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#data-quality

3 posts tagged data-quality.

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— crs

A Foot Is Not a Foot

For sixty-three years the United States had two feet: the international foot the rest of the country adopted in 1959, and the US survey foot that surveyors kept. They differ by two parts per million -- about an eighth of an inch per mile, which is why nobody worried. Then you put that eighth of an inch into a state-plane coordinate with seven digits in front of the decimal, and it becomes six feet. The survey foot was officially retired at the end of 2022. Your archive did not get the memo.

September 2026 · 5 min read
— crs

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 originally targeted for the end of 2026 and now, with the public beta opened in September 2026, expected in 2027. 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.

August 2026 · 6 min read
— crs

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.

August 2026 · 5 min read

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