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durkie

1,529 karma · joined December 20, 2011

materials scientist / fruit picker / industrial automation / lost somewhere

riding every road at https://wandrer.earth co-founder http://www.concrete-jungle.org co-founder https://www.comingle.io (NSFW)

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durkie··on Ask HN: What interesting problems are you working on?
this sounds so cool! i wish you the best luck with it.
durkie··on Spain launches free train tickets for short and medium journeys from Sept to Dec
Where are your favorite places to ride near Barcelona?
durkie··on 4.2 Gigabytes, Or: How to Draw Anything
spacebar too. just jumps you right back to the top.
durkie··on Telegram is asking German users when to share information with law enforcement
I have a "pin reminders" setting in iOS signal that I can turn off. It's in Settings > Account
durkie··on Litetree – SQLite with Branches
ooh this is really cool. hopefully it works with something like spatialite. i have a need to store the OpenStreetMap road network at various points in its history and being able to branch and update those branches without each consuming gigabytes more of data would be super useful.
durkie··on Show HN: mbtiles-s3-server – serve vector map tiles directly from mbtiles on S3
I've got an nginx version here too: https://github.com/durkie/ngx_http_mbtiles_module
durkie··on Why do people not notice our enormous, prominent, clear and contrasting banner?
why do you get to say "psychic warfare" but "psychic violence" is unacceptable?
durkie··on Reasons to tour by bicycle
Yeah, just depends on where you're going. We just finished a 4-day tour along the Neckar river in Germany and didn't carry anything extra (except maybe some leftover pastries from breakfast). But then long days up in the north Georgia mountains will require several hearty sandwiches, lots of small snacks, extra electrolytes and maybe a water filter.
durkie··on Select ’Hello, World’: Serverless Postgres Built for the Cloud
can you describe how compute scaling works? I do a lot of work in PostGIS, which can have big CPU needs depending on the function being invoked, so my workload can look super bursty from a CPU perspective.
durkie··on D1: Our SQL database
Seconding a vote for Spatialite support! I came here just to make that same request.
durkie··on We're Not Even Close to EVs Being as Cheap as Gas Cars, Mercedes Says
Here's one example: Tesloop operates a Tesla only taxi service in southern California. 6% battery degradation over the first 194,000 miles. Battery was replaced at this point, and the subsequent one had 22% degradation over an additional 130,000 miles, but this is thought to be related to frequent supercharging, and frequent supercharging to 95-100% state of charge (not recommended).

https://www.teslarati.com/tesloop-tesla-model-s-400k-miles-b...

durkie··on Ask HN: What makes some metals shine?
This texture very often is the result of galvanizing the base steel to prevent/reduce corrosion: coat it with zinc so it "rusts" preferentially to the iron base metal. Similar to a sacrificial anode on a boat: "here, seawater, you need to eat something, so eat this chunk of zinc instead of my fancy bronze bolts/steel hull/etc"
durkie··on S2: Computational geometry and spatial indexing on the sphere
thanks!
durkie··on S2: Computational geometry and spatial indexing on the sphere
thank you!
durkie··on S2: Computational geometry and spatial indexing on the sphere
yes, that's the true "reference" implementation, i just figured a repo from sidewalk labs (a google company) would be maybe more authoritative.
durkie··on S2: Computational geometry and spatial indexing on the sphere
i was just starting a project and considering the use of s2. i'm going with geohash instead because I would get different values for the s2 cell based on implementation.

ruby:

S2Cells::S2LatLon.new(34.1234, -84.1234).to_s2_id(30)

=> -8577780315821624425

S2Cells::S2LatLon.new(34.1234, -84.1234).to_s2_id(1)

=> -8358680908399640576

https://gojekfarm.github.io/s2-calc/ agrees with these values

python's s2sphere (from sidewalk labs, seems like it'd be more of a reference implementation) gives very different numbers:

s2sphere.Cell.from_lat_lng(s2sphere.LatLng.from_degrees(34.1234, -84.1234))

