[a fool in paradise]

A large section of northwestern Harris County – particularly the Jersey Village area – is sinking rapidly, according to a University of Houston (UH) geologist who has analyzed GPS data measuring ground elevation in the Houston area.

Flying cars needed now more than ever.

[Squantos]

Your gold mine caving in down there buddy ?

Or have all the tunnels from Mexico collapsed ?

[esarlls3]

"Because GPS can pinpoint location with millimeter precision, it is an excellent tool to measure even the most subtle changes over time in the ground," Khan said.

Surely this researcher knows the difference between accuracy, precision, and resolution. Millimeter resolution on GPS readings does not imply that precision or accuracy.

Using enhanced GPS techniques may be able to get a differential accuracy of a few inches. But these measurements have not been available for reference until recently so the older measurements are less accurate.

Global Positioning System

Real Time Kinematic

Accuracy and Precision