1:50,000 raster

Raster maps are static digital images - each pixel is geo-referenced to the Irish Grid.

This series is cartographically identical to the paper Discoverer series (1:50,000).

Key features

  • clear detailed information on roads, footpaths, woods, water features, important buildings and height contours
  • three distinct presentations
  • cartographically identical to the Discoverer series paper map showing Irish Grid lines
  • reduced colour version without Irish Grid lines suitable for overlaying vector data
  • basic detail version highlighting townland areas
  • all topographic features are joined across sheet edges, providing coverage of the entire country
  • compatible with Republic of Ireland Discovery map series - both map series have the same co-ordinate system, same data source in border areas and a similar cartographic style and feature content
  • fully geo-referenced and compatible with other OSNI data


  • backdrop mapping
  • development planning
  • environmental analysis
  • land-use planning
  • route planning
  • distance measurement

Technical information

  • derived directly from OSNI Discoverer database, resulting in a high resolution (300 dpi) quality colour image
  • can be displayed on most graphics software packages
  • up-to-date mapping, with each map reviewed for revision every six years
  • available in tiff, jpeg and ecw formats
  • area covered by each tile 20km x 20km
  • typical file size 65mb (tiff) 8mb (ecw)

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