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: 10 km x 10 km

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 (6.7 mb)

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