EDINA Digimap’s OS Collection: Boundary Download Vivienne Carr James Crone

EDINA Digimap’s OS Collection:Boundary Download

Vivienne Carr

James Crone

Digimap Training Workshops

Meeting content

• Digimap’s OS Collection Data Download Services

• Digimap’s OS Collection Boundary Download:– What’s available?

• Code-point

• Code-point Polygons

• OS Boundary Line

• GB National Boundaries and GB National Grids

– Onward use of data

• Unzip data files

• Data formats & conversion

– Desktop sharing


Meeting content


• Digimap’s OS Collection Boundary Download:– What’s available?

• Code-point







– Desktop sharing


Data Download Services

• Accessed from Digimap’s OS Collection Home page


Data Download Services

• Data Download• MasterMap Download• Boundary Download• Gazetteer Download• Gazetteer Plus


OS Products available

http://www.edina.ac.uk/digimap/description/products/


Meeting content


• Digimap’s OS Collection Boundary Download:

– What’s available?

• Code-point







– Desktop sharing


Boundary Download Home Page

• OS Code-Point – postcode listings or postcode polygons

• OS Boundary lines – e.g. counties, unitary authorities, electoral areas

• National GB boundaries


Date of last updates by OS

• Code-Point, March 2009• Boundary Line:

– April 2009, NTF format– May 2009, other formats

• Put into Digimap service in September 2009


Meeting content




• Code-point







– Desktop sharing


Code-Point

• OS Code-Point: National Grid co-ordinates for a point within each postcode unit in Great Britain

• OS Code-Point Polygons: Digital postcode unit boundaries

• Available at area level (e.g. AB, CF) or district level (AB1, AB2 etc). District level not available in NTF format.


Code-Point at Area level

• Can select up to 5 postal areas• Vertical streets included in area files


Code-Point at District level

• First, select an area


Code-Point at District level

• Then select the districts of interest• Separate vertical street file provided for entire area, when you download district

files


Code-Point data

• Also provided: NHS region, NHS authority, County, District, Ward, Postcode Type


Code-Point

• Code-point data, on 1:10000 Scale Raster background


Code-Point Polygons

• Code-Point data and Code-Point Polygons, on 1:10000 Scale Raster background


Meeting content




• Code-point







– Desktop Sharing


Boundary Line

• Available: County, European constituencies, Greater London Authority, Metropolitan districts, Scottish parliamentary electoral region, Unitary Authorities, Westminster constituencies, Extent of the realm

• Boundary datasets for use with census datasets, available in UKBORDERS: http://edina.ac.uk/ukborders/


OS Boundary Line – SHP or MIF/MID

• Select boundary type > Receive one chosen boundary type for all areas


OS Boundary Line - NTF

• Select area > Receive all boundary types for one area


Boundary Line

• Scotland and Wales Constituencies, 1:25000 Raster background of Edinburgh area


Boundary Line

• Greater London Constituencies, labelled, 1:25000 Raster background


Meeting content




• Code-point







– Desktop sharing


GB National Boundaries & Grids

• National Boundaries have been derived from Ordnance Survey’s Strategi data

• National Grids have been created by Ordnance Survey


GB National Boundaries

• 4 options – GB, England, Scotland, Wales


GB National Grids

• 4 options – 1km, 5km, 10km, 100km


Meeting content




• Code-point







– Desktop sharing


Unzip process

1. Data.zip

2. Unzip Data.zip:

1. Contents.txt,2. Conditions.tx

t,3. Data files


Contents of Code-point download


Meeting content




• Code-point







– Desktop sharing


Data formats

• CSV – Comma Separated Values

• DXF – Drawing Exchange Format

• SHP – ArcView Shapefile

• MIF/MID – Map Info Interchange format

• NTF – National Transfer Format


CSV format

• Necessary to convert a CSV file to a DBF 4 file, prior to import to ArcGIS

• Can do this in MS Office 2003, but not in MS Office 2007– A possible workaround is to open the CSV file

with Open Office, then save as DBF


Save CSV as DBF4


Save CSV as DBF4


Shape files

• Shape files do not require any conversion prior to use in ArcGIS

• Remember to keep all files together - SHP, PRJ, DBF, SHX:


NTF format

• Conversion will be required before use in ArcGIS

• ESRI Productivity Suite (ArcGIS V9.2 or later) – this must be requested from CHEST separately, via your institutional CHEST representative.

• Map Manager (ArcGIS V9.1 or earlier)

• Either of these tools can be used to convert NTF files to ESRI Personal Geodatabase format


Meeting content




• Code-point







– Desktop sharing


Resources

• Digimap OS Collection Help pages – Boundary Download:– Download instructions– Code-Point and Code-Point Polygons user guides– Using NTF data with ArcGIS v3.x– Using NTF data with ArcGIS v9.x

• EDINA Training guides:http://edina.ac.uk/digimap/support/training/

• Ordnance Survey website:– General product information:http://www.ordnancesurvey.co.uk/oswebsite/products/

Documents

EDINA Digimap’s OS Collection: Boundary Download Vivienne Carr James Crone