Technical question warning !
I'm trying to figure out the size of countries and continents but there is something I do not understand. The map I'm using was made with the equirectangular projection (its width is twice as large as its height). I converted the file with G projector into a mollweide projection (equal area) and now the image is an ellipse of 1660 by 830 pixels high. At the equator, each pixel represent 24 km. Each pixel theoretically represent an area of 24 by 24 km or 576 km2.
I used the magic wand in photoshop and it tells me that the map is 1,082,100 pixels (borders excluded). With each pixel representing 576 km2, the total is over 623,000,000 km2. The problem is that my map is supposed to be as big as Earth. Earth is 510,000,000 km2, so it's 22% larger for no reason.
- What I am doing wrong?
- Should I use the % of area covered and then convert it in square kilometers?
Here's the map,
I'm not allowed to post it directly here since it's not CC.