TourerMap is a backdrop raster map product based on the Ordnance Survey 1:250,000 Scale Colour Raster dataset, made up of a set of raster images covering GB (including the Isle of Man). 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 suggested applications
- Route planning;
- General backdrop mapping;
- Territory planning;
- Ideal for use on your intranet or the Internet.
TourerMap features & use
- Familiar map appearance, with cartographically positioned text;
- Main feature colours consistent with OutlineMap, RangerMap and PlannerMap;
- 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;
- Find over 57,000 settlements: towns, cities, suburbs and villages;
- Supplied as 100km square images, available in any combination;
- Fits with StratMap;
- Use memory effectively, as seamless tables load and unload images when required.
TourerMap 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 British National 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 approximately 3.6Mb per 100km x 100km tile on average.
Main formats available: TIFF, JPEG and others, along with georeferencing files for use in GIS.
TourerMap coverage available
- Great Britain; or
- Selected area (priced per tile); and
- Northern Ireland (companion product –TourerMap OSNI - derived from Ordnance Survey of Northern Ireland 1:250,000 Scale Raster dataset).