Efficient procedures for quality assurance of data and services Anders Östman & Jan Zakariasson Swedesurvey AB
Swedesurvey AB An International Consultant company, owned by the Swedish Government Provides services worldwide within Land Governance, NSDI and Human Resource Development Acts as the Overseas Agency of Lantmäteriet, the Swedish mapping, cadastre and registry authority
Some statements about quality The characteristics of a product or service that bear on its ability to satisfy stated or implied needs (American society for quality) There is always another method for making a product cheaper and better (Kaizen concept) Quality assurance of geospatial data production is mainly seen as a cost (Eurogeographics) Investment decisions requires proper quality management (Self-evident)
Cartographic quality Readability Esthetic Basic measurements (distance, direction, area) Well established QA routines for production of paper maps
Geospatial data quality Data quality elements Accuracy Completeness Consistency Currentness Producer oriented
Quality challenges for SDI actors Data Providers Subcontractors Crowdsourcing Data migration Data harmonisation (INSPIRE, Mash-ups) Providers of network services Availability, Response time, Number of concurrent users Providers of web applications Fast Correct and relevant information Flexible, customizable to the needs Low cost Convenient Reliable
Case Study 1 Migration and harmonisation to INSPIRE NLS database NLS schema INSPIRE schema NLS shapefiles Source GML files Data extraction Shape to GML conversion Source consistency test Transformation rules Schema matching and mapping Schema transformation Target GML files Schema transformation report Source data consistency report Schema matching & mapping report Risk of accepting a bad data set = Probability * Cost
Input and refining processes Product Specification Quality Control Metadata DPS editor XML Schema ISO 19131 FME Quality Control routines CSW metadata update ISO 19113,ISO 19114, ISO 19138 (ISO 19157) Metadata DB Metadataeditor Metadata Portal ISO 19115 ISO 19139
ESDIN NMCA Partners Bundesamt für Kartographie und Geodäsie (BKG), Germany IGN Belgium IGN France Statens Kartverk, Norway Lantmäteriet, Sweden Kort & Matrikelstyrelsen,Denmark National Land Survey of Finland Bundesamt für Eich- und Vermessungswesen (BEV), Austria National Agency for Cadastre and Real Estate Publicity, Romania Institute of Geodesy, Cartography and Remote Sensing, Hungary
LoadUI
Results download service ID Description Error frequency CR.D-1 GetCapabilities mandatory parameters 7 % CR.D-5 Get Spatial Objects mandatory parameters 13 % CR.D-6 Get Spatial Objects optional parameters 53 % CR.D-11 Describe Spatial Object Type, mandatory 0 % parameters CR.D-12 Describe Spatial Object Type, optional parameters 0 %
The quality of data and services are essential key issues for further development of (investment in) a NSDI Data quality New business models and data processing streams requires new quality assurance routines Design of QA routines extremely important (risk minimization, parameters, acceptance thresholds) Service quality Summary INSPIRE network services ESDIN test suite Web applications Usability tests required
The role of Swedesurvey Partnership with local and international expertise Solving short term issues (implementation, development etc) Strategic guidance Capacity building
Swedesurvey Partnership model Swedesurvey Lantmäteriet Technical partners IT partners GIS & Remote Sensing partners Local partners
Thank You Questions? References Abugessaisa I, Östman A, 2011. Testing-SDI: E-government Prospective, Requirements, and Challenges. International Journal of Public Information Systems, Vol. 2011:1, pp. 11-47. http://www.ijpis.net/issues/no1_2011/ijpis_no1_2011_p2.pdf Östman A, Abugessaisa I, Tanzilli S, He X, El-Mekawy M, 2009. GeoTest: A Testing Environment for Swedish Geodata. Paper presented at the GSDI 11 World Conference, Rotterdam, June 15-19, 2009. http://www.gsdi.org/gsdi11/papers/pdf/234.pdf He X, Persson H, Östman A, 2011. Geoportal Usability Evaluations. http://inspire.jrc.ec.europa.eu/events/conferences/inspire_2011/presentations/61.pdf Portele C, Östman A, Koutroumpas M, He, Kovanen J, Schneider M Skopeliti A, 2011. Testing - an essential aspect of establishing an SDI. Paper presented at the INSPIRE Conference 2011 in Edinburgh, June 27 July 1, 2011. http://inspire.jrc.ec.europa.eu/events/conferences/inspire_2011/presentations/125.pdf Anders Rydén, 2011. Evaluating the Progress of the Swedish Spatial Data Infrastructure. Paper presented at the INSPIRE Conference 2011 in Edinburgh, June 27 July 1, 2011. http://inspire.jrc.ec.europa.eu/events/conferences/inspire_2011/presentations/47.pdf