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