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For the complete documentation index, see llms.txt. This page is also available as Markdown.

Raster Specification

The following chapters include information about OS VectorMap District raster, file compression, symbology, georeferencing and formats.

Specification

  • Data Source: Derived data

  • Number of tiles in Great Britain: 2863 (edgematched)

  • Tile size: 10km x 10km

Because digital maps frequently cover very large areas they are split down into squares known as tiles, each of which covers part of an overall area.

  • Availability: National, country and tile supply available

  • Resolution: 254 dots per inch

  • Data structure: Raster

  • Data Specification: Selection of map features combined

  • Colour Palette: 256 fixed colours

  • Transfer format: TIFF 8-bit LZW* compressed

  • Storage Volume per tile: Compressed: approx. 6.7mb

  • Greyscale: A high-quality alternative to colour raster data is to use a GIS to convert data to a greyscale format.

*If LZW compressed formats are used then registration may be required.

OS VectorMap District is supplied in the following raster formats: TIFF 8-bit LZW compressed (6.7mb)

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