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Transverse mercator projection (centred on map)

<Map srs="+proj=tmerc +lon_0=-4 +datum=WGS84 +over">
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The transverse Mercator projection is conformal (angle-preserving), but distorts distances away from the meridian on which it is centred. The centre longitude lon_0 could also have been given as 4w (for West).

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