Non-Cylindrical Grid Mapping
Limit of Capability

This illustration shows the typical limitation of the four-point map-referencing geometry:-

The points circled in red are those used to reference the map.

The red grid lines were produced by creating a text overlay for each of the lat/long intersection points. RealMaps overlayed this file on the map in accordance with its normal four-point arithmetic but I coloured them in a paint package to make them stand out.

I think this illustrates the strengths and weaknesses of this geometric conversion quite well:-


Last Updated 25th July 2000

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