1:50 000 Scale Colour Raster: technical info and specifications

Technical information

Sample data | User guide | Updated tiles | FAQ's

Specification	1:50 000 Scale Colour Raster
Coverage	Complete national coverage of Great Britain – England, Scotland and Wales.
Availability	Order by; Great Britain England Scotland Wales user defined areas; specific tile identities; administrative region; or bounding box. Tiles are supplied whole and not clipped to fit geographic areas
Data source	Landranger^® production data
Data structure	Raster
Scale	Nominal scale is 1:50 000. Recommended minimum to maximum scale range is 1:15 000 to 1:60 000 scale.
Transfer format	TIFF Palette 8 bit (256 colours) uncompressed TIFF Palette 8 bit (256 colours) with LZW compression Windows^® BMP 8 bit colour (256 colours) uncompressed Windows BMP 8 bit colour (256 colours) with RLE compression PCX 8 bit (256 colours)
Colour options	Colour 1:50 000 Scale Colour Raster data consists of a palette of 256 colours.
	TIFF	TIFF (LZW)	BMP	BMP (RLE)	PCX
	15Mb	10Mb	15MB	14Mb	18Mb
Tile size	20 km x 20 km
Number of tiles in Great Britain	815 (edge-matched)
Supply Media	CD (orders less than 650MB) DVD (orders greater than 650MB where requested)
Resolution	254 dots per inch or 100 dots per centimetre.
Update Frequency	Change only update is available annually. Update usually issued in June.
Styling	A legend is available as a downloadable PDF file: View or download a PDF version of the legend (322 kb)
Georeferencing files	To locate 1:50 000 Scale Colour Raster data tiles in their correct geographical position in a GIS they need to be 'georeferenced'. More information and download the files>>>
Coordinate reference system	British National Grid (OSGB36)

User guide

The user guide contains information on the technical specification and product specification for 1:50 000 Scale Colour Raster to help you understand how to use the data.

View or download the PDF version of the user guide (2000 Kb)

Updated tiles

1:50 000 Scale Colour Raster is updated in June each year.

View a Microsoft® Excel list of all tiles in the latest (June 2009) update (48Kb)

View a Microsoft® Excel list of all tiles and their date of update (60Kb)

If you license this product from us, you can log in to view thumbnail images that indicate the changes that have been made to revised tiles.

Frequently asked questions

What is the data structure?

The data is supplied as an ASCII Text file, colon separated.

I take 1:50 000 Scale Colour Raster, can I order 1:50 000 Scale Gazetteer by my 1:50 000 Scale Colour Raster holdings?

No, 1:50 000 Scale Gazetteer data is supplied as Great Britain only.

Is Change Only Update available for 1:50 000 Scale Gazetteer?

No, the product is Refreshed annually in June.

Complete re-supply is delivered to customers. Change only update is not available; the Update Code field (see Content table on the Technical Information page for the product) indicates whether the record has changed since the previous supply.