New Technology for a New Century
A GIS SOLUTION TO LAND CONSOLIDATION TECHNICAL PROBLEMS IN MOROCCO
El Hassane SEMLALI, Morocco
Key words: land consolidation, reallocation, conceptual data model, CONGOO, database, GIS, parcel, soil classes, precision.
In Morocco, among important agricultural projects, land consolidation constitutes a dynamic mean for the development of the rural world. Unfortunately, land consolidation projects do have a great number of administrative and technical problems.
Our objective in this study is to show the contribution of GIS to find a solution to these technical problems. This solution concerns especially land consolidation in irrigated areas, it is based on five main key points:
Then a database is built based on the georelational model of ArcInfo. The spatial information identified in the conceptual level is assigned the corresponding entities in ArcInfo representation. Entities are classified as function of their geometric representation, such as point, line and polygon.
After that, we suggest a methodology to solve computational, overlying and reallocation problems, this methodology tries to find solutions to imposed constraints such that:
The outline of the proposed methodology is subdivided into three parts:
The proposed methodology was conducted to three applications. The results show that the graphical redistribution is more time consuming than the computed redistribution, all constraints are satisfied, most of the properties are redistributed near their old positions, most landowners receive equivalent percentage of soil classes, and the redistributed values do meet the allowed tolerance.
This study terminates with the estimation of the precision of overlay operations in land consolidation projects. Results of overlying parcels to soil classes are influenced by three main factors: the coordinates of soil class limits, shape of parcels and intersection angles. The precision of the attributed areas is very influenced by that of soil class limits.
El Hassane Semlali
24 March 2001
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