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I have a GIS dataset currently projected in Web Mercator.

Is there an option for a more accurate segmentation length projection when I need accurate lengths in Southeast Korea?

  • We're a little different from other sites; this isn't a discussion forum but a Q&A site. Please check out our short tour to learn about our focussed Q&A format. Are you using the ArcGIS Pro or ArcMap application to make these measurements? – PolyGeo Oct 1 at 4:10
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If I understand correctly you want to re-project your data? Check https://epsg.io/ for appropriate projections for your study area. For example, EPSG:5179 might work.

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Depending on which version you're using, see if Calculate Geometry Attributes tool is available. It can calculate the geodesic length of features.

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