is related to interoperability and conflation models in geospatial analysis and integrated modelling applications, particularly in the context of spatial data infrastructures such as GEOSS. This translates to a focus on geocomputational statistics and data mining including geospatial patterns, outbreak detection, but also on geoworkflow modelling and partcularly to data quality and uncertainty propagation principles in relation to geoworkflows connected to/using web services. Didier's research centres on environmental agro-ecological geospatial models, and public health and spatial epidemiology applications.
in Geocomputational Data Association and Conflation
Geospatial Integrated Modelling:
The colourful summary presented above encompass for example the Integrated Modelling endeavour of many researchers: workflow example below in environmental modelling. Integrated Modelling fits into the theme of Geospatial Data Association and Fusion . Data and models are becoming more and more easily available within the growing interoperable world of internet with focused repositories such as the GEOSS (geoportal) Combining by few clicks and drops all these resources from data and geoprocessing services may lead to uncontrolled outcomes.
This work involves development of methods, measures, standards to derive meta-information of the quality and sensitivity of such workflows. Such methodology may be used to assist day to day researchers and analysts, in building model applications using geospatial information from different sources, at different scales, geoprocessed locally or remotely with various user objectives.
This research is particularly original in addressing the problem of adaptive modelling, when, due to change of context, e.g. new data or model becoming available, precision needed (change of scale), the workflow is dynamically modified in a semi-automated way. Towards this research, I participate in the FP7 project EuroGEOSS: 'European approach to GEOSS', contributing to multiscale and integrated modelling quality of a GEOSS model workflow.
Geocomputational statistics and data mining:
Looking now, more the complexity of systems with multivariate observations in a spatio-temporal domain, sometimes as part of an integrated modelling analysis, one needs to understand "correlations" in various ways, at various levels. This part of Geospatial Intelligibility (different ut linked to geospatial intelligence) has much to do with data mining, with concerns about clustering methods, pattern analysis, geostatistics analysis, multiscale correlations, etc ...
Findings with these methods have also some consequences in relation to conflation ("bigger than the sum of its parts"), that is the need of methodologies when either assimilating new datasets in an existing model, or when transposing some information at a a different scale level: changing scale, extrapolations, forecasts. Using multiway statistical methodologies such Principal Tensor Analysis of k-way arrays (see the R add-on package, PTAk ), can be an approach to study some spatio-temporal clustering, multiscale patterns, and spatial co-occurrences at higher orders of marked processes.
This can be applied in various domain such as ecology, biogeography, health statistics and spatial epidemiology, where simple modelling and integrated modelling implies the consideration of spatial interaction/association in various aspects. An R add-on package called kOO is underway... Some combination of geospatial geometrical transformations together with attibute spatial analysis can make use fo this framework within the context of generalisation and map schematisation or optimal zoning systems.
in Geoinformatics, Standards & Data Modelling
Interoperability & GeoWorkflows:
the Integrated Modelling research about controlling workflows fits also in the Geoinformatics & Data Modelling theme. As already mentioned interoperability of data and models allows to build systems which can uses, requests, triggers itself in relation to events (sensors, web 2.0, semantic requests, etc ...).
Research on assessing and controlling model workflows is particularly original in addressing the problem of adaptive modelling, when, due to change of context, e.g. new data or model becoming available, precision needed (change of scale), the worklow is dynamically modified in a semi-automated way. In this domain current effort is related to data and meta data/process modelling for workflows and semantic enrichment of workflows in the spirit of semantically driven GIS architectures. This makes use of various XML modelling such as MOML or BPEL, after modelling via SysML and also the BPMN workflow graphical description (which now 2.0 has its own XML, see also the XPDL encoding) .
Data Integration, Data Fusion & Data Conflation:
In collaboration with my former colleagues at the Nottingham Geospatial Institute, an active member of the OGC contributing to various projects at European level linked to FP7, INSPIRE for example. Developing standards and/or contributing to data specifications has some links with the above research. Analysing their pertinence, and performance within implemented architectures for end users is also very much of interests when designing or establishing new uses of existing technologies, and geospatial methods for real case studies.Fusion and Conflation play finer roles, going deeper in the data integration, closer to the the geocomputational use of a collection of semantically related data for a particular application or model represented in a geoworkflow.
Leibovici, DG. Claramunt, C. Le Guyader, D. and Brosset, D. (2014) Local and global spatio-temporal entropy indices based on distance-ratios and co-occurrences distributions. International journal of Geographical Information (accepted 26 Nov 2013, available online).
