The ability to automatically keep the grid lines visible over an area plot in polar coordinates is not available in MATLAB. To work around this issue, you can change the "EraseMode" property of the grid lines to "xor", as follows:
aThe project retains its primary road network, determined by a main grid consisting of three horizontal axes (east-west), each 60 metres wide, and an equally wide vertical axis (north-south) that passes through the central area of the plot. 项目保留它的主要公路网,取决于包括三个水平的轴(...