2d:null 2e:["$","title",null,{"children":"Breathing Earth 🌍 | Christophe Yamahata | Observable"}] 33:T9f7,function geoWarp(targetProjection, context) { /* * geoWarp is designed to have a similar interface to geoPath -- it takes a * projection and a context, and returns a function. The function can be used * to paint an image onto a canvas context, much like how a path function can * be used to paint GeoJSON geometries. */ return function(sourceProjection, image) { const bounds = d3.geoPath(targetProjection).bounds(sphere); const sourceContext = DOM.canvas(width, height).getContext("2d"); sourceContext.drawImage(image, 0, 0, width, height); const source = sourceContext.getImageData(0, 0, image.width, image.height) const sourceData = source.data; // TODO the dimensions of the target are hardcoded; can we get them from the context instead? const target = context.getImageData(0, 0, width, height); const targetData = target.data; // make a "cheat sheet" by projecting the sphere and filling it; we can use the resulting image data // to decide whether to invert or not. const cheatSheetContext = DOM.context2d(width, height); cheatSheetContext.beginPath(); d3.geoPath(targetProjection, cheatSheetContext)(sphere); cheatSheetContext.fill(); const cheatSheetImageData = cheatSheetContext.getImageData(0, 0, width, height); const cheatSheetData = cheatSheetImageData.data; for (var y = 0; y < target.height; y += 1) { for (var x = 0; x < target.width; x += 1) { let i = (y * target.width + x) * 4; // compute `i` early so we can use it for the cheat sheet const cheatPixelAlpha = cheatSheetData[i + 3]; // if any cheat pixel isn't black, it hasn't been filled when we projected the sphere, so skip it. if (cheatPixelAlpha === 0) { continue; } const p = [x, y]; const s = targetProjection.invert(p); if (!s) continue; const [λ, φ] = s; if (λ > 180 || λ < -180 || φ > 90 || φ < -90) continue; const q = sourceProjection([λ, φ]); const u = Math.round(q[0]), v = Math.round(q[1]); let now = performance.now(); // let i = (y * target.width + x) * 4; let j = (v * image.width + u) * 4; targetData[i] = sourceData[j]; targetData[++i] = sourceData[++j]; targetData[++i] = sourceData[++j]; targetData[++i] = 255; } } context.putImageData(target, 0, 0); } }34:Tb17,//import {Scrubber} from "@mbostock/scrubber" // Function adapted to add a title function Scrubber( values, { title = "", width = 500, format = value => value, initial = 0, direction = 1, delay = null, autoplay = true, loop = true, loopDelay = null, alternate = false } = {} ) { values = Array.from(values); const form = html``; let frame = null; let timer = null; let interval = null; function start() { form.b.textContent = "Pause"; if (delay === null) frame = requestAnimationFrame(tick); else interval = setInterval(tick, delay); } function stop() { form.b.textContent = "Play"; if (frame !== null) cancelAnimationFrame(frame), frame = null; if (timer !== null) clearTimeout(timer), timer = null; if (interval !== null) clearInterval(interval), interval = null; } function running() { return frame !== null || timer !== null || interval !== null; } function tick() { if (form.i.valueAsNumber === (direction > 0 ? values.length - 1 : direction < 0 ? 0 : NaN)) { if (!loop) return stop(); if (alternate) direction = -direction; if (loopDelay !== null) { if (frame !== null) cancelAnimationFrame(frame), frame = null; if (interval !== null) clearInterval(interval), interval = null; timer = setTimeout(() => (step(), start()), loopDelay); return; } } if (delay === null) frame = requestAnimationFrame(tick); step(); } function step() { form.i.valueAsNumber = (form.i.valueAsNumber + direction + values.length) % values.length; form.i.dispatchEvent(new CustomEvent("input", {bubbles: true})); } form.i.oninput = event => { if (event && event.isTrusted && running()) stop(); form.value = values[form.i.valueAsNumber]; form.o.value = format(form.value, form.i.valueAsNumber, values); }; form.b.onclick = () => { if (running()) return stop(); direction = alternate && form.i.valueAsNumber === values.length - 1 ? -1 : 1; form.i.valueAsNumber = (form.i.valueAsNumber + direction) % values.length; form.i.dispatchEvent(new CustomEvent("input", {bubbles: