2d:null 2e:["$","title",null,{"children":"Box Blur, NetCDF, and Radar Data | Corey Guastini | Observable"}] 33:T52d,{ const context = DOM.context2d(values.x.length, values.y.length); context.canvas.width=values.x.length; context.canvas.height=values.y.length; const context2 = DOM.context2d(values.x.length, values.y.length); context2.canvas.width=values.x.length; context2.canvas.height=values.y.length; context2.canvas.style.width = values.x.length*1.5+"px"; context2.canvas.style.height = values.y.length*1.5+"px"; //yield context.canvas; const target = context.getImageData(0, 0, values.x.length, values.y.length); const targetData = target.data; for (let i = 0; i`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":277,"value":"md`By smoothing, the 45 dBZ contour takes on a textbook appearance down to a well-defined flanking line associated with the rear flank downdraft. The idealized supercell schematic below is from [UCAR](https://courses.comet.ucar.edu/pluginfile.php/3757/mod_imscp/content/1/classic.html).`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":274,"value":"{\n let img = new Image();\n img.src='https://courses.comet.ucar.edu/pluginfile.php/3757/mod_imscp/content/1/HailSpikesFigure8.jpg'\n return img;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":263,"value":"md`## Code Cells`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":126,"value":"$34","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":200,"value":"path = d3.geoPath(d3.geoIdentity().scale(1.5));","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":216,"value":"pathg = {\n const svg = d3.select(\"#contours\");\n \n const g = svg.append(\"g\")\n .attr(\"fill\",\"none\")\n .attr(\"stroke\", \"black\")\n .attr(\"stroke-linejoin\",\"round\")\n .attr(\"stroke-width\", 3);\n return g;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":205,"value":"{\n pathg\n .selectAll(\"path\").data(contour)\n .join(\"path\")\n .attr(\"d\",d=>path(d)) \n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":198,"value":"contour = {\n // Compute the contour polygons at log-spaced intervals; returns an array of MultiPolygon.\n var contours = d3.contours()\n .size([values.x.length, values.y.length])\n .thresholds([45])\n (smoothed);\n return contours;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":110,"value":"smoothed = {\n let width = values.x.length;\n let height = values.y.length;\n let smoothed = values.values.slice(0,values.values.length);\n for (let i=0; i .svgClass { \nbackground: #ebebeb; \nwidth:${values.x.length*1.5}px;\nheight:${values.y.length*1.5}px;\ndisplay:inline-block;\nvertical-align:top;\n} `","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":21,"value":"d3 = require(\"d3@6\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"netcdf = require('https://unpkg.com/netcdfjs@0.3.1/dist/netcdfjs.min.js')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W35","stdlib":"1","titling":"auto"}} 32:"$31:body"