| Feature size | Example feature | Point density required to give 66% probability that the feature will be visible | Point density required to give 95% probability that the feature will be visible |
|---|---|---|---|
| 10m | large earth work | 3500mm | 500mm |
| 1m | small earth work/ditch | 350mm | 50mm |
| 100mm | large stone masonry | 35mm | 5mm |
| 10mm | flint galleting/large tool marks | 3.5mm | 0.5mm |
| 1mm | weathered masonry | 0.35mm | 0.05mm |