The OSNI 1:50,000 Raster Tile Layout grid consists of the OSNI 1:50,000 sheets that are referenced to the Irish Grid. It divides Northern Ireland into a systematic grid used to manage and organize the OSNI 1:50,000 raster dataset. Each tile covers 20km x20km and there are 56 tiles covering Northern Ireland. Coordinate System/Projection ESPG 29902 / TM65.
