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@rveciana /.block
Last active Aug 10, 2018

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Drawing wind barbs with D3js from a GeoTIFF
license: mit

This example is an experiment to draw wind barbs using d3js and Canvas.

The data is from a sample WRF model, reprojected from Lambert Conformal to latlon so it can be drawn.

The wind speed is plotted under the barbs, using the d3-marching-squares library.

!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(e.rastertools=e.rastertools||{})}(this,function(e){"use strict";function t(e,t,o){return(e-t)/(o-t)}function o(e){for(var t=[],o=e.rows,r=e.cols,l=[],h=0;h<o;h++)for(var a=0;a<r;a++)if("undefined"!=typeof e.cells[h][a]&&e.cells[h][a].edges.length>0){var n=e.cells[h][a],f=(n.cval,p(n)),i=null,c=a,b=h;null!==f&&l.push([f.p[0]+c,f.p[1]+b]);do{if(i=u(e.cells[b][c],f.x,f.y,f.o),null===i)break;if(l.push([i.p[0]+c,i.p[1]+b]),c+=i.x,b+=i.y,f=i,b<0||b>=o||c<0||c>=r||"undefined"==typeof e.cells[b][c]){c-=i.x,b-=i.y;var g=s(e,c,b,i.x,i.y,i.o);if(null===g)break;g.path.forEach(function(e){l.push(e)}),c=g.i,b=g.j,f=g}}while("undefined"!=typeof e.cells[b][c]&&e.cells[b][c].edges.length>0);t.push(l),l=[],e.cells[h][a].edges.length>0&&a--}return t}function s(e,t,o,s,r,p){for(var u=e.cells[o][t],l=u.cval_real,h=t+s,a=o+r,n=[],f=(e.rows,e.cols,!1);!f;){if("undefined"==typeof e.cells[a]||"undefined"==typeof e.cells[a][h])if(a-=r,h-=s,u=e.cells[a][h],l=u.cval_real,r===-1)if(0===p)if(l&w)n.push([h,a]),s=-1,r=0,p=0;else{if(!(l&x)){n.push([h+u.bottomright,a]),s=0,r=1,p=1,f=!0;break}n.push([h+1,a]),s=1,r=0,p=0}else{if(!(l&w)){if(l&x){n.push([h+u.bottomright,a]),s=0,r=1,p=1,f=!0;break}n.push([h+u.bottomleft,a]),s=0,r=1,p=0,f=!0;break}n.push([h,a]),s=-1,r=0,p=0}else if(1===r)if(0===p){if(!(l&k)){if(l&v){n.push([h+u.topleft,a+1]),s=0,r=-1,p=0,f=!0;break}n.push([h+u.topright,a+1]),s=0,r=-1,p=1,f=!0;break}n.push([h+1,a+1]),s=1,r=0,p=1}else l&k?(n.push([h+1,a+1]),s=1,r=0,p=1):(n.push([h+1,a+1]),s=1,r=0,p=1);else if(s===-1)if(0===p){if(!(l&v)){if(l&w){n.push([h,a+u.leftbottom]),s=1,r=0,p=0,f=!0;break}n.push([h,a+u.lefttop]),s=1,r=0,p=1,f=!0;break}n.push([h,a+1]),s=0,r=1,p=0}else{if(!(l&v)){console.log("wtf");break}n.push([h,a+1]),s=0,r=1,p=0}else{if(1!==s){console.log("we came from nowhere!");break}if(0===p){if(!(l&x)){n.push([h+1,a+u.rightbottom]),s=-1,r=0,p=0,f=!0;break}n.push([h+1,a]),s=0,r=-1,p=1}else{if(!