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Management of history of the rotationof agricultural parcels through open-source tools
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, TranBa Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell
Bertet2
1- Laboratoire Littoral, Environnement et Societes (LIENSs), U.M.R CNRS 72662- Laboratoire Informatique Image et Interaction (L3I), Universite de la Rochelle
3- Centre d’Etudes Biologiques de Chize (CEBC), U.M.R CNRS 7372
11 June 2014
Third Open Source Geospatial Research & Education Symposium
Espoo, Finland, 10-13 June 2014
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 1 / 19
Content
An example of people using open-source solution
1 A long-term observatory for crop rotations and biodiversity at Chize(France)
2 Some unavoidable changes for the ancient GIS
3 Migration towards an open-source GIS solution
4 Conclusion and perspectives
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 2 / 19
A long-term observatory for crop rotations and biodiversityat Chize (France)
Zone Atelier Plaine et Val de Sevre
500 km2 south of Niort, in a intensivecereal plain
19 000 agricultural parcels
Various databases:
Crop rotations dataBiodiversity data
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 3 / 19
A long-term observatory for crop rotations and biodiversityat Chize (France)
Crop rotations data: recording the shape and content of farmers’s fieldsfor 20 years
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 4 / 19
A long-term observatory for crop rotations and biodiversityat Chize (France)
Database ”Assolement”
Records: 255 000Cultures: 49 types (wheat, rapeseed, corn, alfafa, grass, ray grass, ...)
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 5 / 19
A long-term observatory for crop rotations and biodiversityat Chize (France)
”Fauna & Flora” database
Observations:25 000
Species: 160
Behavior
datetimelocalisation
Nests: 700
Structured data
Acquisition is made through Web formula with records into a PostgreSQLdatabase
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 6 / 19
A long-term observatory for crop rotations and biodiversityat Chize (France)
Our concerns
Perennity of the information systemPerennity of acquisition system for crop rotationsEfficient support for spatio-temporal analysis [Howenstine, 1993]Integrating various other observation systems with it
Spatial-temporal data analysis
Building new ecological indicators by crossing easily biodiversity andcrop rotations dataPublishing data on the Web for every citizens
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 7 / 19
Some unavoidable changes for the ancient GIS
Data modelling : ”Space-Time Composite” [Langran, 1998]
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 8 / 19
Some unavoidable changes for the ancient GIS
Micro-parcels and parcel are linked by an association class supporting time
Figure: ”Space-Time Composite” used since 1994Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 9 / 19
Some unavoidable changes for the ancient GIS
The ancient system architecture : a mix of Access, ArcGIS, PostgreSQL,MapServer, shapefilesDevelopment cost : around 1 man/year, 2 years.
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 10 / 19
Some unavoidable changes for the ancient GIS
ARC GIS interface : a lot a stuff for manipulating geometries stored inACCESS (VBA programming)
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 11 / 19
Migration towards an open-source GIS solution
Migration toward PostgreSQL with QGIS as an interface for croprotations management
PostGIS: efficiency of spatial dimensionQGIS: open-source, QGIS Python API 1.8 is documentedEnhance consistency since geometries and attributes are administratedin the same interface, same software.
Fusion of databases: ”Assolement” and ”Faune & Flore”
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 12 / 19
Migration towards an open-source GIS solution
The new architecture : moving forward open data and Web access
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 13 / 19
Migration towards an open-source GIS solution
Database
Migration of Access toward Postgres/PostGIS : 1 week
Size: 400 Mb (bigest table: 400 000 records)
Standardization of spatial dimension: ’geometry’ attribut is integratedinside the database model
Management of user rights through database roles
Functions and tools around it
Quick to develop: Migration VBA toward Python : 3 months
Powerful: Grouping more than 43 use cases inside one unique pluginQGIS- harmonization of data processing, less prone to errors
Performances: get historic of land use for one parcel in less than 5 sagainst 2 min before
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 14 / 19
Migration towards an open-source GIS solution
Have a look on the QGIS plugin interface, named ”Assolement”
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 15 / 19
Migration towards an open-source GIS solution
Management of spatio-temporal data inside layered oriented GIS
1 PPP layer is a join between parcels (having attributes) andmicroparcels (having geometries) for one given date
2 PPP layer had to be used like a view because of problems withperformances
3 but a view can’t be updated from QGIS so we had to report changesinto database : dirty design
Project manager considerations
Code is under GPL v3, in university SVNhttps://svn.univ-lr.fr/project/SIG_ZONE_ATELIER
Nevertheless it is not reusable for someone else unless he/she reuses thesame database model.Making this reusable would require a considerable effort(mediator/adaptator approachs) that we can not afford by ourselves, sincewe have not enough human ressource.
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 16 / 19
Conclusion et perspectives
Conclusion: very usefull for ecologists
Analysis performances: OK
Fusion of databases inside one SGBD: good for facilitating thecross-analysis of data and for opening data to a larger audience
Management of user rights: secure the access to data
Perspective: a work that prepare deeper collaborations
Further research and development of the GISresearch: Integrate by dynamic mapping new data sources of theobservatory instead of a full migrationdevelopment: WebGIS showing aggregated data (Geoserver +OpenLayers.js/d3.js)
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 17 / 19
References
E. Howenstine
Measuring Demographic Change: The Split Tract Problem
The Professional Geographer vol. 45, no. 4, pp. 425–430, 1993.
G. E. Langran and N. R. Chrisman
A Framework for Temporal Geographic Information
Cartographica: The International Journal for Geographic Information andGeovisualization vol. 25, no. 3, pp. 1–14, 1998.
G. D. Mondo, J. G. Stell, C. Claramunt, and R. Thibaud
A Graph Model for Spatio-temporal Evolution
Journal of Universal Computer Science vol. 16, no. 11, pp. 1452–1477, 2010.
C. Plumejeaud, H. Mathian, J. Gensel, and C. Grasland
Spatio-temporal analysis of territorial changes from a multi-scale perspective
International Journal of Geographical Information Systems vol. 25, no. 11, pp.1597–1612, Nov. 2011.
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 18 / 19
Thank you for your attention
Christine Plumejeaud1, Bruno Lescalier2, Vincent Bretagnolle3, Tran Ba Huy2, Alain Bouju2, Nathalie Long1, Michel Menard2, Karell Bertet2 (Universite de la Rochelle)Management of history of the rotation of agricultural parcels through open-source tools11 June 2014 19 / 19