The image is of an earth flag.  It has an overall dimensional ratio of width: three, and length: five.  It consists of a field of blue (web color #0000CC definitive, PMS 072 C suggested), in the center of which is a quartered circle (sun-cross or wheel-cross) as the flag's charge rendered in thick white lines (web color #FFFFFF).  The quartered circle is the traditional astronomical and astrological symbol for the Earth.  The outer diameter of the charge is 2/5 of the flag’s total length.  The thickness of the lines of the charge is 1/8 of its outer diameter. (See construction sheet.)
Own work
Philip Kanellopoulos (User:Pipcallas = User:Pkanella), https://www.peristanom.org/