it's not pixelated, it's exactly how a realistic landscape would look like with tiny gaps and protuberances and stuff. basically most of the land contours found in nature are made of wiggly lines. nature doesn't have straight lines.
here's a satellite photo:
“In the beginning God said, the four-dimensional divergence of an antisymmetric, second rank tensor equals zero, and there was light, and it was good. And on the seventh day he rested.”- Michio Kaku