High level summary:

1. Download codepoint open to get coordinates for postcodes.
http://opendata.ordnancesurvey.co.uk/

2. Use "convex hull" alogorithm to create a polygon based on postcodes.

3. Write the data as KML
http://code.google.com/apis/kml/

4. Plot on a map
http://econym.org.uk/gmap/



On 16 September 2010 14:39, martin <[email protected]> wrote:
> I work for a very small children charity and as part of a research
> project I'm looking at how I can create a map of the UK that is
> divided into what we would call "Regions", which each "Region"
> containing a small number of "Areas".
>
> * Each of the "Regions" would be shaded a different colour
> * Within each "Region" the constituent "Areas" would have a boundary
> line drawn around them
> * I also need a Key that shows what colour each "Region" equals (say
> green equals "Eastern")
>
> I've included some sample data below. The number 901 is simply the
> internal database code allocated to the "Region". Again the number 11
> is the internal database number for the "Area".
>
> You can see in this example data set that the "Eastern" region has an
> "Area" within it called "Beds. and Cambs". The "Area" Beds. and Cambs.
> is comprised of the postcodes "CB1" through to "SG19". Further down
> you can see that the "Area" North Herts has the postcodes AL1 - WD7
> and so the list would go on.
>
> Can anyone help create a map if I were to provide all of the boundary
> information (or provide an easy to understand example of how this
> would work!).
>
> Thanks :-;
>
> Region Region Name Area Area Name Postcode
> 901 Eastern 11 Beds. and Cambs. CB1
> 901 Eastern 11 Beds. and Cambs. CB2
> 901 Eastern 11 Beds. and Cambs. CB3
> 901 Eastern 11 Beds. and Cambs. CB4
> 901 Eastern 11 Beds. and Cambs. CB5
> 901 Eastern 11 Beds. and Cambs. CB6
> 901 Eastern 11 Beds. and Cambs. CB7
> 901 Eastern 11 Beds. and Cambs. LU7
> 901 Eastern 11 Beds. and Cambs. MK1
> 901 Eastern 11 Beds. and Cambs. MK10
> 901 Eastern 11 Beds. and Cambs. MK11
> 901 Eastern 11 Beds. and Cambs. MK12
> 901 Eastern 11 Beds. and Cambs. MK13
> 901 Eastern 11 Beds. and Cambs. MK14
> 901 Eastern 11 Beds. and Cambs. MK15
> 901 Eastern 11 Beds. and Cambs. MK16
> 901 Eastern 11 Beds. and Cambs. MK17
> 901 Eastern 11 Beds. and Cambs. MK19
> 901 Eastern 11 Beds. and Cambs. MK2
> 901 Eastern 11 Beds. and Cambs. MK3
> 901 Eastern 11 Beds. and Cambs. MK4
> 901 Eastern 11 Beds. and Cambs. MK40
> 901 Eastern 11 Beds. and Cambs. MK41
> 901 Eastern 11 Beds. and Cambs. MK42
> 901 Eastern 11 Beds. and Cambs. MK43
> 901 Eastern 11 Beds. and Cambs. MK44
> 901 Eastern 11 Beds. and Cambs. MK45
> 901 Eastern 11 Beds. and Cambs. MK46
> 901 Eastern 11 Beds. and Cambs. MK5
> 901 Eastern 11 Beds. and Cambs. MK6
> 901 Eastern 11 Beds. and Cambs. MK7
> 901 Eastern 11 Beds. and Cambs. MK8
> 901 Eastern 11 Beds. and Cambs. MK9
> 901 Eastern 11 Beds. and Cambs. PE13
> 901 Eastern 11 Beds. and Cambs. PE14
> 901 Eastern 11 Beds. and Cambs. PE15
> 901 Eastern 11 Beds. and Cambs. PE16
> 901 Eastern 11 Beds. and Cambs. PE17
> 901 Eastern 11 Beds. and Cambs. PE18
> 901 Eastern 11 Beds. and Cambs. PE19
> 901 Eastern 11 Beds. and Cambs. SG15
> 901 Eastern 11 Beds. and Cambs. SG16
> 901 Eastern 11 Beds. and Cambs. SG17
> 901 Eastern 11 Beds. and Cambs. SG18
> 901 Eastern 11 Beds. and Cambs. SG19
> 901 Eastern 12 North Herts. AL1
> 901 Eastern 12 North Herts. AL10
> 901 Eastern 12 North Herts. AL2
> 901 Eastern 12 North Herts. AL3
> 901 Eastern 12 North Herts. AL4
> 901 Eastern 12 North Herts. AL5
> 901 Eastern 12 North Herts. AL6
> 901 Eastern 12 North Herts. AL7
> 901 Eastern 12 North Herts. AL8
> 901 Eastern 12 North Herts. AL9
> 901 Eastern 12 North Herts. CM21
> 901 Eastern 12 North Herts. CM22
> 901 Eastern 12 North Herts. CM23
> 901 Eastern 12 North Herts. EN10
> 901 Eastern 12 North Herts. EN11
> 901 Eastern 12 North Herts. EN6
> 901 Eastern 12 North Herts. EN7
> 901 Eastern 12 North Herts. EN8
> 901 Eastern 12 North Herts. HP1
> 901 Eastern 12 North Herts. HP2
> 901 Eastern 12 North Herts. HP3
> 901 Eastern 12 North Herts. LU1
> 901 Eastern 12 North Herts. LU2
> 901 Eastern 12 North Herts. LU3
> 901 Eastern 12 North Herts. LU4
> 901 Eastern 12 North Herts. LU5
> 901 Eastern 12 North Herts. LU6
> 901 Eastern 12 North Herts. SG1
> 901 Eastern 12 North Herts. SG10
> 901 Eastern 12 North Herts. SG11
> 901 Eastern 12 North Herts. SG12
> 901 Eastern 12 North Herts. SG13
> 901 Eastern 12 North Herts. SG14
> 901 Eastern 12 North Herts. SG2
> 901 Eastern 12 North Herts. SG3
> 901 Eastern 12 North Herts. SG4
> 901 Eastern 12 North Herts. SG5
> 901 Eastern 12 North Herts. SG6
> 901 Eastern 12 North Herts. SG7
> 901 Eastern 12 North Herts. SG8
> 901 Eastern 12 North Herts. SG9
> 901 Eastern 12 North Herts. WD6
> 901 Eastern 12 North Herts. WD7
>
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