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CASE STUDIES : |
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Office National Interprofessionnel des Céréales
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Diadeis Mission
Within the scope of the Common Agricultural Policy, Office National Interprofessionnel des Céréales controls the payment of compensatory aids to cereal producers.
Acting on behalf of Community Authorities, ONIC has the job of carrying out the necessary verifications to ensure farmers' declarations are compliant and that the aid money paid is completely regular.
ONIC has implemented a geographical information system to electronically verify the acreage declarations of French farmers. DIADEIS's mission involves first scanning and georeferencing cadastral divisions on the IGN aerial orthophotograph then scanning and redrawing the agricultural acreage declarations sent in by farmers on paper forms.
The first thing ONIC needed was a grid of the georeferenced sections in order to position the farmed land with respect to the orthophotograph. By 2003 it needed to be able to produce graphic acreage declaration forms (BDORTHO® extracts) to send out to farmers. DIADEIS therefore produced initialisation data for the ONIC Graphic Plot Register / National Graphical Information System. This models all the farming plots affected by the CAP's measures across the whole of the country and produces georeferenced surface objects.
The second step involved digitising the landholding boundaries and adjusting them by photo-interpretation. This was done using A3 sheets (extracts from 1:10,000 scale BDORTHO® Agri orthophotographs) on which farmers had traced out the boundaries of their landholdings in red.
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Process
Scanning RPG graphic entry forms and tables: multi-sheet files comprising orthophotography extracts centered on farming land
Georeferencing of the scanned sheets on a Lambert grid and scans on orthophotomap and IGN Scan 25
Vector entry of plot contours and numbers, cadastral divisions and subdivisions
Adjustment after interpreting limits according to CAP rules by reconciliation with orthophotographs
Assembly on the scale of geographical departments
Delivery in the form of topological coverage in ESRI Shape format
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Technology
Georeferencing of cadastral divisions: datum and geometrical adjustment of the scanned images of cadastral divisions on orthophotographs using GTAdjust software from Geotexel.
Scanning of farmers' declarations:
- Automatic georeferencing of scanned sheets by optical recognition (DIADEIS GeOCR technology)
- Setting up of a geographical adjustment model with Delaunay triangulation by grid analysis
- Batch mode raster rectification of massive volumes (3,500 sheets/day) using this model
- Analysis and processing of images to formalise the coloured outlines
- Entry of landholding boundaries using cadastral drawing technology developed by DIADEIS
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Human resources
Paperwork elimination team of 10 people for the scan (scanning, checking, filing) and 120 to 200 people for data entry.
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Volume
385,000 declarations scanned and 1,750,000 plots entered.
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Main challenge
The challenge was twofold:
technological: being able to handle the georeferencing of hundreds of thousands of declarations
organisational: completing the scanning of all these declarations in only 3 months (during the summer)
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Input
RPG graphic forms.
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Output
Data in the form of topographical coverage in ESRI format (georeferenced, vectorised, assembled sheets).
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Result
DIADEIS has helped ONIC establish the data required for its geographical information system. Once assembled, this data enables farmers to directly declare their acreages on a map for the very first time. DIADEIS's industrial organisation has enabled it to process this whole host of new acreage declarations within the allotted time so that ONIC can pay farmers their grants on time.
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