25:["$","title",null,{"children":"Where will trees move in the future? | Nistara | Observable"}] 49:Tfca,map = () => { const wrapper = d3.create("div") .style("width", `${width}px`) .style("height", `${height}px`) .style("position", "relative"); wrapper.append("style").html(css); // Raster layer const canvas = wrapper.append("canvas") .style("position", "absolute"); canvas.node().width = width; canvas.node().height = height; const context = canvas.node().getContext("2d"); path.context(context); points .forEach((d, i) => { const { lon, lat } = d; const color_prop = color(d); let c = color_prop ? colors[color_prop] : "#fff"; const p = projection([lon, lat]); // This seems to line up const x = p[0] - cellwidth / 2; const y = p[1] - cellheight * 2; context.fillStyle = c; context.strokeStyle = c; context.fillRect(x, y, cellwidth, cellheight); context.strokeRect(x, y, cellwidth, cellheight); }); // Fast clip by overlaying Canada, Mexico and the ocean context.strokeStyle = "white"; context.fillStyle = "white"; canmexGeo.features .forEach((feature, index) => { context.beginPath(); path(feature); context.fill(); context.stroke(); }); oceanGeo.features .forEach((feature, index) => { context.beginPath(); path(feature); context.fill(); context.stroke(); }); // Draw the boundaries on the raster context.beginPath(); path(usGeoInner); context.strokeStyle = "#e9e9e9" context.stroke(); context.beginPath(); path(usGeoOuter); context.strokeStyle = "#d5d5d5" context.stroke(); // Vector layor const svg = wrapper.append("svg") .style("position", "absolute") .attr("width", width) .attr("height", height); // Add legend explaining range outline const legendPolygonWidth = 12; const legendPolygonHeight = 16; const legendPoints = [ [0, 0], [0, legendPolygonHeight / 2], [2, legendPolygonHeight / 2], [2, legendPolygonHeight], [legendPolygonWidth, legendPolygonHeight], [legendPolygonWidth, 0], [0, 0] ]; const legendG = svg.append("g") .attr("transform", `translate(${[width * (rangeKeyLeft(width)), height * (rangeKeyTop(width))]})`); legendG.append("polygon") .attr("fill", "none") .attr("stroke", "black") .attr("points", legendPoints); legendG.append("text") .attr("font-family", franklinLight) .attr("x", legendPolygonWidth + 4) .attr("y", legendPolygonHeight * 0.5 + 5) .text("Typical range"); // Highlight typical growing range with subtle inner glow // See also https://observablehq.com/@veltman/inner-glow path.context(null) const defs = svg.append("defs") defs .append("filter") .attr("id", "blur") .append("feGaussianBlur") .attr("color-interpolation-filters", "sRGB") // for better results in Safari .attr("stdDeviation", 2); defs.append("clipPath") .datum(range) .attr("id", "clip-path") .append("path") .attr("d", path); svg.append("path") .datum(range) .attr("fill", "none") .attr("stroke", "black") .attr("stroke-linejoin", "round") .attr("stroke-opacity", 0.8) .attr("stroke-width", 1) .attr("d", path) svg.append("path") .datum(range) .attr("d", path) .attr("clip-path", "url(#clip-path)") .attr("filter", "url(#blur)") .style("stroke", "black") .style("opacity", 0.8) .style("fill", "none"); const citiesG = svg.selectAll(".city") .data(cities) .join("g") .attr("class", d => `city ${d.pos} ${toSlugCase(d.name)}`) .attr("transform", d => `translate(${projection([d.lon, d.lat])})`); citiesG.append("circle") .attr("r", 3); citiesG.append("text") .attr("class", "bg bg-0") .text(d => d.name); citiesG.append("text") .attr("class", "bg bg-1") .text(d => d.name); citiesG.append("text") .attr("class", "fg") .text(d => d.name); return wrapper.node(); }4a:T5d1,legend = () => html`

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29:{"id":"83c109df753b44a0","slug":null,"title":"Where will trees move in the future?","thumbnail":"6d26383196516b24e602dfe4dd9caa0c20c5b5b65e554d439b4e083e1a50ca0a","access_level":"public","create_time":"$D2023-05-11T21:12:50.973Z","update_time":"$D2023-05-11T21:12:50.973Z","view_time":null,"first_public_time":"$D2023-05-11T21:12:50.973Z","has_unpublished_edits":null,"fork":{"id":"4577a1c213f7aebf","slug":"where-will-trees-move-in-the-future","title":"Where will trees move in the future?","owner":{"id":"650e68a1afc4786b","login":"climatelab","name":"Climate Lab"}},"stars":0,"starred":false,"owner":{"type":"team","id":"351beb92d13c26ca","login":"nistara","name":"Nistara 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the future?","cells":[{"id":0,"value":"# Where will trees move in the future?","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":951,"value":"This notebook contains code to produce a version of the maps seen in [“Trees are moving north from global warming. Look up how your city could change.”](https://www.washingtonpost.com/climate-environment/interactive/2023/tree-species-climate-change-north-shift/), published in The Washington Post on Apr. 26, 2023.