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A comment on How Crossrail was affected by the curvature of the Earth (2018). Parent comment

Re:How Crossrail was affected by the curvature of the Earth ... by and_viceversa on Thursday May 05, 2022 @03:50PM (#31277708)
For a U.S. analog, we use the State Plane system. The states have (multiple) custom projections to suit local accuracy needs. Like another commenter said, WGS 84 uses ellipsoidal coordinates that are not suitable for the Crossrail's construction. If it were really so easy, American states would "just use WGS 84" as well.
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