— Tag
#data-quality
2 posts tagged data-quality.
Every Coordinate You Own Is About to Change
The National Geodetic Survey is retiring NAD83 and NAVD88 -- the reference frames under essentially every coordinate American surveyors have produced for forty years -- with the modernized replacements targeted to arrive by the end of 2026. The ground will not move. Every label on it will. And the difference between a clean migration and years of quiet confusion is decided by something firms can only do beforehand: knowing exactly what their archive contains.
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.
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