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

2 859 (edge matched)

  • England: 1,508

  • Scotland: 1,130

  • Wales: 289

Tile size

10km by 10km

Availability

National coverage

Resolution

254 and 660 dots per inch

Data structure

Raster

Transfer formats

  • TIFF PackBits compressed

  • TIFF palette 8-bit (256 colours) with LZW* compression

  • GeoTIFF with LZW* compression

Storage volumes per tile

0.2–9 Mb compressed

Update frequency

Quarterly: March, June, September and December (change-only updates)

Product legend

Common mapping abbreviations used in the product

Additional technical information

Additional information, common to all colour raster map products is available through the Colour Raster Map Core principle pages. These pages provide an overview of the product and a technical specification covering:

Last updated

Was this helpful?

#345: Adding What's next networking links

Change request updated