TourerMap is a backdrop raster map product based on the Ordnance Survey 1:210,000 dataset. It consists of digital images, ideally suited for scales on screen in the range 1:200,000 to 1:30,000. There is also a vector layer of place names suitable for use with the Find command in a GIS.
TourerMap OSNI suggested applications
- Route planning;
- General backdrop mapping;
- Territory planning;
- Ideal for use on your intranet or the Internet.
TourerMap OSNI features & use
- Familiar map appearance, with cartographically positioned text;
- Main feature colours consistent with RangerMap OSNI and PlannerMap OSNI;
- Clear map details, optimised for computer displays;
- Assess terrain height with spot heights, contours and altitude tinting;
- Storage size has been minimised by reduction of colour depth;
- Gazetteer of approx 400 place names included;
- Fits with StratMap OSNI;
- Use memory effectively, as seamless tables load and unload images when required.
TourerMap OSNI technical information
A workspace or project file is supplied.
The nominal scale of these images is 1:250,000 (about 1 inch to 4 miles) and the resolution is 10 dots/mm (254 dpi). Each pixel represents 25m square.
The Irish Transverse Mercator Grid co-ordinate system is used.
The colour images all use the same 4-bit palette of 16 colours. These are web-safe colours that avoid dithering if you use any computer set to 256 colours or more. The edges between adjacent colours are slightly softened to improve the appearance. LZW compression is used.
The storage space required is 105 MB in TAB/TIFF format.
Main formats available: TIFF, JPEG and others, along with georeferencing files for use in GIS.
TourerMap OSNI coverage available
- Northern Ireland; or
- Selected area (priced per tile); and
- Great Britain (companion product - TourerMap - derived from the Ordnance Survey Great Britain 1:250,000 Scale Colour Raster dataset).