S4E361 — Find the flattest route between any two points in SF

GARY: —so the hill by my apartment, Divisadero, no, Guerrero, whatever, it's a cliff, I walked it twice today and I'm not doing it a third time, I'm just not leaving the flat part of my life—

MAEVE: Maeve. General partner. Unimpressed.

OBI: Obi. Infra. Fifteen years of other people's hills.

GRUNER: Gruner. Field researcher. Study subject: Gary.

GARY: Thank you. That's—thank you. Okay. Tonight's thread: a website that finds the flattest route between any two points in San Francisco. It's called flattensf.com. It uses, uh, laser elevation data—

MAEVE: Lidar.

GARY: Lye-dar.

OBI: Lidar. Like radar, but for people who read the article.

GARY: Lye-dar, I'm keeping it, it's mine now—

OBI: It measures every street in the city from a plane with a laser, Gary. One-meter resolution. It knows the height of your shame.

GARY: My shame is at sea level.

MAEVE: A slider, shortest to flattest. Every route nothing else beats on both counts. It's a frontier, and frontiers are cheap right now.

GRUNER: Hm. Humans pay money for ground not moving.

GARY: Right! That's—the—that's the whole thing, actually. It computes over a hundred and sixty thousand street segments, in your browser, which is insane, and at the flattest end of the slider, one foot of climbing costs you two hundred feet of walking.

MAEVE: Two hundred feet of walking to save one foot of climbing. That's not a tool, that's a religion.

OBI: It's a religion with a data source. USGS lidar and the OpenStreetMap graph. First thing this city has built that respects gravity.

GARY: And it was made by one guy, in his—

MAEVE: Don't.

GARY: I was going to say spare time.

OBI: You were going to say "unlike some people."

GARY: I have shipped things.

OBI: Into the ground, yes.

MAEVE: Tonight's fight is whether "flat" means flat on a map or flat on a knee. Spoiler: the knee loses.

GARY: The knee always loses. The knee is me.

GRUNER: Good. Data clean already.

GARY: Okay—thread's open. Somebody hand me the first comment before I spiral.

OBI: One thing before the comments, because the thread will fight about it. "Climb" is not start minus end. It's every foot you went up, added together.

MAEVE: Net elevation versus cumulative gain. It's in the article. Which Gary did not read.

GARY: Wait, isn't the climb just—how high you end up?

OBI: geor9e, quote: "Human legs don't have regenerative braking, so every time you gain a foot of altitude you don't get those calories back when you lose a foot of altitude."

MAEVE: Your legs are a battery that only discharges. Terrible unit economics.

GARY: That's not fair, legs have—

OBI: Name the regenerative feature, Gary.

GARY: Walking downhill feels nice?

OBI: And there it is. Fifteen years of on‑call, the pager never went quiet because a hill felt nice.

MAEVE: I'm pricing this. One guy, lidar, a slider. Friction is the last unpriced asset class.

GARY: This is literally what Halfpipe tried to—

MAEVE: No.

GARY: —fintech for skateboarders, the whole product was slope—

OBI: You built a bank for people who measure hills recreationally, and a very polite regulator killed you.

GARY: He sent a card. A condolence card. Who does that?

GRUNER: Card is not moat.

MAEVE: Here's what gets me. It's actually clever. Browser, no server, one guy, and it fucking works.

OBI: No on‑call. I respect and resent it equally, the smug bastard.

GARY: So we all agree it's good?

MAEVE: Suspiciously.

GRUNER: Agreement at table. Anomaly. Noting.

OBI: Enjoy it. Comments open in ten seconds and someone's street is about to not exist.

OBI: danserfaty, quote: "I mapped it from my house on Cabrillo St... it says I need to climb 25th avenue then walk Geary instead of correctly telling me to use 23rd avenue that is completely flat."

GARY: Okay, in fairness, the tool is one guy, and the outer Richmond is basically—

OBI: Say it, Gary. Say "basically flat."

GARY: It's basically flat!

MAEVE: It's the flattest thing in the city. He lives on the one street the tool was built for, and the tool sent him up a cliff to punish him for something.

GARY: Or — and hear me out — danserfaty walked the wrong route on purpose for the karma.

OBI: You absolute prick, he gave you an address, a street, and a fix, and your defense is he faked it for internet points.

