AllTheViews

Learning and science

geospatial visibility analysis

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AllTheViews

Algorithmically finding the longest line of sight on Earth

alltheviews.world

#line of sight#viewshed#elevation data#longest view#terrain map

412points
181comments
#79of 4,366 in 2026
Top 2%of 2026 by points

How HN took it

CuriousMostly questions and neutral comments

22 positive, 46 neutral or asking, 1 mixed, 15 critical, out of 84 comments about the project. Thread score +0.20.

Execution: 1 for, 13 againstIdea: 11 for, 1 againstDesign: 2 for, 0 againstDocs: 0 for, 1 against

The thread, comment by comment

Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.

positive neutral or mixed critical about another commenter or something else the maker

What HN said

What people liked

  • Impressive full-planet computation effort

    From 1 comment
    • The jump from "we can compute this" to "we computed it for the entire planet" is what makes this impressive. A lot of projects stop at the proof of concept. Running hundreds of…
      BuleBule on HN
  • Clever and interesting project

    From 1 comment
    • This is so clever and interesting. Congratulations! But... I want to see a photo! Or at least what it looks like in Google Earth, with a red arrow marking the furthest point. It…
      crazygringo on HN

Objections

  • Atmospheric refraction not handled well for long lines

    From 2 comments
    • The jump from "we can compute this" to "we computed it for the entire planet" is what makes this impressive. A lot of projects stop at the proof of concept. Running hundreds of…
      BuleBule on HN
    • "Viewsheds" of any location can be calculated and matched with photographs using "GeoImageViewer", an application I wrote a couple of years ago. Any feature in the photo can be…
      hdersch on HN
  • Data resolution too coarse, e.g. urban results unreliable

    From 2 comments
    • The website claims the longest line of sight in my city is 24.7km from someone's garden that is surrounded by houses. I walk past this particular spot on my way to the gym. I…
      danielsamuels on HN
    • The resolution of the underlying data is only ~100m. So most houses, vegetation, etc, gets blurred into the same smooth surface. There are actually higher resolution data sets,…
      tombh on HN
  • Results show only a 2D line, no photo to verify

    From 2 comments
    • This is so clever and interesting. Congratulations! But... I want to see a photo! Or at least what it looks like in Google Earth, with a red arrow marking the furthest point. It…
      crazygringo on HN
    • Maybe including an actual picture of the sight would be helpful here?
      hybrid_study on HN

Requests

  • Add photos or Google Earth views of the lines

    From 3 comments
    • This is so clever and interesting. Congratulations! But... I want to see a photo! Or at least what it looks like in Google Earth, with a red arrow marking the furthest point. It…
      crazygringo on HN
    • Maybe including an actual picture of the sight would be helpful here?
      hybrid_study on HN
    • This is my favourite kind of HN post, and I absolutely love this one. Would love to see photos from each of these views.
      drcongo on HN
  • Show visibility in every direction, not just longest

    From 1 comment
    • Since you have the data could you show how far you can see in every direction rather than the longest direction?
      noosphr on HN
  • Visualise lines in 3D with exaggerated relief

    From 1 comment
    • This is so clever and interesting. Congratulations! But... I want to see a photo! Or at least what it looks like in Google Earth, with a red arrow marking the furthest point. It…
      crazygringo on HN

Questions

  • How is refraction handled in the calculations

    From 2 comments
    • "Viewsheds" of any location can be calculated and matched with photographs using "GeoImageViewer", an application I wrote a couple of years ago. Any feature in the photo can be…
      hdersch on HN
    • The jump from "we can compute this" to "we computed it for the entire planet" is what makes this impressive. A lot of projects stop at the proof of concept. Running hundreds of…
      BuleBule on HN
  • Why the reported distance differs from other calculations

    From 1 comment
    • Hi Tom it's Marc, I'm glad to see you finished your sightline project ! Any clue why you report the longest sightline as "530.8 km" when it seems to be actually 538.1 km? That's…
      mrb on HN

Alternatives named

  • Line-of-sight map by incoherency

    From 1 comment
    • Neat. I did a related project a little while ago. I wasn't interested in how far I can see from everywhere, so much as what I can see from one place in particular. So in mine you…
      jstanley on HN
  • Udeuschle panorama tool

    From 1 comment
    • Could it be this? https://www.udeuschle.de/panoramas/makepanoramas.htm
      tombh on HN
  • GeoImageViewer viewshed app

    From 1 comment
    • "Viewsheds" of any location can be calculated and matched with photographs using "GeoImageViewer", an application I wrote a couple of years ago. Any feature in the photo can be…
      hdersch on HN

Category, keywords, summaries and labels on this page were made by AI (Thread Reader v2) and not checked by hand. Each point links to the comments it came from.

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