OSNI (Ordnance Survey of Northern Ireland) is the Northern Ireland Ordnance Survey National Transfer Format. These are polygon-based large scale maps. The tile naming conventions and scales supported are:
| Width | Scale | Typical tile name |
| 600m | 1:1250 | 00609SE1.ntf |
| 1.2km | 1:2500 | 00609SE.ntf |
| 2.4km | 1:5000 | 00609.ntf |
| 9.6km | 1:10 000 | 006.ntf |
See full list of Dataset Formats
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