio Data

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  1. July 13, 2011 Why My Data Doesn’t Line Up Melita Kennedy

  2. Answer:

  3. Answer: Coordinate system problem

  4. Answer: Coordinate system problem • Missing • Incorrect • Geographic/datum transformation not set

  5. Scenario • Routing application for Indiana, Michigan, and Ohio. • Indiana and Michigan data are in the same coordinate system. • New Ohio data does not line up.

  6. Goals • Do any layers have an unknown coordinate system? • Where is the ‘unknown’ data relative to the ‘known’ data? • Use ArcMap to identify the unknown coordinate system • If found, use ArcCatalog to define the metadata

  7. Demonstration!

  8. Does it work? NO • Research for more information. • Metadata? • Data provider or source? • Similar data types (1:24k quad)? • Common coordinate systems used in the area? • Spatial Adjustment or Georeferencing toolbars

  9. Resources • EsriKnowledge Base (support.esri.com) • Article ID #: 23025 • FAQ:  Projection Basics: What the GIS professional needs to know • Article ID #: 24893 • HowTo:  Identify an unknown coordinate system using ArcMap • EPSG Geodetic Parameter Dataset • http://www.epsg-regisry.org or http://www.epsg.org

  10. Questions?

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