Understanding MGRS Precision Levels and Distance の座標変換

Technical Summary: The length of an MGRS coordinate directly defines the linear size of the grid square it represents, scaling from 10 kilometers down to 1 meter precision.
実務リスク警告

Using the wrong datum or applying coordinates without grid-to-ground correction can cause 1–400 metre positional errors — a leading cause of surveying negligence claims and contract disputes.

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MGRS (軍用グリッド参照システム) works by defining progressively smaller grid squares. The numeric digits at the end of the coordinate dictate the exact square size.

Precision Breakdown

  • 10-digit (e.g., 18T WL 84801 12201): 1-meter precision
  • 8-digit (e.g., 18T WL 8480 1220): 10-meter precision
  • 6-digit (e.g., 18T WL 848 122): 100-meter precision
  • 4-digit (e.g., 18T WL 84 12): 1,000-meter (1 km) precision
  • 2-digit (e.g., 18T WL 8 1): 10,000-meter (10 km) precision

Always remember that 'precision' refers to the grid cell size, not necessarily the absolute accuracy of the GPS fix taking the reading.

Verify Coordinates with Core ツール一覧

Always validate your site data before mobilizing construction or legal teams. Use our built-in coordinate converters to rule out fundamental geodetic errors:

よくある技術的な質問

What is a 10-digit MGRS coordinate accuracy?

A 10-digit MGRS coordinate represents a 1-meter by 1-meter square on the earth's surface. However, the true accuracy depends entirely on the GPS receiver establishing the coordinate.