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.
Rosser J, Jackson MJ, and Leibovici DG (2018) Full Meta Objects for Flexible Geoprocessing Workflows Transactions in GIS (accepted May 2018)
Leibovici DG, Williams J, Rosser JF, Hodges C, Chapman C, Higgins C, and Jackson MJ (2017) Earth Observation for Citizen Science validation, or, Citizen Science for Earth Observation validation? The Role of Quality Assurance of Volunteered Observations. Data, 2(4), 35 (special issue "Open Data and Robust & Reliable GIScience” http://www.mdpi.com/journal/data/special_issues/open_data)
Leibovici DG (2017) Towards VGI QAQC for LULC and the planned LandSense-QAwAT system. GEPW11, 20-22 June 2017, Helsinki, Fin.
Leibovici DG, Anand S, Santos R, Al-Azri M, Mayes S, Ray R, Baten A, King G, Karunaratne A.S, Azam-Ali S and Jackson M.J (2017) Geospatial binding for transdisciplinary research in crop science: the GRASP-GFS initiative (Geospatial Resource for Agricultural Species, pests and Pathogens with integrated workflow modelling to support Global Food Security). Open Geospatial Data, Software and Standards, 2:2
Gardner Z, Leibovici DG, Basiri A, and Foody G (2017) Trading-off location accuracy and service quality: privacy concerns and user profiles. in: IEEE proceedings of the International Conference on Location and GNSS, ICL-GNSS 2017 conference, 27-29 June 2017, Nottingham, UK.
Santos R and Leibovici DG (2017) On a Mantel-Test Extension for k Series of Distances and Related k-Way Multivariate Methods. 2017 International Conference on GeoComputation: Celebrating 21 Years of GeoComputation, 4th-7th September 2017, Leeds, UK
Leibovici DG, Rosser, JH, Hodges C, Evans B, Jackson MJ, and Higgins C (2017) On Data Quality Assurance and Conflation Entanglement in Crowdsourcing for Environmental Studies. ISPRS International Journal of Geo-Information, special issue on ‘Volunteered Geographical Information’, 6(3), 78
Rosser J, Leibovici DG, and Jackson MJ (2017) Rapid flood inundation mapping using social media, remote sensing and topographic data. Natural Hazards, 87.1 (2017): 103-120
Santos R, Huynh D, Anand S, Ray R, Mayes S, and Leibovici DG, (2016) A geoprocessing modelling interoperable framework for AgriGIS, using open data and open standardS. OGRS, (OpenSource geospatial Research Symposium) 12-14 October 2016, Perugia, Italy
Anand S, Santos R, Mayes S, and Leibovici DG (2016) GRASP-GFS, - A multidisciplinary vision of modelling and forecasting for sustainable agriculture. GODAN Research Symposium. 2016
Wood A, Brignell C, Gardner Z, Jackson M, John R, Wagner C, Leibovici DG, and Basiri A (2016) The Use of Spatial Uncertainty in the obfuscation of location data for the purpose of privacy protection. LBS2016, 13th conference on Location Based Services, 14-16 Nov 2016, Vienna, Austria
Rosser J, Pourabdolllah A, Brackin R, Jackson MJ, and Leibovici DG (2016) Full Meta Objects for Flexible Geoprocessing Workflows: profiling WPS, or BPMN? 19th AGILE, 14-17 June 2016, Helsinki, Finland.(BEST PAPER SESSION)
Leibovici DG, Rosser J, (2016) Multiway sensitivity analysis of the fusion of earth observation, topography and social media data for rapid flood mapping. Spatial Accuracy, 12th International Symposium, 5-8 July 2016, Montpellier, France
Leibovici DG, Williams J, Rosser JF, Hodges C, Scott D, Chapman C, Higgins CI, and Jackson MJ (2016) The COBWEB Quality Assurance System in Practice: Example for an Invasive Species Study. ECSA conference 19-21 May 2016, Berlin
Higgins CI, Williams J, Leibovici DG, Simonis I, Davis MJ, Muldoon C, and O´Grady M (2016) Citizen OBservatory WEB (COBWEB): A Generic Infrastructure Platform to Facilitate the Collection of Citizen Science data for Environmental Monitoring. IJSDIR, Vol.11, 20-48
Meek S, Jackson MJ, and Leibovici DG (2016) A BPMN solution for chaining OGC services to quality assure location-based crowdsourced data. Computers & Geosciences, 87: 76-83
Leibovici DG, Meek S, Rosser J, and Jackson MJ (2015) DQ in the citizen science project COBWEB: extending the standardS. Data Quality DWG,OGC/TC Nottingham, September 2015, U.K
Leibovici DG, and Birkin MH (2015) On Geocomputational Determinants of Entropic Variations for Urban Dynamic Studies. Geographical Analysis, 47 (3): 193-218
Leibovici DG, Evans, B. Hodges, C, Wiemann S, Meek S, Rosser J. and Jackson M (2015 )On Data Quality Assurance and Conflation Entanglement in Crowdsourcing for Environmental Studies. ISSDQ 2015 - The 9th International Symposium on Spatial Data Quality, 29-30 September, La Grande Motte, France
Leibovici DG, Brosset D, Claramunt C, and Jackson M (2015 ) k-Co-occurrences Density Map Estimation. Spatial Statistics Conference: Emerging Patterns, 9-12th of June 2015, Avignon, France, Procedia Environmental Sciences, 26: 105-109.