(l&x)){if(l&k){n.push([h+1,a+u.righttop]),s=-1,r=0,p=1;break}n.push([h+1,a+u.rightbottom]),s=-1,r=0,p=0,f=!0;break}n.push([h+1,a]),s=0,r=-1,p=1}}else if(u=e.cells[a][h],l=u.cval_real,s===-1)if(0===p)if("undefined"!=typeof e.cells[a-1]&&"undefined"!=typeof e.cells[a-1][h])s=0,r=-1,p=1;else{if(!(l&w)){n.push([h+u.bottomright,a]),s=0,r=1,p=1,f=!0;break}n.push([h,a])}else{if(!(l&v)){console.log("found entry from top at "+h+","+a);break}console.log("proceeding in x-direction!")}else if(1===s){if(0===p){console.log("wtf");break}if("undefined"!=typeof e.cells[a+1]&&"undefined"!=typeof e.cells[a+1][h])s=0,r=1,p=0;else{if(!(l&k)){n.push([h+u.topleft,a+1]),s=0,r=-1,p=0,f=!0;break}n.push([h+1,a+1]),s=1,r=0,p=1}}else if(r===-1){if(1!==p){console.log("wtf");break}if("undefined"!=typeof e.cells[a][h+1])s=1,r=0,p=1;else{if(!(l&x)){n.push([h+1,a+u.righttop]),s=-1,r=0,p=1,f=!0;break}n.push([h+1,a]),s=0,r=-1,p=1}}else{if(1!==r){console.log("where did we came from???");break}if(0!==p){console.log("wtf");break}if("undefined"!=typeof e.cells[a][h-1])s=-1,r=0,p=0;else{if(!(l&v)){n.push([h,a+u.leftbottom]),s=1,r=0,p=0,f=!0;break}n.push([h,a+1]),s=0,r=1,p=0}}if(h+=s,a+=r,h===t&&a===o)break}return{path:n,i:h,j:a,x:s,y:r,o:p}}function r(e,t){delete e.edges[t];for(var o=t+1;o<e.edges.length;o++)e.edges[o-1]=e.edges[o];e.edges.pop()}function p(e){if(e.edges.length>0){var t=e.edges[e.edges.length-1],o=e.cval_real;switch(t){case 0:return o&k?{p:[1,e.righttop],x:-1,y:0,o:1}:{p:[e.topleft,1],x:0,y:-1,o:0};case 1:return o&x?{p:[e.topleft,1],x:0,y:-1,o:0}:{p:[1,e.rightbottom],x:-1,y:0,o:0};case 2:return o&x?{p:[e.bottomright,0],x:0,y:1,o:1}:{p:[e.topleft,1],x:0,y:-1,o:0};case 3:return o&w?{p:[e.topleft,1],x:0,y:-1,o:0}:{p:[e.bottomleft,0],x:0,y:1,o:0};case 4:return o&k?{p:[1,e.righttop],x:-1,y:0,o:1}:{p:[e.topright,1],x:0,y:-1,o:1};case 5:return o&x?{p:[e.topright,1],x:0,y:-1,o:1}:{p:[1,e.rightbottom],x:-1,y:0,o:0};case 6:return o&x?{p:[e.bottomright,0],x:0,y:1,o:1}:{p:[e.topright,1],x:0,y:-1,o:1};case 7:return o&w?{p:[e.topright,1],x:0,y:-1,o:1}:{p:[e.bottomleft,0],x:0,y:1,o:0};case 8:return o&x?{p:[e.bottomright],x:0,y:1,o:1}:{p:[1,e.righttop],x:-1,y:0,o:1};case 9:return o&w?{p:[1,e.righttop],x:-1,y:0,o:1}:{p:[e.bottomleft,0],x:0,y:1,o:0};case 10:return o&w?{p:[0,e.leftbottom],x:1,y:0,o:0}:{p:[1,e.righttop],x:-1,y:0,o:1};case 11:return o&v?