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    The data shows the extent of mining within Great Britain it was captured in 1990 by OVE ARUP on behalf of the Department of Environment as a series of paper maps and no updates have been carried out. The data has been converted to a digital format (ESRI shape file) by BGS in 1995. The original scale of the data was 1km square. The dataset has limited attribution indicating type i.e. metalliferous, rock, coal, deneholes (chalk), evaporites or ironstone, and whether definitive evidence was found. Although every effort has been made to attribute the digital data to the original maps some inconstancies may have arisen due to data conversion process.

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    This dataset comprises 2 collections of maps. The facsmile collection contains all the marginalia information from the original map as well as the map itself, while the georectified collection contains just the map with an associated index for locating them. Each collection comprises approximately 101 000 monochrome images at 6-inch (1:10560) scale. Each image is supplied in .tiff format with appropriate ArcView and MapInfo world files, and shows the topography for all areas of England, Wales and Scotland as either quarter or, in some cases, full sheets. The images will cover the approximate epochs 1880's, 1900's, 1910's, 1920's and 1930's, but note that coverage is not countrywide for each epoch. The data was purchased by BGS from Sitescope, who obtained it from three sources - Royal Geographical Society, Trinity College Dublin and the Ordnance Survey. The data is for internal use by BGS staff on projects, and is available via a customised application created for the network GDI enabling users to search for and load the maps of their choice. The dataset will have many uses across all the geoscientific disciplines across which BGS operates, and should be viewed as a valuable addition to the BGS archive. There has been a considerable amount of work done during 2005, 2006 and 2007 to improve the accuracy of the OS Historic Map Collection. All maps should now be located to +- 50m or better. This is the best that can be achieved cost effectively. There are a number of reasons why the maps are inaccurate. Firstly, the original maps are paper and many are over 100 years old. They have not been stored in perfect condition. The paper has become distorted to varying degrees over time. The maps were therefore not accurate before scanning. Secondly, different generations of maps will have used different surveying methods and different spatial referencing systems. The same geographical object will not necessarily be in the same spatial location on subsequent editions. Thirdly, we are discussing maps, not plans. There will be cartographic generalisations which will affect the spatial representation and location of geographic objects. Finally, the georectification was not done in BGS but by the company from whom we purchased the maps. The company no longer exists. We do not know the methodology used for georectification.

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    Contains digitised mine plan contours, spot heights and worked ground outlines on key coal seams from the Midland Valley in ASCII or ArcView format. Incomplete, only some seams and some areas digitised. All contours digitised on key seams, worked ground outlines simplified, spot heights digitised where no contours exist.