Is a 0.5m GPS 誤差 Acceptable?
No, a 0.5-meter (50 cm) GPS error is fundamentally unacceptable for land surveying, property boundaries, and heavy construction, where tolerances are strictly 0.01m to 0.05m. However, a 0.5m error is acceptable for basic GIS mapping, forestry, and agriculture.
データと許容値テーブル
The following table outlines the exact parameters and tolerances associated with this scenario to help you gauge the severity of the geodetic error.
| Industry / Application | Acceptable Tolerance | Verdict for 0.5m Error |
|---|---|---|
| Property Boundary Survey | 0.02m - 0.05m | FAIL (Illegal) |
| Concrete/Foundation Layout | 0.01m (10mm) | FAIL (Severe) |
| Aviation Obstacle (FAA) | 0.5m | MARGINAL (Zero safety factor) |
| Agricultural Spraying | 1.0m - 2.0m | PASS (Acceptable) |
Geodetic Formula
Acceptable Error Margin = (Project Standard Tolerance) - (Receiver RMS Error + Datum Shift Error)
Official Regulatory Compliance Reference
ALTA/NSPS Land Title Survey Standards (0.07 feet + 50 ppm); FAA Area 3 Obstacle Validation (0.5m max vertical).