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Article Dans Une Revue The Cartographic Journal Année : 2015

Symbolization and Generalization to Map Water Pipe Data Flow and Water Quality at Different Scales

Ha Pham
  • Fonction : Auteur

Résumé

Mapping drinking water flow is a real challenge not only to detect water leaks but also to control the quality of the water. In France, 900,000 km of water pipe serves 99% of the population. A recent law imposes the mapping of these pipelines on a known geographical system with a planar positional accuracy from 0.4 to 1.5 m according to the age and type of the pipeline. Wireless sensors and models based on computational fluid mechanics (CFD) allow to study flow and to reconstruct parameters such as velocity, pressure and a chemical concentration at each point. This information can be used to detect leaks and to control the concentration of chlorine or other chemical products. However, this information is not easy to map on GIS due to the small width of water pipe and the very high quantity of points necessary for data flow computation. In this research work, we propose solutions to map this information at different levels of detail with other information such as roads and buildings. We first propose to use area symbols instead of punctual symbols to improve zoom-in visual effects. We also propose to generalize initial water data for zoom-out processes. We use the axis of the water pipe as basic geometry and we segment it. We then compute a generalized value of pressure, velocity or chemical concentration for each segment with specific function adapted to the property we wish to study. We propose a conceptual data schema that describes the required information to map this data at different levels of detail. The solution has been fully implemented on experimental data and illustrated by means of a dedicated web mapping that proposes a set of GIS functions such as the selection of the data, zooming functions but also the animation to see the propagation of a chemical product in the water pipe.
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Dates et versions

hal-03894559 , version 1 (12-12-2022)

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Citer

Anne Ruas, Ha Pham. Symbolization and Generalization to Map Water Pipe Data Flow and Water Quality at Different Scales. The Cartographic Journal, 2015, 52 (2), pp.149-158. ⟨10.1080/00087041.2015.1119465⟩. ⟨hal-03894559⟩

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