Leibovici, DG. Birkin, MH (2013) Simple, multiple and multiway correspondence analysis applied to spatial census-based population microsimulation studies using R. NCRM Working Paper. NCRM-n°07/13, Id-3178
Leibovici, DG and Stock K (2013) "Away from data storage complexity, closer to geocomputational data mash-up". COSIT Workshop "Spatio-temporal theories and research for environmental, urban and social sciences: where do we stand?", Panel Discussion ("Needs and Perspectives for Spatio-Temporal Theories"), 2nd of September 2013, Scarborough, UK. (COSIT 2013)
Stock, K and Leibovici, DG (2013) Discovering Order in Chaos by Deriving Spatio-Temporal Data on the Fly. COSIT Workshop "Spatio-temporal theories and research for environmental, urban and social sciences: where do we stand?" 2nd of September 2013, Scarborough, UK. (COSIT 2013)
Leibovici, DG. Daras, K. (2013) When the k-spatial entropy is fast and faster using a zoning system. GISRUK 2013 Liverpool, 3-5th of April 2013 (withdrawn ... clash with Easter Holidays! )
Leibovici, DG. Pourabdollah A. and Jackson, MJ. (2013) Which Spatial Data Quality can be meta-propagated? Journal of Spatial Sciences, 58(1): 3-14
Leibovici, DG Pourabdollah, A and Jackson, M (2012) On Interoperability and Web Processing Service setting for Geo- Workflow Quality Assessment and Execution OSGIS 2012, Nottingham, U.K. September 2012
Du, H. Anand, S. Alechina, N. Morley, J. Hart, G. Leibovici, DG. Jackson, MJ. and Ware, J.M. (2012) Geospatial In formation Integration for Authoritative and Crowd Sourced Road Vector Data. Transactions in GIS, 16(4): 455-476
Pourabdollah A. Leibovici, D.G. Simms, D.M. Tempel, P. Hallett, S.H. and Jackson M.J. (2012) " Towards a Standard for Soil and Terrain Data Exchange: SoTerML." Computers & Geosciences,45: 270-283 (see also OGC/gml profile application)
Leibovici, D.G. Pourabdollah A. and Jackson M.(2011) " Which Spatial Quality can be Meta-Propagated?" ISSDQ 2011, International Symposium on Spatial Data Quality, 2011, 12-14 October 2011 Portugal
Leibovici, D.G. Swan, J. Anand, S. and Jackson M.(2011) " Coupling Outbreak Detection of Spatially Clustered Associations and Data Reduction" STDM-11 (Spatio-Temporal Data Mining), London 18-19 July 2011
Leibovici, D.G. Pourabdollah A. and Jackson M.(2011) " Meta-propagation of Uncertainties for Scientific Workflow Management in Interoperable Spatial Data Infrastructures" EGU 2011, European Geosciences Union, General Assembly, Vienna, Austria April 2011
Leibovici, D.G. Bastin, L. Anand, S. Hobona, G. and Jackson, M (2011) " Spatially Clustered Associations in Health related geospatial data". Transactions in GIS, 15(3): 347-364 (June-July 2011)
Leibovici, D.G. and Jackson, M. (2011) " Multi-scale Integration for Spatio-Temporal Ecoregioning Delineation." International Journal of Image and Data Fusion, 2(2): 105-119
Leibovici DG, . Bastin L,. and Jackson M. (2011) " Higher-Order Co-occurrences for Exploratory Point Pattern Analysis and Decision Tree Clustering on Spatial Data." Computers & Geosciences: 37(3): 382-389
Leibovici, D.G. Anand, S. and Jackson, M.(2010) " Open Source and Open Standards in Health Mapping." BCS: Open Source Health Informatics conference, 27th October 2010 London, UK
Leibovici, D.G. Pourabdollah A. (2010) " Workflow Uncertainty using a Metamodel Framework and Metadata for Data and Processes" OGC TC/PC Meetings, 20-24 September 2010, Toulouse, France.
Leibovici, D.G. (2010) " Spatio-temporal Multiway Decomposition using Principal Tensor Analysis on k-modes: the R package PTAk." Journal of Statistical Software, 34(10), 1-34
Leibovici, D.G. Foody G.M. and Boyd, D. (2010) " Spatial entropy for the measurement of the spatial accuracy of classified remote sensing imagery at multiple scales". Accuracy, July 2010, Leicester, UK
Leibovici, D.G. Bastin, L. Anand, S. Swan, J. Hobona, G. and Jackson, M (2010) " Spatially Clustered Associations in Health GIS "mashups"". 18th Annual Conference GISRUK, April 2010. University College London, London, UK (best Spatial Analysis paper) (ppt)
Leibovici, D.G. Anand, S. Swan, J. Goulding, J. Hobona, G. Bastin, L. Pawlowicz, S. Jackson, M. and James, R. (2010) " Workflow issues for Health mapping "mashups" of OGC."". University of Nottingham, CGS Technical report, 2010DL1, 6 pp
Hobona, G., Jackson, M., Anand, S., de Zorzi, S., and Leibovici, D. (2009) " Rule Specification for Semantically-oriented Harmonisation of European Datasets". In: Proceedings of the 2009 General Assembly of the European Geosciences Union(EGU), Geophysical Research Abstracts, Vol. 11, EGU2009-10589, Vienna, Austria, 19 -24 April 2009.
Hobona, G. Jackson, M. Anand, S. de Zorzi, S. and Leibovici, D. (2009) " Modelling rules for integrating heterogeneous geographic datasets". In: Proceedings of the 17th GISRUK conference, Durham, United Kingdom.
Leibovici, D.G. Swan, J. Anand, S , Goulding, J. Hobona, G Jackson, M.and James, R. (2009) " Geospatial mashups for health and epidemic mapping using OGC standards". IRDN Workshop"The use of Mapping sofware and systems in Health and academic research", Royal Geographical Society, London, UK, November the 4th, 2009.