{p:[1,e.righttop],x:-1,y:0,o:1}:{p:[0,e.lefttop],x:1,y:0,o:1};case 12:return o&x?{p:[e.bottomright,0],x:0,y:1,o:1}:{p:[1,e.rightbottom],x:-1,y:0,o:0};case 13:return o&w?{p:[1,e.rightbottom],x:-1,y:0,o:0}:{p:[e.bottomleft,0],x:0,y:1,o:0};case 14:return o&w?{p:[0,e.leftbottom],x:1,y:0,o:0}:{p:[1,e.rightbottom],x:-1,y:0,o:0};case 15:return o&v?{p:[1,e.rightbottom],x:-1,y:0,o:0}:{p:[0,e.lefttop],x:1,y:0,o:1};case 16:return o&x?{p:[e.bottomright,0],x:0,y:1,o:1}:{p:[0,e.leftbottom],x:1,y:0,o:0};case 17:return o&v?{p:[e.bottomright,0],x:0,y:1,o:1}:{p:[0,e.lefttop],x:1,y:0,o:1};case 18:return o&w?{p:[0,e.leftbottom],x:1,y:0,o:0}:{p:[e.bottomleft,0],x:0,y:1,o:0};case 19:return o&v?{p:[e.bottomleft,0],x:0,y:1,o:0}:{p:[0,e.lefttop],x:1,y:0,o:1};case 20:return o&v?{p:[e.topleft,1],x:0,y:-1,o:0}:{p:[0,e.leftbottom],x:1,y:0,o:0};case 21:return o&k?{p:[0,e.leftbottom],x:1,y:0,o:0}:{p:[e.topright,1],x:0,y:-1,o:1};case 22:return o&v?{p:[e.topleft,1],x:0,y:-1,o:0}:{p:[0,e.lefttop],x:1,y:0,o:1};case 23:return o&k?{p:[0,e.lefttop],x:1,y:0,o:1}:{p:[e.topright,1],x:0,y:-1,o:1};default:console.log("edge index out of range!"),console.log(e)}}return null}function u(e,t,o,s){var p,u,t,o,l,h,a,n=e.cval;switch(t){case-1:switch(s){case 0:p=U[n],l=A[n],h=G[n],a=P[n];break;default:p=R[n],l=F[n],h=O[n],a=I[n]}break;case 1:switch(s){case 0:p=Y[n],l=J[n],h=K[n],a=Q[n];break;default:p=Z[n],l=B[n],h=D[n],a=H[n]}break;default:switch(o){case-1:switch(s){case 0:p=$[n],l=N[n],h=C[n],a=j[n];break;default:p=ee[n],l=_[n],h=E[n],a=M[n]}break;case 1:switch(s){case 0:p=X[n],l=T[n],h=V[n],a=L[n];break;default:p=W[n],l=S[n],h=q[n],a=z[n]}}}if(u=e.edges.indexOf(p),"undefined"==typeof e.edges[u])return null;switch(r(e,u),n=e.cval_real,p){case 0:n&k?(t=e.topleft,o=1):(t=1,o=e.righttop);break;case 1:n&x?(t=1,o=e.rightbottom):(t=e.topleft,o=1);break;case 2:n&x?(t=e.topleft,o=1):(t=e.bottomright,o=0);break;case 3:n&w?(t=e.bottomleft,o=0):(t=e.topleft,o=1);break;case 4:n&k?(t=e.topright,o=1):(t=1,o=e.righttop);break;case 5:n&x?(t=1,o=e.rightbottom):(t=e.topright,o=1);break;case 6:n&x?(t=e.topright,o=1):(t=e.bottomright,o=0);break;case 7:n&w?(t=e.bottomleft,o=0):(t=e.topright,o=1);break;case 8:n&x?(t=1,o=e.righttop):(t=e.bottomright,o=0);break;case 9:n&w?(t=e.bottomleft,o=0):(t=1,o=e.righttop);break;case 10:n&w?(t=1,o=e.righttop):(t=0,o=e.leftbottom);break;case 11:n&v?(t=0,o=e.lefttop):(t=1,o=e.righttop);break;case 12:n&x?(t=1,o=e.rightbottom):(t=e.bottomright,o=0);break;case 13:n&w?