What does transformation warning mean?

  • Upon reopening your Assignment 1 project after completing the insert map portion, you encounter a transformation warning.

  • The projection-on-the-fly feature in ArcGIS Pro is not functioning correctly.

  • This results in different layers being misaligned on the map.

  • The misalignment can range from several centimetres to several metres.

What is causing this?

  • The projection used by the insert map differs from the World Imagery (Firefly) projection.

  • The Customized World from Space projection \(\neq\) WGS 1984 Web Mercator (auxiliary sphere).

  • ArcGIS Pro does not recognize an existing transformation path between these projections.

What to do?

  • Ignore the warning message:
    • The preferred approach for now.
    • We are only creating maps.
    • The study area is large.
    • Location accuracy is not a major concern.
    • A few meters of offset is not significant.
  • Other solutions to consider:
    • Ensure all layers in the map use the same projection.
    • Find or create an appropriate transformation method.
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