— Tag
#state-plane
2 posts tagged state-plane.
One Digit, Half a State
Indiana's state-plane family is four EPSG codes that sit one digit apart: 2965, 2966, 2967, 2968. Two of them differ by half a state; two of them differ by tenths of a foot. Mislabel a file with the wrong one and you get either an error so loud somebody 'fixes' it wrong, or one so quiet nobody notices until a corner will not check. Here is how the family fits together, the two ways it fails, and the ten-minute habit that catches both.
When 'State Plane' Isn't State Plane: The Custom-Scale-Factor Trap
Some surveying firms apply a custom scale factor or rotation to their state-plane work to align with a local monument. The PNEZD output looks like normal state plane to any downstream tool -- but verification points land 5 to 50 feet off. Here's how to spot it, diagnose it, and fix it.
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