What is digitization ? Roofi Sarkar

     The digitization is a bit different from digitalization. Digitalization is a process in which things are shift to modern technological tools but the term is used specifically in modern mapping software e.g  ArcMap, GIS, AutoCAD or mechanical desktop etc. for mapping and cartography. 

     I work in a Govt. organization where I use ArcMap to draw maps. My basic duty is to convert the manual maps to digitized maps. It means I digitize the maps with roads, canals and other ground features which were not drawn in manual maps. I use different tools to draw a better maps. 

    ArcMap is very advanced software in which there are lot of tools. We can hardly know all of them. ArcMap can be used for various fields of life e.g engineering of all kinds, Geography of the world, All kinds of mapping and cartography etc. 

    There is a great toolbox in ArcMap. We normally use line, Point, Polygon features in this software to digitize maps but it is a ocean of tools with vast field of works to utilize them. 

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The British National Grid (BNG)

•The British National Grid (BNG) is based on the National Grid System of England, administered by the British Ordnance Survey. The true origin of the system is at 49 degrees north latitude and 2 degrees west longitude. The false origin is 400 km west and 100 km north. Scale at the central meridian is 0.9996. The first BNG designator defines a 500 km square. The second designator defines a 100 km square. The remaining numeric characters define 10 km, 1 km, 100 m, 10 m, or 1 m eastings and northings.

•  British National Grid 100 km Squares  

Transverse Mercator

Transverse Mercator

•Transverse Mercator projections result from projecting the sphere onto a cylinder tangent to a central meridian. Transverse Mercator maps are often used to portray areas with larger north-south than east-west extent. Distortion of scale, distance, direction and area increase away from the central meridian.

•Many national grid systems are based on the Transverse Mercator projection