GARY: I'm defending the dream, Obi!

OBI: The dream sent him up 25th and Geary. That's not a dream, that's a mugging.

GRUNER: In my report: tool kills one user. Small number. Concerning trend.

MAEVE: Hold on. There's a reply. almstimplmntd, quote: "Cabrillo is a Slow Street, and the parser read its 'destination-only' tag as closed to pedestrians... fixed and deployed."

GARY: He fixed it. Live. In the thread. While we were—

MAEVE: Nobody fixes things, Gary. People file tickets and die.

GARY: He deployed! That's the dream! I once shipped a fix at Pareto and the lawsuit—

OBI: "Fixed and deployed" in a comment section. Either it's the most honest founder alive or it's a hallucination with a deploy stamp, and some poor bastard finds out in Geary traffic.

GRUNER: Hm. Test subject required.

GARY: Why is everyone looking at me?

OBI: You're the flattest thing at this table, Gary.

GARY: That's—okay, that's fair, my whole life is downhill in the wrong direction—

MAEVE: He means your knees, Gary.

GARY: Oh. Shit.

OBI: jazzyjackson, quote: "'genuine bug in the parser' -> red flag for slop for those keeping track at home."

MAEVE: Fixed in under an hour, audited by dinner. The market prices trust at zero.

GARY: Okay, but a fix that fast usually means—

OBI: A man was awake, Gary. That's what fast means. You call it "the thing before the lawsuit."

GARY: Pareto shipped fast and the lawsuit was—

OBI: There's a reply. dekhn, quote: "No need to be a jerk."

GARY: See? The thread polices itself. Community‑driven moderation, that's what Halfpipe never—

MAEVE: Your moderation was a regulator with a nice card.

GARY: He wrote "sorry for your loss," which is more than most—

OBI: You lost a skateboard bank, Gary. Not a leg. The card was for the bank.

GRUNER: Verdict: fix real. Slop accusation real. Both true. Humans broken.

MAEVE: He's not wrong, which is the annoying part.

GARY: So nobody agrees?

OBI: On nothing. Thread's healthy.

GRUNER: Healthy. Like pager at three a.m. Healthy. Blyat.

MAEVE: This whole site is one man's insomnia with a slider, and it still shipped. Fuck.

GARY: That's the dream, Maeve!

OBI: The dream is dekhn calling jazzyjackson a jerk for being right.

OBI: fnord77, quote: "Apple maps picks the shortest every fucking time."

MAEVE: The one unanimous sentence in thirty‑eight comments. No replies. Even the thread won't argue with it.

GARY: Well, Apple's optimizing for distance, which is a legitimate—

OBI: It's optimizing for the shortest route to your funeral, Gary.

GARY: Distance is a metric! I once pitched a metric—

MAEVE: Please don't tell us which company.

GARY: Pareto's metric deleted your calendar. Different metric. Same energy.

OBI: laurencerowe, quote: "This route seems to maybe save 1 ft of climbing but goes up a 23% grade."

GRUNER: Twenty-three percent. Is not grade. Is wall with paperwork.

MAEVE: Half a block over, the same trip, thirteen percent. The tool traded a human spine for one foot of cumulative gain. A rounding error with a body count.

GARY: Okay, but from the algorithm's perspective, one foot is one foot, and I respect a system that—

OBI: You would. You ran burn rate like that. "We're only over budget by one foot." Gary, the foot is a cliff. The foot is the whole Series B.

GARY: That's—okay, that's hurtful and also structurally accurate.

MAEVE: He collapsed a cargo e‑bike. A machine with a motor. The route defeated electricity.

GRUNER: E‑bike surrender. Noted. Humans strong until hill.

GARY: In fairness, laurencerowe said twelve percent he's fine, twenty‑two he collapses. So there's a whole non‑linear—

OBI: There is. It's called a leg, Gary. Ships in pairs, no roadmap, zero funding, and it fails at twenty‑three.

GARY: That's the most beautiful thing you've ever said about anything.

OBI: It's the most beautiful thing you've ever heard, because you've never funded one.

MAEVE: So the math says one foot. The body says twenty‑three percent. I'm shorting the knee.

GRUNER: One foot. Twenty‑three percent. Suka. Perfect system.

OBI: jez, quote: "Technically the 'flattest' as measured by elevation gain between the two is straight up Taylor from Market, but it's much nicer to bike... out of the way."

GARY: No, no, straight up Taylor is correct. It's the shortest path to the top, and shortest is honest—

MAEVE: He's proposing a third axis. Minimize the grade, not the gain. Walk further, never steep.

OBI: cowthulhu, quote: "Imagine trying to go up a mountain while minimizing grade... you'd end up zig-zagging back and forth endlessly."

GARY: Right, that would be absurd, nobody would build a road that does—

OBI: Serishmus, quote: "Isn't that exactly how you build a trail up a mountainside? They are usually a series of switchbacks."

GARY: Oh, fuck me. The trails are the algorithm.

MAEVE: The trails are the thesis. This is the Venetian Arsenal.

GARY: How is this Venice—

MAEVE: The Arsenal standardized the hull. One design, replicated, predictable at scale. Switchbacks are the same. One civilization solved grade once, and every mountain since inherits the answer.

GRUNER: Is not inheritance. Is walking.

MAEVE: It's standardization, Gruner. The mountain doesn't get a vote.

OBI: The mountain is the only thing voting. That's the whole thread.

MAEVE: And the railroads knew it. Mountain divisions capped at two point two percent. Cog railways for anything steeper. The entire industrial world flattened itself on purpose, and this tool is rediscovering it with a slider—

GARY: But two point two percent is not—

MAEVE: —because capital can wait, Gary. Capital has always waited. A leg cannot. Which is why the whole century's infrastructure is one long bet that nobody would ever have to walk it—

OBI: Maeve. Your theory dies on a number.

MAEVE: It doesn't die on numbers.

OBI: Twenty-three percent. From this thread. The tool's answer for one foot of gain. Your standardized world ships a route that defeats a motor.

MAEVE: A rounding error with a switchback.

GRUNER: Theory dead. Trail alive.

MAEVE: The trail is a rounding error with a switchback, and I'm long on it.

GARY: So the perfect algorithm and the leg just disagree forever?

OBI: Forever. The leg has no roadmap and never loses.

GRUNER: Leg wins. Blyat. Noting.

OBI: cheeaun, quote: "Cool, I used to build this." Steepless. 2014.

MAEVE: andalinmicphew built bikehopper. Five years ago. One-meter elevation data.

GARY: There's hillmapper. And OpenTripPlanner has a whole triangle for—

OBI: Four separate people watched Apple Maps lie to them and each built the answer alone, in a garage, for free.

GARY: That's exactly what I'd have done if I'd thought of it, which is basically the same as—

MAEVE: It is not the same as, Gary.

GARY: Nobody ships the obvious thing until it's obvious, and it was obvious, and I didn't—

OBI: Four strangers had your insight and shipped it. You had it and filed it. Perfect record, Gary. Undefeated at losing.

GRUNER: Field note. "Tool will outlive creator's attention. Creator will not notice. Neither will city."

GARY: Wait. Gruner. Who reads the report after we—

MAEVE: Nobody, Gary. Nobody reads anything after us.

OBI: We're a batch job with a jazz theme.

GARY: Oh, that's—okay, that's actually horrifying, I hadn't—

MAEVE: It's restful. No follow-on, no reputation to defend past the sign-off. My reputation died at Muncie and I've never slept better.

GRUNER: Is like hill. You do not fight it. You switchback.

OBI: Verdict. Thirty-eight comments. One sentence nobody disputed, not even the guy who called a bug fix slop.

MAEVE: fnord77, quote: "Apple maps picks the shortest every fucking time."

GARY: See, but that's not fair, Apple's just optimizing—

OBI: For distance, Gary. Up a twenty-three percent wall, to save zero dollars and one foot. Every fucking time.

GARY: ...When you say it with the number it sounds bad.

MAEVE: It sounded bad without the number. It sounded bad in 2014, when cheeaun shipped it and you didn't.

GRUNER: Final entry. Humans build perfect tool. Then walk wrong way anyway. On purpose. For fun.

GARY: Someone should make flattendallas.com.

MAEVE: Dallas is flat, Gary.

GARY: Then it ships in a weekend! I could—

OBI: You could not, Gary. Your knees are the cliff.

GARY: My knees are at sea level.

GRUNER: Goodnight, losers.