140 likes | 231 Vues
Online Maps Sources of digital mapping. Nigel James Bodleian Library. What is digital mapping?. Raster mapping – scanned paper maps. Digital map data – viewed with specialist software. Choice depends user’s requirements. Raster mapping. No special software required.
E N D
Online Maps Sources of digital mapping Nigel James Bodleian Library
What is digital mapping? Raster mapping – scanned paper maps Digital map data – viewed with specialist software Choice depends user’s requirements
Raster mapping No special software required Can be inserted directly into a document Limited modification possible
Raster mapping Widely available on the WWW Both historic and modern mapping Remote sensing imagery available Free access does not mean free to use!
Digital map data Controlled access – most data is licenced No charge to university members Can be extensively modified and adapted To suite specific needs
Resizing raster mapping Source: The World Factbook website
Resizing digital map data Source: Global Insight digital dataset
Resizing digital map data Source: Global Insight digital dataset
Sources of digital map data Bartholomew digital data 3 world datasets Europe dataset Great Britain dataset London dataset - available in the Bodleian Map Room and on OXLIP Global Insight world dataset Various other datasets – GB census boundaries and World thematic data, for example - available in the Bodleian Map Room only
Sources of digital map data Ordnance Survey Digital Data from DIGIMAP Available free to registered users Range of datasets available OS Strategi dataset 1:250 000 OS Land-line dataset 1:1250
Sources of digital map data Ordnance Survey Digital Data from DIGIMAP Raster data also available Georeferenced for use in a GIS OS 1:25 000 raster dataset OS 1:10 000 raster dataset