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Page References

Incoming links Outgoing links
SectionE.2
SectionE.2

Version management

Difference between version and

At line 9 changed one line
!!E.2.1 Modelling and documenting spatial data
!!B.6.5 Modelling and documenting spatial data
At line 71 changed one line
Ideally, a location will be identified to the nearest metre within the National Grid. However, it is not uncommon to use less precise references – to the nearest 10 or 100m – by omitting the least significant digits. For example, a reference with only six figures after the letter code (for example SK123568) or with only 10 digits (3456898765) refers to a location with a 10m precision, while SK1257 or 34579877 have 100m precision. Clearly it is vital to treat locations supplied with 10 or 100m precision references with care: they frequently need to be interpreted to mean 'the location is somewhere in the square whose origin is specified by the grid reference' as opposed to “the location is within 10 or 100m of the reference”. For this reason both the original (source) formats of coordinates should be stored in HERs, as well as any 'GIS friendly' derived coordinate values (see also section [E.2.4|http://archaeologydataservice.ac.uk/ifp/Wiki.jsp?page=SectionE.2#section-SectionE.2-E.2.4PrecisionAndAccuracy]).
Ideally, a location will be identified to the nearest metre within the National Grid. However, it is not uncommon to use less precise references – to the nearest 10 or 100m – by omitting the least significant digits. For example, a reference with only six figures after the letter code (for example SK123568) or with only 10 digits (3456898765) refers to a location with a 10m precision, while SK1257 or 34579877 have 100m precision. Clearly it is vital to treat locations supplied with 10 or 100m precision references with care: they frequently need to be interpreted to mean 'the location is somewhere in the square whose origin is specified by the grid reference' as opposed to “the location is within 10 or 100m of the reference”. For this reason both the original (source) formats of coordinates should be stored in HERs, as well as any 'GIS friendly' derived coordinate values (see also section [B.6.8|http://archaeologydataservice.ac.uk/ifp/Wiki.jsp?page=SectionB.6#section-SectionB.6-B.6.8PrecisionAndAccuracy]).
At line 77 changed one line
!!E.2.2 Systems to work with spatial data (GIS)
!!B.6.6 Systems to work with spatial data (GIS)
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!!E.2.3 Sources of spatial data
!!B.6.7 Sources of spatial data
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!!E.2.4 Precision and accuracy
!!B.6.8 Precision and accuracy
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!!E.2.5 Useful websites and references
!!B.6.9 Useful websites and references
This page (revision-16) was last changed on 16-Mar-2015 13:48 by Sarah MacLean Top