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1:250 000 Scale Colour Raster Technical Specification
This technical specification provides detailed technical information about 1:250 000 Scale Colour Raster. It is targeted at technical users and software developers.
The following pages contain information about 1:250 000 Scale Colour Raster.
Specification
1:250 000 Scale Colour Raster
Number of tiles in Great Bitain
56 (edge matched)
Tile size
100 km by 100 km
Coverage
Great Britain
Availability
National coverage (in a single download)
Resolution
254 dots per inch (dpi)
Data structure
Raster
Storage volumes (GB coverage)
128 MB (compressed)
130 MB (uncompressed)
Update frequency
Quarterly: Annually (June)
Product legend
The 1:250 000 Scale Colour Raster product legend is maintained in English and Welsh. It defines all map symbols used in the product. You can download the legend through the product downloads page or use the links below:
Gazetteer
The 1:250 000 Scale Gazetteer includes approximately 25 500 points that cover the extent of the 56 100km by 100km tiles. The information is provided as a single file in ASCII text format and is included in the compressed download file.
Georeferencing
A complete set of georeferencing files for 1:25 000 Scale Colour Raster is available for free download on the Georeferencing files and land and sea tiles page of the OS website. The TIFF World Files (TFW) are for use in ESRI® ArcGIS and the TAB files for use in MapInfo®. To ensure that the georeferencing files work correctly, save them to the same directory as the map tile files.
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