Community Mapping As A Socio-Technical Work Domain

Mark Iliffe, Robert Houghton and Jeremy Morley

Break It Down

Community Mapping

“local mapping, produced collaboratively, by local people and often incorporating alternative local knowledge” - Perkins 2007

Tandale, August 2011

(c) OpenStreetMap contributors, CC-BY-SA

(c) OpenStreetMap contributors, CC-BY-SA

http://www.flickr.com/photos/markiliffe/6147128797

Measuring VGI Data QualityQuality Metric Countries References

Completeness England, Germany,France, Haiti

Haklay (2010), Koukoletsos et al. (2012), Zelestra and Zipf (2010), Girres and Touya (2011), Koukoletsos (2012)

Logical Consistency

France Girres and Touya (2011)

Positional Accuracy

England, Germany, France, Haiti

Haklay (2010), Zelestra and Zipf (2010), Neis et al. (2012), Girres and Touya (2011), Koukoletsos (2012)

Thematic Accuracy

France, Haiti Girres and Touya (2011), Koukoletsos (2012)

Temporal Accuracy

France Girres and Touya (2011)

Usage and Purpose

France Girres and Touya (2011)

Definitive Total Length 4,728,128.50m

OSM Total Length 4,319,135.92m

Discrepancy 408,992.58m (8.65%)

HOW DO YOU MEASURE QUALITY WHEN THERE IS NO COMPARATIVE DATASET?

Work Domain Analysis

• Understand the system with a holistic approach, not just what happens, but what are the drivers and ‘values’ of the system to the physical objects.– Rassmussen et. al (1994) and Vicente (1999)

Future Work

• Thematic Mapping, understand the quality attributes and methodologies of Thematic Quality

• “Go all the way” with Work Domain Analysis– Getting past first base: Going all the way with

Cognitive Work Analysis, McIlroy, R and Stanton, N. Applied Ergonomics (2011),

References• Getting past first base: Going all the way with Cognitive Work Analysis, McIlroy, R and

Stanton, N. Applied Ergonomics (2011)• Perkins, C. (2007). Community Mapping. The Cartographic Journal, 44(2), 127–137. • Rasmussen, J., Pejtersen, A., Goodstein, L.P., 1994. Cognitive Systems Engineering. Wiley,

New York.• Vicente, K.J., 1999. Cognitive Work Analysis: Toward Safe, Productive, and Healthy

Computer-Based Work. Lawrence Erlbaum Associates, Mahwah, NJ.• Haklay, M. (2010). How good is volunteered geographical information? A comparative

study of OpenStreetMap and Ordnance Survey datasets. Environment and planning B: Planning and design, 37(4), 682–703.

• Girres, J.-F., & Touya, G. (2010). Quality Assessment of the French OpenStreetMap Dataset. Transactions in GIS, 14(4), 435–459.

• Neis, P., Zielstra, D., & Zipf, A. (2012). The Street Network Evolution of Crowdsourced Maps: OpenStreetMap in Germany 2007–2011. Future Internet, 1–21. doi:10.3390/fi4010001

• Koukoletsos, T. et al. (2012). A Framework for Quality Evaluation of VGI linear datasets. University College London.