Live data from Hacker News

Reverse geocoding is hard

shkspr.mobi

111–120 of 139 posts

Re: Reverse geocoding is hard

#111
post #90

Earlier quoted context omitted.

Damn! 7cm per year feels blazing fast when you consider the fact that it's a whole continent.

I mean I'm still mind blown that the Three Gorges dam in China literally changed the rotational speed of the Earth, and thus the length of the day.

You can change the length of the day just by spinning counterclockwise :P

Re: Reverse geocoding is hard

#112
post #25
post #24

maybe the 'three words' model? Seems like it would be specific enough to locate a bench

WhatThreeWords is a proprietary algorithm and has problems with homophones.

I thought W3W was specifically designed to mitigate homophone problems, it seems pointless otherwise...

Re: Reverse geocoding is hard

#113
post #15

It's a lot more expensive, but measuring navigation distance rather than straight line distance would avoid the "river" issue. Although depending on the routing engine and dataset it might well introduce more issues where points can be really close on foot but the only known route is a driving route.

If you know of an API which does navigation distance to POI, I'd love to hear about it!

To share a related river issue, a few years back the city of Gothenburg, Sweden switched how they allocate students to a school. It used to be the student would get a school in their specific section of the city ("statsdel"). The new one lets you choose a school, specified in rank order, even if it's in another part of the city.

You could select from a list of schools, with distances given as straight-line distance (or perhaps as route distance? I can't tell from the articles I've read), which meant some of the schools across the river were considered "close".

In one case, a student had a 45 minute commute to get to school, due to waiting for the ferry. The parents listed it as their 5th choice, based on the stated distance. The more critical factor should be travel time, but the computer system doesn't take mass transit schedules into account.

As a contributing factor, the list of schools did not include the name of the stadsdel in the list of schools. This extra sort of reverse geocoding - trivially available - might have helped them realize the issue.

One news story about it, in Swedish: https://www.svt.se/nyheter/lokalt/vast/kaos-i-antagningssyst...

Re: Reverse geocoding is hard

#114

Earlier quoted context omitted.

accounts for (something) , phrasal verb meaning "considers; incorporates; takes on board" as opposed to the more obvious "gives rise to; is responsible for". I had to read twice too

Yeah, I know what "accounts for" means. I just can't comprehend how GPS coordinates could account for the tectonic plates' motion. Never heard of such a thing, and can't see how it would work on a conceptual, mathematical level.

They don't, and you're right it wouldn't make sense.

Re: Reverse geocoding is hard

#115

Earlier quoted context omitted.

That's about correcting the ground stations' coordinates. It doesn't help keeping your house's GPS coordinates fixed. If the tectonic plate your house is built on moves a meter over the course of a decade, then your house's GPS coords will change in the lower decimals, and eventually your government's land registry will need to update those values.

Hopefully there are still governments that don’t keep such in detail land registries, or any land registries at all, for that matter. Some of us don’t want the State to see everything, at almost every moment in time.

If the state doesn't know that you own a piece of land, then you don't own that piece of land. Simple as.

Re: Reverse geocoding is hard

#116

Not my area of expertise, but is this not a form of perfectionist problem? I mean, most places have a clear and simple address. For the rest, either a human can solve it, or we can make a few examples and let an AI do the work. We can go back to them later and revise them if we need to. Addresses don't change often, so I think things can stay the same for a long time. Except for emergency dispatch and a few high-prof…

The author's problem is similar to many real-world business problems. A simple example is directing delivery drivers to the correct entrance of a large site with multiple entrances depending on the type of delivery (mail to door A, van to door B, semi-trailer to door C).

Sending a Romanian truck driver to a vague address in Holland such as ‘port terminal B somewhere on road 999’ and leaving him to figure it out for himself is not a solution.

Re: Reverse geocoding is hard

#117

Earlier quoted context omitted.

Hopefully there are still governments that don’t keep such in detail land registries, or any land registries at all, for that matter. Some of us don’t want the State to see everything, at almost every moment in time.

If the state doesn't know that you own a piece of land, then you don't own that piece of land. Simple as.

You simply do not own any peice of land at all. The state owns all the land. You simply lease it.

Re: Reverse geocoding is hard

#118

Earlier quoted context omitted.

If the state doesn't know that you own a piece of land, then you don't own that piece of land. Simple as.

You simply do not own any peice of land at all. The state owns all the land. You simply lease it.

Well, in some countries this might be true.

Re: Reverse geocoding is hard

#119

Earlier quoted context omitted.

You simply do not own any peice of land at all. The state owns all the land. You simply lease it.

Well, in some countries this might be true.

It's true in all countries to the extent that it's true in any countries, but it's only partially true to begin with. The reality is that ownership doesn't exist. What actually exists is a credible threat to use violence if certain conditions are violated. In a civilized society this comes from the state. In a failed state it comes from somewhere else.

Re: Reverse geocoding is hard

#120
post #16

If I were giving directions to another human and not using house addresses I'd say something like "Queen street about half way down the block between Crawford and Shaw"

That's great for cities with a grid layout, but ignores most of the world. How would you give directions to something in the middle of a park?

send a map pin :P
Post reply on HN