Process and device for evaluating the precipitations over an area of terrain
First Claim
1. A process for evaluating precipitation over an area of terrain, comprising the steps of:
- deploying automatic rain gauges within the area of terrain;
synchronizing the rain gauges;
providing, via the rain gauges, dated local rainfall data accumulated over a first chosen time intervalsampling pixels of radar images over a plurality of reflectivity levels to obtain meteorological radar data with given radar periodicity, the radar images representing rain-bearing cells over a radar workspace which encompasses the area of terrain;
analyzing a succession of radar images within the area of terrain to track main rain-bearing cells dynamically by their shape and motion;
compiling a radar rainfall measurement chart by accumulating, for each pixel of the area of terrain, precipitations during a second chosen time interval which are due to the main rain-bearing cells by interpolating the shapes and positions of the main rain-bearing cells during the second time interval,selecting from the deployed automatic rain gauges at least one sub-array of at least four rain gauges which are separated from one another by about 2 to 4 kilometers and are affected by at least one main rain-bearing cell; and
correcting a rainfall measurement chart as a function of a relationship between the rainfall data provided by the rain gauges of the selected at least one sub-array and rainfall data from the rainfall measurement chart taking into account a ratio between the first and second chosen time intervals
1 Assignment
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Accused Products
Abstract
Automatic rain gauges (P00-P0n) are employed within the area of terrain (ZT). A meteorological radar (R1) provides, with a given radar periodicity, a radar image representing rain-bearing cells of concern to the area of terrain. By analyzing the succession of radar images, the main rain-bearing cells are tracked dynamically by their shape and motion. Then a radar rainfall measurement chart is compiled by accumulating, in each pixel of the area of terrain, the precipitations due, during a second chosen time interval, to these main rain-bearing cells, with interpolation of their shapes and positions. At least one sub-array (PA, PB) of four rain gauges separated from one another by about 2 to 4 kilometers and affected by at least one main rain-bearing cell is selected. Finally, the rainfall measurement chart is corrected at least partially as a function of the relation between the accumulated true rainfall data and those from the said chart at the locations of the rain gauges of the sub-array. This allows excellent estimation of the precipitations in each square kilometer of the area of terrain.
43 Citations
10 Claims
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1. A process for evaluating precipitation over an area of terrain, comprising the steps of:
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deploying automatic rain gauges within the area of terrain; synchronizing the rain gauges; providing, via the rain gauges, dated local rainfall data accumulated over a first chosen time interval sampling pixels of radar images over a plurality of reflectivity levels to obtain meteorological radar data with given radar periodicity, the radar images representing rain-bearing cells over a radar workspace which encompasses the area of terrain;
analyzing a succession of radar images within the area of terrain to track main rain-bearing cells dynamically by their shape and motion;compiling a radar rainfall measurement chart by accumulating, for each pixel of the area of terrain, precipitations during a second chosen time interval which are due to the main rain-bearing cells by interpolating the shapes and positions of the main rain-bearing cells during the second time interval, selecting from the deployed automatic rain gauges at least one sub-array of at least four rain gauges which are separated from one another by about 2 to 4 kilometers and are affected by at least one main rain-bearing cell; and correcting a rainfall measurement chart as a function of a relationship between the rainfall data provided by the rain gauges of the selected at least one sub-array and rainfall data from the rainfall measurement chart taking into account a ratio between the first and second chosen time intervals - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification