Detection and correction of suspicious pixels of rainy images for Setif weather radar, Northeast of Algeria

摘要

In order to ensure a good coverage of rainfall information in the Algerian territory, the Algerian Office of Meteorology has installed seven meteorological stations, including the weather radar of Sétif, Northeast of Algeria. This technology ensures continuous rainfall cover in the area of this particular town of Sétif and its neighbouring towns. However, this tool proves to be difficult to use, especially in a relief zone, as it presents some errors which can reduce the quality of estimation. The purpose of this study is the calibration of Sétif weather radar, then the detection and correction of suspicious pixels for three crowns (0 km-50 km, 50 km-100 km, and 100 km-150 km) using the pixel-info program, the efficiency of the latter has been studied for three crowns. The result showed that the pixel-info program gave a good estimate for the 0 km-50 km zone and the reverse for the other two rings. The program gives a high error rate because of the attenuation of the radar signal meteorological.