New Hilbert-based tile addressing and 75000x compression in PMTiles v3
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collecting some training data
(sources: Mapillary, Bing Aerial)
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My big geo startup idea is Not Hotdog. Give it a satellite image and it tells you yes/no does this contain a Wienerschnitzel restaurant
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Put together some thoughts on news maps in 2022 and how the tools are evolving going into 2023 and beyond.
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Tippecanoe 2.17 is now available through Homebrew and MacPorts:
formulae.brew.sh/formula/tippec
ports.macports.org/port/tippecano
Thank you sikmir and for the updates!
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the pmtiles hilbert ID scheme lets extract multipolygons be represented as two sets of 64-bit integers: one set for the boundary, and one for the interior, which compresses millions of Z/X/Y coordinates into single runlengths on the curve (colors)
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multipolygons also mandatory for real tasks like
"make a map of France including overseas départements"
"overlay this data on all 50 US states but don't include Canada or too much ocean"
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turns out the simple use case for polygons should still be built on multipolygons to handle the antimeridian
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prototyping `pmtiles extract` - given a big tile archive, efficiently extract any multipolygon area into a smaller archive
creating progressively more difficult areas via 's excellent union/subtract operations...
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Will be a bummer if Toner, Terrain and Watercolor maps go dark soon
"the cost of maintaining this service is quite high, and we have not been able to get sufficient sponsorship from open source programs or financial support to maintain this service through 2023."
Quote Tweet
We'll have some more clarity about this in the new year. twitter.com/LisaHornung_/s…
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New Tippecanoe version (2.17) at github.com/felt/tippecanoe adds first-class support for writing and reading PMTiles.
Convert GeoJSON datasets, then visualize in the browser with the drag-and-drop viewer: protomaps.github.io/PMTiles/
no databases or running servers necessary!
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need some fact checks on this caveats section of the README I just wrote:
or anyone with Indic text knowledge want to chime in?
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I haven't checked in on the harp.gl WebGL vector tile renderer in a while, but it looks like it's either stopped development or gone closed source:
github.com/heremaps/harp.
Without harp/tangram is the only open source WebGL option left?
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Converting the awesome BellTopo Sans font by takes ~3 seconds and you can preview it instantly on the map
sarahbellmaps.com/belltopo-sans-
maplibre.org/font-maker
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Here's one more thing to help you build 100% static file map applications - a useful complement to loading tile archives in MapLibre GL
Runs client side on your local font .ttfs via WebAssembly/Emscripten!
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3 of the newly elected mayors in northern taiwan have a handwave-y concept of "Asian Silicon Valley" as part of their political brand
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Taiwan pollsters are so good…
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Last stop, they already took the projected numbers off the big screen in camp Huang but the venue is 1/5 the size of the others
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Stop 2 of 3
Think they over provisioned seats at Chen HQ
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Stop 1 of 3, everyone is glued to numbers going up on big screens or their phones
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time to hit up some live election results in Taipei, thankfully everyone is near the blue MRT line today
I've got all 3 of my flags from yesterday to camouflage myself
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The 國旗 ratio at Huang’s rally is about 1/4 of Chiang (Chen at 0% of course)
Enough for today, more tomorrow as live results roll in
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Most people here look about gamer age
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City hall for 33…
It’s raining hard enough that my phone screen is glitching out
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Everyone looks about 20 years younger vs the last rally but maybe just arriving later
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Most people are double fisting a candidate flag and a Blue Sky White Sun Blood of Patriots flag, saw someone pull a bunch more 國旗s out of a bag saying they were from last time
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There’s some kind of dubstep wuxia performance happening which is pretty sick
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Visiting Golden Boy Chiang whose rally is in a parking lot
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They ran out of inflatable baseball bats so I had to settle for a flag
On to the next one which is across the city…
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It’s raining and there are a ton of people, mostly 60+. The crowd control is immaculate
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Checking in on Clock Chen first
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election eve in taiwan: it is time to go to every rally, happening simultaneously 7-10pm tonight
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Looked back on a copyright case law wikipedia article I wrote 12 years ago, surprised to see it's been edited 20 times since, though mostly by robots
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It ought to be basic etiquette to greet others when Twitter opens at 8am, and say farewells when it is about to go offline for the day
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They can save 50% by making Twitter available only 12 hours a day right
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✨🚆 new project! amtrakexplorer.com
I made a site to geographically explore the network. Take a look, and consider rail travel for your next trip! :)
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looked briefly into deploying a Mastodon instance and stopped at "you need a PostgreSQL db"
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