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I currently maintain an enterprise geodatabase where the data is projected in a state plane coordinate system. Recently the data has extended past state boundaries. The data units are in feet and polylines do contain M values. I am concerned measures and GIS lengths(lengths are very important in the database) could become skewed as GIS data extends farther away from state boundaries.

In order to address this issue I am considering projecting the data into a new database using a non-state, regionally based coordinate system such as an UTM Zone.

My questions are following:

  • Would if be acceptable to just leave the data in state plane knowing measures are maintained?
  • Are there any issues with projecting from state plane into UTM Zone?(I have never done this for an SDE database) Could English units to Metric Units be a concern?
  • Any suggestion or tips regarding this type of conversion?
  • Do you have a requirement saying the M values must match the polyline length? – Kirk Kuykendall Dec 18 '18 at 15:09
  • No shape and measure lengths are separate and independent values. Polyline measures are based on survey collection and linear referencing. All my reporting is done via GIS shape length because I don't have measures for all features. – GISMapper Dec 18 '18 at 15:54
  • My major concern would be change in shape length when projected into new system. – GISMapper Dec 18 '18 at 16:01
  • There isn't anything Esri-specific about this question, per se. If you Edit the question to provide details of which state plane, and your actual data envelope, you might get less opinion-based answers. – Vince Dec 18 '18 at 16:23
  • Specifically, what coordinate system are you currently using? – Kirk Kuykendall Dec 20 '18 at 3:11

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