What does Yu Guangzhong mean by gluttony in his poems?

I think the "gluttonous map" actually refers to this place. When I die, the map of China here is vast, and gluttony refers to Xiang Tao as magnificent as the sky.

The article also points out that Yu Guangzhong loves his motherland and hopes to return to his mother's arms.

This kind of mood is beyond the comprehension of ordinary people. He is abroad, but his heart is connected with his motherland. This spirit is also what we should learn.

The above views are purely my own understanding. Please correct any mistakes.