What the image shows
A digitally rendered image of Earth seen from above at an angle, with stars in the black space at the edges. Greenland is drawn as one giant airbase: the island's surface is replaced by a gray tarmac with a long central runway, taxiways, hangars and several parked military cargo and transport aircraft along the left side. A large American flag flies from a pole on a pale square pad on the island's eastern side. Iceland is visible to the right of Greenland, and Canada's snowy Arctic islands and northeastern North America are on the left. Parts of Europe and the British Isles appear at the right and lower right. White block capitals along the bottom read the caption. The image looks like a composite or CGI render, not a photograph. It asserts or jokes that Greenland is, or should be, a US military territory.
Text in image: WELCOME TO GREENLAND
Described automatically. The words above are a machine's reading of the picture, not Trump's.