Leibovici, D.G. (2009) " Defining Spatial Entropy from Multivariate Distributions of Co-Occurrences." COSIT'09 Conference On Spatial Information Theory, Aber Wrac'h, France, September 21-25, 2009,LNCS: Volume 5756/2009, 392-404
Leibovici, D.G. Hobona, G. Stock, K. and Jackson, M. (2009) " Qualifying geospatial workflow models for adaptive controlled validity and accuracy." In: IEEE, 17th International Conference on GeoInformatics, 2009, Fairfax USA, August 12-14, pp. 1-5
Leibovici, D.G. Bastin, L. and Jackson, M. (2009) " Higher Order Cooccurrences in Point Pattern Analysis and Decision Tree Clustering." StatGIS 2009, Milos Greece, June 17-19
Leibovici, D.G. Swan, J. Anand, S and Jackson, M.(2009) " A Spatial Structuration Heuristic for Integrated Automated Map Generalisation with Attribute and Geometry". GISRUK 2009, Durham, UK, April 1-3, 2009. (4p abstract) (poster)
Swan, J., Anand, S., Hobona, G., Leibovici, D.G., and Jackson, M. (2009) Opensource research framework a case study."OSGISUK09, Nottingham UK.
Leibovici, D.G. Swan, J. Anand, S and Jackson, M.(2008) " Combining Attribute and Geometry for Automated Generalisation and Schematisation". AutoCarto 2008, Shepherdstown, West Virginia, USA September 8-11, 2008
Leibovici, D.G. and Jackson, M (2008) " Multiscale Integration for Spatio-Temporal Ecoclimatic Ecoregioning Delineation." IGARSS Conference 2008, Boston, USA, 6-11 July
Landais, E Leibovici, D.G Martin-Prevel, Y Becquey, E Williams, R Tllili, F Holdsworth, M (2008) " Knowledge towards the role of fruit and vegetables in protecting against Non-Communicable Disease among women from Burkina Faso, Senegal, Tunisia and the UK." Fruit and Vegetable Summit, May 27th - May 30th 2008, Paris.
Leibovici, D.G. Bastin, L. and Jackson, M. (2008) " Discovering Spatially Multiway Collocations." GISRUK Conference 2008, Manchester, UK, 2-4 April, 2008
Leibovici, D.G. (2007) " A Multiscale Spatio-Temporal Ecoclimatic Ecoregioning Pattern Analysis". StatGIS Conference 2007, Klagenfurt, Austria. 24-26 september
Loireau.M, Sghaier,M. Mondher, F. Ba, M. Abdelrazik, M. d'Herbès, J-M. Desconnets, J-C. Leibovici, D. Debard, S. Delaître, E. (2007)" )"Local Environmental Information System to assess the risk of desertification: circumSaharan compared situations (Roselt network)". Sécheresse,18(4): 328-35
Leibovici, D.G. Quillevere, G. and Desconnets, J-C. (2007) " A Method to Classify Ecoclimatic Arid and Semi-Arid Zones in Circum-Saharan Africa Using Monthly Dynamics of Multiple Indicators". IEEE Transactions on Geoscience and Remote Sensing, 45(12), 4000-4007.
Leibovici, D.G. Quillevere,G. and Desconnets, J-C. (2007) " Extracting Dynamics of Multiple Indicators for Spatial recognition of Ecoclimatic zones in Circum-Saharan Africa". Proceedings of 15th Annual GISRUK Conference, Maynooth, Ireland. 11 - 13 April, 2007.
Loireau, M. D'Herbès, J.M. Leibovici, D. Desconnets, J.C. and Granouillac, B. (2006) " An ICS for desertification monitoring in Africa Circum-Saharian zone: focus on one of its components, the SIEL-ROSELT". In Seminar Proceedings: Role of Information Circulation Systems in scientific and practical approaches to combat desertification / AIDCCD. Windhoek and Ondangwa, Namibia, 2-7 April 2006: pp 81-92.
Loireau, M. Leibovici, D. Desconnets, J-C. and D'Herbès J-M. (2005) " LEIS, a Tool for Diagnosis and Prevision of Antropogene Pressure on Natural Vegetation". RGLDD (Remote Sensing and Geoinformation Processing in the Assessment and Monitoring of Land Degradation and Desertificationt) 2005, Trier (Germany).If you want to collaborate either by having a really interesting use case, challenging or demonstrating this research, or by suggesting complementary aspects, do not hesitate, please contact me. Dr. Didier G. Leibovici.
Dr Didier G. Leibovici:
• Contact Me
• full CV
• my LinkedIn
• R PTAk and other stuff
• "politique de comptoir"
• some geolocated photos
• some other photos
My Research Areas:
• Geocomputational Statistics
• GIS, WebGIS, VGI
• Workflow modelling
• Open Data Open Standard
• Geospatial Analysis
• Spatial Data Quality
Recent and past Projects:
• geoHealth (Geoconnexion report)
• The e-soter Platform
• GIGAS Interoperability