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Andrew Gransden

SCT Map Line Definitions

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Andrew Gransden

Looking at the UK Sector File (UK.SCT), it contains a number of lines which start with a <name> <lat/long1><lat/long2> followed a series of lat/long defining each line. The lat/long1 and lat/long2 are all zero. Is this correct?

For example:

Merseyside Coastline N000.00.00.000 E000.00.00.000 N000.00.00.000 E000.00.00.000
N052.51.41.688 E000.10.38.924 N052.52.23.930 E000.10.27.311 32896

There are others with different cords:

EGCC Manchester MSA Cones  S999.00.00.000 E999.00.00.000 S999.00.00.000 E999.00.00.000

Can anyone help explain?

Edited by Andrew Gransden

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Luke Brown

Not 100% certain but would imagine it defines that north and eastern lat/long is defined as positive, whilst southern/western lat/long is defined as negative?

Maybe @Chris Pawley can explain?

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