1:25 000 Scale Colour Raster Technical Specification
This technical specification provides detailed technical information about 1:25 000 Scale Colour Raster. It is targeted at technical users and software developers.
1:25 000 Scale Colour Raster product specification
Number of tiles in Great Britain
2 873 (2 729 sea tiles)
The full and COU (Change-Only Update) tile lists for the product are available as Excel sheets from the 1:25 000 Scale Colour Raster Download page.
Tile size
10km by 10km
Availability
National coverage
Resolution
254 and 660 dots per inch
Data structure
Raster
Transfer formats
TIFF-PackBits
TIFF-LZW
GeoTIFF
Storage volumes per tile
0.2–9 Mb compressed
Update frequency
Quarterly: March, June, September and December (change-only updates)
Product legend
Maintained versions (in English and Welsh) of the 1:25 000 Scale Colour Raster legend, which defines all of the map symbols used in the product, can be found on the 1:25 000 Scale Colour Raster Downloads page.
Common mapping abbreviations used in the product
A full list of the common mapping abbreviations used in 1:25 000 Scale Colour Raster is available from the Abbreviations used on OS 1:25 000 and 1:50 000 scale mapping page.
Additional technical information
Additional information, common to all colour raster map products is available through the Contextual or Derived Mapping Fundamentals pages. These pages provide an overview of the product and a technical specification covering:
Last updated
Was this helpful?