=> Cell: face 4, level 30, orientation 0, id 9868963757887927191

This discrepancy feels like it'd be some kind of signed/unsigned integer issue, but I didn't think that would be a thing in Ruby. It also doesn't seem like the level=1 cell value in Ruby would be such a large, specific number. I'm missing something.

durkie··on How to grow monosodium glutamate (MSG) crystals
One very passive method that has worked well for me in the past was to prepare a highly-concentrated salt solution (5M -- 292 g salt per liter of water) and then let the water evaporate very slowly (like only slightly open to the outside world) and left undisturbed. This left me with a roughly 2cm x 2cm x 1cm crystal of salt that is incredibly transparent (save small impurities in the center) with nice cubic features on the broad face.
durkie··on In place of a legal notice, here is a blessing
I almost feel like SQLite could have documentary made about it at this point. There are so many things about it that are just unique and fascinating.
durkie··on Should you contribute open data to OpenStreetMap?
Thanks for Stadia maps! Happy paying customer here and it substantially lowered my map hosting bill compared to mapbox.
durkie··on SQLite Release 3.37.0
seems to be -- there was a major new version out in february this year i believe. still works great, even though it's kind of weird to switch between spatialite and postgis.
durkie··on Ask HN: Would You Work for Amazon?
This is a strange comment: you take no issue with what they're saying, but seem to imply they can't have an opinion on anything they haven't personally experienced.
durkie··on Which type of plant-based milk is best?
Allowed?
durkie··on Show HN: Flatmap – a new tool to make vector tiles from OpenStreetMap data fast
at that cost it almost feels like something internet archive or aws open data could provide on a regular basis. the cost of pre-made vector tiles is huge, and making them yourself has been a huge ordeal before this...
durkie··on DIY Airless Bicycle Tire
good for him for making something cool looking, but dang this is sketchy.

modern tubeless systems are so nice that i never worry about getting a flat on my bikes, and unlike this thing, I also never worry about them coming off of the rim, even at high speed through corners/over roots and rocks.

they stop holding air as well after a few months and i squirt some more sealant in and it's fine again. for any bike that sees real use it's hard to beat.

durkie··on Ford to invest in EV and battery plants in Tennessee and Kentucky [pdf]
they already do. EU Tesla's have a different (and standard plug) compared to North American Teslas
durkie··on After Slashing 33% of Workers in 6 Years, Railroads Complain of Labor Shortages
The "just pay more" arguments are fighting back at the semantic sleight-of-hand in calling it a "labor shortage" in the first place.

"Labor shortage" frames the issue in a way that faults workers, not the business.

durkie··on Show HN: Tilemaker – DIY vector tiles from OpenStreetMap data
I've found that for about any situation where I need to display more than a couple hundred features on a map, vector tiles are superior to geojson/polyline parsing/geobuf: they're parsed very fast and tippecanoe has compression, simplification, feature removal (for low zooms), and tile size limiting features

In my case I use it to display roads that a person has walked/biked, so you can easily accumulate thousands of items to display.

durkie··on Organic and regenerative agriculture are revitalizing rural Montana economies
There are definitely plenty of towns I've been to in rural America (north GA) that are clearly hollow shells of their former selves. And it's way more fun and interesting to be in a place that does have a thriving local economy. The socioeconomic benefits are clear. I'm just wondering if theres a way to frame it in economic terms, or if everything about resiliency, more local jobs, etc. are basically all "externalities".
durkie··on Organic and regenerative agriculture are revitalizing rural Montana economies
Is there an economic argument to be made for increasing the amount of money spent in the local economy?

I often hear it cited as a benefit in situations like this, and it has a certain feel-good quality to it, but instinctively it feels like it means people pay higher prices: if you're buying seed from the local seed & feed, it's almost certainly more expensive than if you buy it from XYZ megacorp.

durkie··on Show HN: Tilemaker – DIY vector tiles from OpenStreetMap data
tilemaker really is fantastic. I make regular use of it (and tippecanoe) to slice and dice tilesets and it works well and is fast. it feels like it's right on the cusp of being an easyish way of generating vector tiles for the whole planet at a cost below $100. I can't wait for it to get there!
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