Wiemann S, Meek S, Leibovici DG, Jackson M, Chapman C, and Lars B (2015) Service-based combination of quality assurance and fusion processes for the validation of crowdsourced observations. AGILE 2015, June 2015, Lisboa, Portugal
Stock, K Leibovici DG, DeLazari, L and Santos, R (2015 ) Discovering Order in Chaos: Using a Heuristic Ontology to Derive Spatio-Temporal Sequences for Cadastral, Roads and Parks Data. Spatial Cognition & Computation, 15(2): 115-141
Hodges CJ, Leibovici DG, and Ties SF (2014) Building confidence in crowdsourced data for biological monitoring and policy making as part of FP7 Project COBWEB. GIScience 2014, Eight International Conference on Geographical Information Science, Vienna 23-26 September
Huynh Chi D, Vu T, Jackson MJ, Leibovici DG, and Mayes S, (2014) Towards a User-Centric Approach for Assessing Quality of Crowd-Sourced Data, an Application in Agriculture. Role of Volunteered Geographic Information in Advancing Science: Effective Utilization: Workshop GIScience 2014, Eight International Conference on Geographical Information Science, Vienna 23-26 Septembe
Leibovici DG, Daras K, and Turner AGD (2014) Competing Spatial Optimisation using the k-spatial entropy. GIScience 2014, Eight International Conference on Geographical Information Science, Vienna 23-24 September
Leibovici DG, Meek S, Anand S, Santos R, Morley J, Jackson MJ, Al-Azri M, Mayes S, Ray R, Hodgman C, Baten A, King G, Brailsford T, Vu T, Karunaratne AS, Azman R, Walker S, and Azam-Ali S (2014) The GRASP initiative, Geospatial Resource for Agricultural Species, pests and Pathogens with integrated workflow modelling to support Global Food Security. In: AgriGIS, workshop, ´Open Source and Open Data in Crop Modelling and Related Agriculture Issues, OSGIS, 2014, 2-3 September 2014, Nottingham, UK
Jackson MJ, Meek S, and Leibovici DG (2014) NSDI data enhancement through crowdsourcing: the role of quality assurance to ensure effective conflation of authoritative and non-authoritative data sources. INSPIRE conference, Aalborg University, Denmark, 16th-20th June 2014
Meek S, Jackson M, and Leibovici DG (2014) ) A flexible framework for assessing the quality of crowdsourced data. AGILE conference, 3-6 June 2014, Castellon, Spain
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 Science, 28(5): 1061-1084
Samarasundera E, Hansell A, Anand S, Leibovici DG, Oppenheimer C, and Horwell C (2014) Geological Hazards: from Early Warnings Systems to Public Health Toollkits. Health & Place, 30: 116-119
Leibovici DG, and 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.
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.
Leibovici DG, and 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, and Birkin MH (2012) Entropic variations of urban dynamics at different spatio-temporal scales: geocomputational perspectives. NARSC-RSAI, November 2012, Ottawa, Canada
Leibovici DG, Pourabdollah A, and Jackson MJ (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 JM (2012) Geospatial In formation Integration for Authoritative and Crowd Sourced Road Vector Data. Transactions in GIS, 16(4): 455-476
Pourabdollah A. Leibovici DG, Simms DM, Tempel P, Hallett SH, and Jackson MJ (2012) " Towards a Standard for Soil and Terrain Data Exchange: SoTerMLComputers & Geosciences, 45: 270-283 (see also OGC/gml profile application)
Leibovici DG, Pourabdollah A, and Jackson MJ (2011) " Which Spatial Quality can be Meta-Propagated?" ISSDQ 2011, International Symposium on Spatial Data Quality, 2011, 12-14 October 2011 Portugal
Leibovici DG, 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 DG, Pourabdollah A, and Jackson MJ (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 DG, 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 DG, 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 DG, Anand S, and Jackson MJ (2010) " Open Source and Open Standards in Health Mapping." BCS: Open Source Health Informatics conference, 27th October 2010 London, UK
Leibovici DG, and 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 DG, (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 DG, Foody GM, and Boyd D (2010) " Spatial entropy for the measurement of the spatial accuracy of classified remote sensing imagery at multiple scales". Spatial Accuracy, July 2010, Leicester, UK
Leibovici DG, Bastin L, Anand S, Swan J, Hobona G, and Jackson MJ (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 DG, Anand S, Swan J, Goulding J, Hobona G, Bastin L, Pawlowicz S, Jackson MJ 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 DG (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 DG, 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 DG, (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 DG, 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 DG, 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 DG, 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 DG,, and Jackson M (2009) Opensource research framework a case study. OSGISUK09, Nottingham UK.
Leibovici DG, 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 DG, 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 DG, Bastin, L. and Jackson M (2008) " Discovering Spatially Multiway CollocationS," GISRUK Conference 2008, Manchester, UK, 2-4 April, 2008
Leibovici DG, (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 DG, 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 DG, 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 DG, 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 DG, 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
• OS, GIS, geoprocessing tools
Recent and past Projects:
• H2020 LandSense
• FP7 COBWEB
• BBSRC GRASP
• ESRC TALISMAN
• FP7 EuroGEOSS
• geoHealth (Geoconnexion report)
• FP7 The e-soter Platform
• FP7 GIS4EU
• FP7 GIGAS, Interoperability
• FP7 DeSurvey
• ROSELT/OSS, with IRD