true})); start(); }; form.i.oninput(); if (autoplay) start(); else stop(); Inputs.disposal(form).then(stop); return form; 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31:{"id":"1eafe92bb261c511","slug":"breathing-earth","title":"Breathing Earth 🌍","thumbnail":"0be7af059328989db3ac1ba221a4304d65e8405f4ac890667914afb53a173081","access_level":"public","create_time":"$D2024-01-14T13:39:59.297Z","update_time":"$D2024-01-15T22:48:53.872Z","view_time":null,"first_public_time":"$D2024-01-14T13:39:59.297Z","has_unpublished_edits":null,"fork":{"id":"30a5bc5415261111","slug":"video-reprojection-on-a-map","title":"Video reprojection on a map","owner":{"id":"dd67891d326bcfb1","login":"christophe-yamahata","name":"Christophe Yamahata"}},"stars":0,"starred":false,"owner":{"type":"team","id":"dd67891d326bcfb1","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":"starter_2024"},"version":2317,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"06f083eba60f5a76","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":null}],"members":[{"type":"individual","id":"06f083eba60f5a76","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":true,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":{"id":"5ea5ed43fe2a637d","slug":"maps","title":"Maps","owner":{"id":"dd67891d326bcfb1","login":"christophe-yamahata","name":"Christophe Yamahata"}},"type":"notebook","body":{"title":"Breathing Earth 🌍","cells":[{"id":0,"value":"md`# Breathing Earth 🌍\n## Biosphere, Perpetual Ocean, Clouds, CO₂, ...`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2155,"value":" viewof src = Inputs.select(new Map([[\"Biosphere\", biosphere], [\"Perpetual Ocean\", perpetual_ocean], [\"Sea Surface Temperature\", sea_surface_temperature], [\"A year of Earth's CO₂\",earth_1year_co2], [\"Swirling clouds\", clouds], [\"Winds\", winds]]), {value: \"Biosphere\", label: \"Video source\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":602,"value":"viewof frameIdx = Scrubber(framesMap.keys(), {\n loop: true,\n autoplay: true,\n loopDelay: 3000,\n title: \"Video played in loop\"\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1557,"value":"map = {\n\n const context = this ? this.getContext(\"2d\") : DOM.context2d(width, height),\n canvas = context.canvas;\n \n const render = function() { \n\n context.fillStyle = \"rgba(10,30,50)\";\n context.fillRect(0, 0, width, height)\n\n const warp = geoWarp(projection, context);\n warp(projection_equirectangular, image);\n\n const path = d3.geoPath(projection, context);\n \n context.beginPath();\n path(land);\n \n context.fillStyle = \"rgba(100,100,200,0.2)\";\n context.filter = \"blur(15px)\";\n context.fill(\"evenodd\");\n \n context.beginPath();\n path(land);\n context.lineWidth = 2; \n context.strokeStyle = \"rgba(0,0,0,0.3)\";\n context.filter = \"blur(6px)\";\n context.stroke();\n context.filter = \"blur(0px)\";\n\n }\n \n render(); \n\treturn canvas;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1625,"value":"// viewof lambda = Inputs.range([-180, 180], {value: -35, step: 0.5, label: \"lambda, λ (°)\"})\nviewof lambda = Scrubber(Array.from({length: 720}, (_, i) => 0.5*i), {title:\"lambda, λ (°)\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1634,"value":"viewof phi = Inputs.range([-90, 90], {value: -25, step: 1, label: \"phi, φ (°)\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1639,"value":"viewof gamma = Inputs.range([-90, 90], {value: 0, step: 1, label: \"gamma, γ (°)\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2143,"value":"
\n⮦ Original video [Source: NASA Scientific Visualization Studio].","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":604,"value":"image = framesMap.get(frameIdx)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":911,"value":"md`-----\n### Appendix`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":684,"value":"video_src = src.url()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2150,"value":"biosphere = FileAttachment(\"biosphere@2.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2146,"value":"perpetual_ocean = FileAttachment(\"perpetual_ocean.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2194,"value":"sea_surface_temperature = FileAttachment(\"Sea_surface_temperature.