关键词: 干旱区, 强对流, 天气雷达, 图像, 纹理特征

Abstract: Based on the volume scan data of Yinchuan New Generation Weather Radar about severe convective precipitation in 2004—2005, the composite reflectivity images in polar coordinates were transformed into ones in plane-right angle coordinates. With the gray level co-occurrence matrix, the distribution of texture parameters, such as angle second moment, contrast, correlation, entropy and inverse difference moment, etc were obtained. Results showed that there are obvious differences of texture between the remote sense images of precipitation in Ningxia and that in south China. In the radar images of severe convective precipitation in arid region, north-mid part of Ningxia, the texture is not as distinct as that in south China, and the definition is not very clear, the texture is weaker and thinner, the images are smoother and stable than that of south China, the features indicate that the clouds of severe convective precipitation in the arid region are more homogeneous.

Key words: arid area, severe convection, weather radar, image, texture analysis