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":953,"value":"The list of tree species and their hardiness zones was provided by the Davey Tree Expert Company. Out of curiosity, I added entries for European linden, giant sequoia, Monterey pine, sweetbay magnolia and southern magnolia. 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10)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":406,"value":"// via the U.S. Forest Service https://www.fs.usda.gov/rds/archive/catalog/RDS-2019-0001\n// converted to NetCDF with GDAL\nphz_ccsm45_2039 = FileAttachment(\"PHZ_ccsm45_2039.nc\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":409,"value":"// via the U.S. Forest Service https://www.fs.usda.gov/rds/archive/catalog/RDS-2019-0001\n// converted to NetCDF with GDAL\nphz_ccsm45_2069 = FileAttachment(\"PHZ_ccsm45_2069.nc\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"// via the U.S. Forest Service https://www.fs.usda.gov/rds/archive/catalog/RDS-2019-0001\n// converted to NetCDF with GDAL\nphz_ccsm45_2099 = FileAttachment(\"PHZ_ccsm45_2099.nc\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":12,"value":"nc_ccsm45_2039 = phz_ccsm45_2039\n .arrayBuffer()\n .then((buffer) => new netcdf(buffer))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":496,"value":"nc_ccsm45_2069 = phz_ccsm45_2069\n .arrayBuffer()\n .then((buffer) => new netcdf(buffer))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":498,"value":"nc_ccsm45_2099 = phz_ccsm45_2099\n .arrayBuffer()\n .then((buffer) => new netcdf(buffer))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":16,"value":"values_ccsm45_2039 = nc_ccsm45_2039.getDataVariable(\"Band1\")\n .map(d => d < -60 ? null : d)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":500,"value":"values_ccsm45_2069 = nc_ccsm45_2069.getDataVariable(\"Band1\")\n .map(d => d < -60 ? null : d)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":502,"value":"values_ccsm45_2099 = nc_ccsm45_2099.getDataVariable(\"Band1\")\n .map(d => d < -60 ? null : d)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":23,"value":"lons = nc_ccsm45_2039.getDataVariable(\"lon\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":25,"value":"lats = nc_ccsm45_2039.getDataVariable(\"lat\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":27,"value":"// Combine values from the three time ranges\n// The (lat, lon) pairs have the same indexes in each NetCDF\npoints = values_ccsm45_2039\n .map((c_2039, i) => {\n const lon = lons[i % lons.length];\n const lat = lats[(i / lons.length) | 0];\n const f_2039 = cToF(c_2039);\n\n const c_2069 = values_ccsm45_2069[i];\n const f_2069 = cToF(c_2069);\n\n const c_2099 = values_ccsm45_2099[i];\n const f_2099 = cToF(c_2099);\n \n return {\n lon,\n lat,\n phz_2039: fToPhz(f_2039),\n phz_2069: fToPhz(f_2069),\n phz_2099: fToPhz(f_2099)\n }\n })","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":710,"value":"// Sorted for dropdown menu\ntreesSorted = species.sort((a, b) => d3.ascending(a.name_common, b.name_common))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":775,"value":"// via the Davey Tree Expert company, filtered to include only species in the continental U.S.\n// As mentioned at the top of this notebook, I added a few species of my own\nspecies = FileAttachment(\"species@1.json\").json()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":96,"value":"md`## Utilities`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":279,"value":"// Function to convert Fahrenheit to PHZ\nfunction fToPhz(f) {\n if (isNaN(f) || f === null || (f !== 0 && !f)) return undefined;\n \n if (f < phzs[0]) return 0;\n\n const l = phzs.length;\n \n if (f >= phzs[l - 1]) return l - 1;\n \n for (let i = 0; i < l; i++){\n const v0 = phzs[i];\n const v1 = phzs[i + 1];\n \n // PHZ is [v0, v1)\n if (f >= v0 && f < v1) {\n return i + 1;\n break;\n }\n }\n\n return undefined;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":454,"value":"// Function to convert Celsius to Fahrenheit\nfunction cToF(c) {\n return (isNaN(c) || c === null || (c !== 0 && !c)) ? undefined : c * 9 / 5 + 32;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":99,"value":"// Function to convert a string to slug case\nfunction toSlugCase(x) {\n return x.toString().toLowerCase()\n .replace(/\\s+/g, \"-\") // Replace spaces with -\n .replace(/[^\\w\\-]+/g, \"\") // Remove all non-word chars\n .replace(/\\-\\-+/g, \"-\") // Replace multiple - with single -\n .replace(/^-+/, \"\") // Trim - from start of text\n .replace(/-+$/, \"\"); // Trim - from end of text\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":7,"value":"md`## Imports`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":981,"value":"import { toc } from \"@harrystevens/toc\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":69,"value":"import { franklinLight } from \"1dec0e3505bd3624\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":10,"value":"netcdf = import(\"https://cdn.skypack.dev/netcdfjs@2.0.2?min\").then((d) => d.NetCDFReader)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W4c","stdlib":"1"}} 24:null