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2198,"value":"earth_1year_co2 = FileAttachment(\"Earth_1year_CO2.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2205,"value":"clouds = FileAttachment(\"Clouds.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":2312,"value":"winds = FileAttachment(\"winds.mp4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1491,"value":"factor = 0.35","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":516,"value":"width = factor*image.width","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":389,"value":"height = factor*image.height","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":728,"value":"framerate = 30","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":322,"value":"projection_equirectangular = d3.geoEquirectangular()\n .fitExtent([[2, 2], [width-2, height-2]], sphere);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1005,"value":"projection = d3.geoOrthographic()\n .rotate([lambda, phi, gamma])\n .fitExtent([[2, 2], [width-2, height-2]], sphere).scale(130);","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":819,"value":"$33","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":20,"value":"sphere = ({ type: \"Sphere\" })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":22,"value":"land = topojson.feature(world, world.objects.land)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"world = d3.json(\"https://unpkg.com/world-atlas@1/world/110m.json\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":18,"value":"topojson = require(\"topojson-client@3\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":594,"value":"framesMap = eachFrame(video_src, framerate, -1, 0, {\n crossOrigin: 'anonymous',\n debug: true\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":606,"value":"eachFrame = async (video_src, framerate, limit = -1, start = 0, options = {}) => {\n const debugLabel = `eachFrame on ${JSON.stringify({\n video_src,\n framerate,\n limit,\n start,\n options\n })}`;\n if (options.debug) console.time(debugLabel);\n // To gain some time, the duration can be passed in the options\n const duration =\n options.duration === undefined\n ? await vidvid.info(video_src, options).then(info => info.duration)\n : options.duration;\n const numFrames = limit == -1 ? duration * framerate - start : limit;\n const framesArray = new Map();\n for (let i = start; i < numFrames; i++) {\n const t = i / framerate;\n framesArray.set(i, await frameAt(video_src, t, options));\n }\n if (options.debug) console.timeEnd(debugLabel);\n return framesArray;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":626,"value":"async function eachFrameArray(video_src, framerate, indexesArray, options = {}) {\n const debugLabel = `eachFrameArray on ${JSON.stringify({\n video_src,\n framerate,\n indexesArray,\n options\n })}`;\n if (options.debug) console.time(debugLabel);\n\n const framesArray = new Map();\n for (let i = 0; i < indexesArray.length; i++) {\n framesArray.set(\n indexesArray[i],\n await frameAt(video_src, indexesArray[i] / framerate, options)\n );\n }\n if (options.debug) console.timeEnd(debugLabel);\n return framesArray;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":596,"value":"every5FramesMap = eachFrameArray(video_src, framerate, [0, 5, 10, 15], {\n crossOrigin: 'anonymous'\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":765,"value":"//vidvid = import('https://unpkg.com/vidvid-info?module')\nvidvid = import(await FileAttachment(\"vivid-info-0.1.7.js\").url())","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":797,"value":"import { frameAt } from \"@severo/frameat\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":608,"value":"$34","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1858,"value":"disposal = Inputs.disposal","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":7,"value":"d3 = require(\"d3@6\",\"d3-fetch\", \"d3-geo\", \"d3-geo-projection\", \"d3-geo-polygon\", \"d3-inertia@^0.4\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":518,"value":"stylesheet = html`\n(restyle images to be no wider than the main text)\n\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1560,"value":"html`