1:25 000 Scale Colour Raster Product Guide
This document contains additional theoretical information related to 1:25 000 Scale Colour Raster. All users will find the Product Information document useful and informative.
Last updated
This document contains additional theoretical information related to 1:25 000 Scale Colour Raster. All users will find the Product Information document useful and informative.
Last updated
The 1:25 000 Scale Colour Raster data product mirrors the popular OS Explorer Map series, showing a detailed overview of environmental and leisure features across Great Britain. It can provide the ideal mapping backdrop upon which to overlay business information. The 1:25 000 Scale Colour Raster’s backdrop can then be overlaid with other Ordnance Survey vector products or a customer’s own geographic / business data; it can also provide a useful background map in its own right.
Screen images can be plotted to produce a high-quality map. An example of the data is shown below.
1:25 000 Scale Colour Raster is aimed at professional / business markets and its graphic specification can aid with the following:
Environmental applications
Leisure applications
Construction
Engineering
Planning and licence applications
Farm / estate / property management
Real estate
1:25 000 Scale Colour Raster is derived from the source data used to create its graphic counterpart, the OS Explorer Map series. Generalisation is used to emphasise, simplify, select and sometimes omit features to produce a cartographic representation of the landscape at a scale of 1:25 000.
The nominal scale of the product is 1:25 000, but the recommended minimum-to-maximum scale range is 1:8,000 to 1:25 000 scale.
1:25 000 Scale Colour Raster is available in National Grid coordinates, which are expressed in metres relative to an origin set to a point west of the Isles of Scilly. These coordinates can easily be spatially related to other surveys, drawings, datasets or Ordnance Survey products. A general introductory guide to the British National Grid (BNG) is available on the OS website.
Coverage is Great Britain only. 1:25 000 Scale Colour Raster is supplied in standard 10 km by 10 km tiles aligned to the National Grid.
1:25 000 Scale Colour Raster is updated via a revision programme. The revision programme mirrors that of the OS Explorer Map series, and is determined by assessing the following factors:
Known surveyed change
Change intelligence gathered from a range of sources
How long it's been since an area was last revised
Priority is given to prestige sites categorised as significant items of change, such as major road construction projects. Significant items of surveyed change relevant to the scale are captured during the revision programme.
Where a line feature ends by intersecting the tile edge, it is matched with its corresponding feature on the adjacent tile so that both features end on the same unique coordinate. The representation of detail across the tile edge will be of a cartographically acceptable standard when plotted or displayed at scale.
1:25 000 Scale Colour Raster is supplied to customers quarterly in March, June, September and December, incorporating any updates made by the revision programme.
