geodata: what's special about spatial?
DESCRIPTION
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.TRANSCRIPT
GeoData – What's Special about Spatial?
Richard Cantwell
www.geographic.ie [email protected] 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