Ordnance Survey – Great Britain's national mapping agency
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Technical Information
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Specification |
1:250 000 Scale Colour Raster |
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Coverage |
Great Britain (England, Scotland and Wales) |
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Availability |
Order by:
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Data Source |
Road Maps Production Data |
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Data structure |
Raster |
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Scale |
Nominal scale is 1:250 000.
Recommended minimum to maximum scale range for viewing is 1:100 000 to 1:300 000 scale.
It is best viewed between 1:100 000 and 1:250 000 scale |
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Transfer formats |
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Colour Options |
Colour. |
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Storage volumes |
Great Britain |
England |
Scotland |
Wales |
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Uncompressed |
880Mb |
448Mb |
416Mb |
128Mb |
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Compressed |
128Mb |
78Mb |
52Mb |
25Mb |
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Tile size |
100km x 100km |
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Number of tiles in Great Britain |
Great Britain = 56
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Supply media |
CD |
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Resolution |
254 dots per inch or 100 dots per centimetre. |
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Georeferencing
To locate 1:250 000 Scale Colour Raster data tiles in their correct geographical position in a GIS they need to be 'georeferenced'.
More information and download the files>>>
TIFF files
TIFF files are supplied in accordance with the TIFF 6.0 standard
Legend
The 1:250 000 Scale Colour Raster legend is available to view or download as a PDF file. It provides a a glossary of symbols used to represent real-world features such as roads, churches and rivers.
View or download a PDF version of the legend (981 Kb)
View or download a Welsh version PDF of the legend (981 Kb)
User guide
The user guide contains information on the technical specification and product specification for 1:250 000 Scale Colour Raster to help you understand how to use the data.
View or download a PDF version of the user guide (995 Kb)
Frequently asked questions
What areas or regions can I order?
The product is also available by;
* Great Britain
* England
* Scotland
* Wales
Can I convert it into a monochrome image?
It depends on which software package you are using. Some packages have a facility whereby you can load the colour image onto a computer and, using one of the command drop-down menus, select the greyscale option. This will change the colours on an image to shades of grey (greyscale). This is not the same output as monochrome where features in the file are either black or white.
Can I georeference the data file?
To locate 1:250 000 Scale Raster data tiles in their correct geographical position in a GIS they need to be 'georeferenced'. Refer to the Technical Information or follow the link below about geo-referencing.
http://www.ordnancesurvey.co.uk/oswebsite/products/georeferencing/aboutpopup.html