Abstract: Pixel distortion re flects a change of the area and shape of the pixel observed by a geostationary imager with the location of the earth. The ability of detecting convective-scale weather phenomenon is determined by the pixel distortion, the location of the sub-satellite point and the pixel size at the sub-satellite point. If a geostationary meteorological satellite is positioned at 105°E with a 2-km sub-satellite resolution, its convective-scale-appropriate observing domain may cover almost the entire China.