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Short presentation on spatial data, what it is, how it works and some common errors. Presented at Irish Computer Society seminar on Data Quality, Dublin, September 13 2010.
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GeoData – What's Special about Spatial?
Richard Cantwell
www.geographic.ie richard@geographic.ie twitter.com/GeoGraphicIE
Spatial data – data that is 'located in space'
Represent the curved earth on a flat screen or paper: Projections
Represent features: As points..
.. as lines..
.. as a series of areas.
Raster data.
inspire.jrc.ec.europa.eu
INSPIRE Directive:
Spatial Data Infrastructure
Transposed into Irish Law July 2010Fully implemented 2019
Covers:DataMetadataNetwork Services
John Snow's 'Cholera Map' from 1854
www.TheGhostMap.com
Mashup Crime data with current location
(GPS enabled phone)
Unintentional errors
Intentional errors
Scale / projection issues
Classification issues
Selective
Interpretation
Generalisation
Modifiable Areal Unit Problem (MAUP)
Trap Streets: The Map..
..and the reality.
Port-au-Prince OpenStreetMap as of 11th Jan 2010
Port-au-Prince OpenStreetMap 3 weeks later
www.geographic.ie
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