Border tourism plays an important and positive role in international economic and cultural cooperation. and the tourism cooperation relationship between China and North Korea has lasted for more than 30 years. China has become the country with the largest number of tourists to North Korea. However. https://akmfobmkoqh9g.theisblog.com/35130144/vision-based-autonomous-landing-of-a-quadrotor-on-the-perturbed-deck-of-an-unmanned-surface-vehicle