算法寻找地球上最长的视线

算法寻找地球上最长的视线
Show HN: Algorithmically Finding the Longest Line of Sight on Earth

研究人员利用一种名为CacheTVS的独特算法，发现了地球上最长的视线：从兴都库什山脉到皮克·丹科娃，长达惊人的530公里。这意味着，在理想条件下，理论上你可以看到这么远！虽然很难精确确定排名第二的视线，因为长距离视线往往集中在某些区域，但研究团队整理了一份突出地理多样性地点的列表。第二长的视线（504公里）从哥伦比亚的安提奥基亚延伸至皮科·克里斯托瓦尔，第三长的视线（483公里）从俄罗斯的厄尔布鲁士山延伸至土耳其的黑海山脉——考虑到这两个国家没有共同边界，这真是一个壮观的景象。该项目绘制了大约45亿条视线，并且一个允许探索的交互式地图可在map.alltheviews.world上找到。

汤姆和瑞安开发了一种算法，使用Rust和SIMD技术，来确定地球上最远的视线距离。他们的研究证实，吉尔吉斯斯坦的皮克·丹科娃和中国的兴都库什山脉之间，530公里是地球上最长的视线距离。该项目涉及大量的计算能力——数百个AMD Turin核心、大容量内存和磁盘空间，以及两天的运行时间——用于处理全球地形数据。一个交互式地图（[https://map.alltheviews.world](https://map.alltheviews.world)）允许用户通过点击地球上的任何一点来探索这些视线距离。关于算法和流程的详细技术解释，可以在他们的博客上找到（[https://tombh.co.uk/longest-line-of-sight](https://tombh.co.uk/longest-line-of-sight) & [https://ryan.berge.rs/posts/total-viewshed-algorithm](https://ryan.berge.rs/posts/total-viewshed-algorithm)）。另一个相关项目允许用户可视化从单个点观察到的被遮挡地形，但使用了AI生成的JavaScript。

All The Views

With the help of a custom-developed algorithm, CacheTVS, we have exhaustively checked every single view on Earth in search of the coveted longest line of sight on the planet. Based on the method we detail here, we present the greatest view of all:

Longest Line Of Site — The longest line of sight on the planet, at 530km, from the Hindu Kush to Pik Dankova

Runners Up

Longest lines of sight tend to group together around peaks and ridges. So the following are more of our own curated list rather than the technically correct runners up. We chose them based on being in notably different regions of the world.

Second Longest Line Of Site — The second longest line of sight, at 504km, from Antioquia to Pico Crostobal in Colombia

Now we go right to the other side of the world to Colombia in South America. We’ve found a line of sight from the department of Antioquia to Pico Cristobal, Colombia’s highest mountain.

Third Longest Line Of Site — The third longest line of sight, at 483km, from Mount Elbrus in Russia to the Pontic Mountains in Turkey

Our pick for the third greatest view is from Mount Elbrus in Russia to the Pontic Moutains in Turkey. Notably Russia does not share a land border with Turkey, so it’s interesting that you can still see one from the other.

Explore For Yourself

We have around 4.5 billion lines of sight for you to explore in an interactive map at map.alltheviews.world