(t=e.bottomleft,o=0):(t=1,o=e.rightbottom);break;case 14:n&w?(t=1,o=e.rightbottom):(t=0,o=e.leftbottom);break;case 15:n&v?(t=0,o=e.lefttop):(t=1,o=e.rightbottom);break;case 16:n&x?(t=0,o=e.leftbottom):(t=e.bottomright,o=0);break;case 17:n&v?(t=0,o=e.lefttop):(t=e.bottomright,o=0);break;case 18:n&w?(t=e.bottomleft,o=0):(t=0,o=e.leftbottom);break;case 19:n&v?(t=0,o=e.lefttop):(t=e.bottomleft,o=0);break;case 20:n&v?(t=0,o=e.leftbottom):(t=e.topleft,o=1);break;case 21:n&k?(t=e.topright,o=1):(t=0,o=e.leftbottom);break;case 22:n&v?(t=0,o=e.lefttop):(t=e.topleft,o=1);break;case 23:n&k?(t=e.topright,o=1):(t=0,o=e.lefttop);break;default:return console.log("edge index out of range!"),console.log(e),null}return"undefined"!=typeof t&&"undefined"!=typeof o&&"undefined"!=typeof l&&"undefined"!=typeof h&&"undefined"!=typeof a||(console.log("undefined value!"),console.log(e),console.log(t+" "+o+" "+l+" "+h+" "+a)),{p:[t,o],x:l,y:h,o:a}}function l(e,t,o){return(e-t)/(o-t)}function h(e,t){for(var o=e.length-1,s=e[0].length-1,r={rows:o,cols:s,cells:[]},p=0;p<o;++p){r.cells[p]=[];for(var u=0;u<s;++u){var h=0,a=e[p+1][u],n=e[p+1][u+1],f=e[p][u+1],i=e[p][u];if(!(isNaN(a)||isNaN(n)||isNaN(f)||isNaN(i))){h|=a>=t?8:0,h|=n>=t?4:0,h|=f>=t?2:0,h|=i>=t?1:0;var c=!1;if(5==h||10==h){var b=(a+n+f+i)/4;5==h&&b<t?(h=10,c=!0):10==h&&b<t&&(h=5,c=!0)}if(0!=h&&15!=h){var g,d,y,m;g=d=y=m=.5,1==h?(y=1-l(t,a,i),d=1-l(t,f,i)):2==h?(d=l(t,i,f),m=1-l(t,n,f)):3==h?(y=1-l(t,a,i),m=1-l(t,n,f)):4==h?(g=l(t,a,n),m=l(t,f,n)):5==h?(g=l(t,a,n),m=l(t,f,n),d=1-l(t,f,i),y=1-l(t,a,i)):6==h?(d=l(t,i,f),g=l(t,a,n)):7==h?(y=1-l(t,a,i),g=l(t,a,n)):8==h?(y=l(t,i,a),g=1-l(t,n,a)):9==h?(d=1-l(t,f,i),g=1-l(t,n,a)):10==h?(g=1-l(t,n,a),m=1-l(t,n,f),d=l(t,i,f),y=l(t,i,a)):11==h?(g=1-l(t,n,a),m=1-l(t,n,f)):12==h?(y=l(t,i,a),m=l(t,f,n)):13==h?(d=1-l(t,f,i),m=l(t,f,n)):14==h?(y=l(t,i,a),d=l(t,i,f)):console.log("Illegal cval detected: "+h),r.cells[p][u]={cval:h,flipped:c,top:g,right:m,bottom:d,left:y}}}}}return r}function a(e){return 5==e.cval||10==e.cval}function n(e){return 0==e.cval||15==e.cval}function f(e){n(e)||5==e.cval||10==e.cval||(e.cval=15)}function i(e,t){return"top"===t?[e.top,1]:"bottom"===t?[e.bottom,0]:"right"===t?[1,e.right]:"left"===t?[0,e.left]:void 0}function c(e){var t=[],o=0,s=(e.rows,e.cols,1e-7);return 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b);){if(g=b.cval,0==g||15==g)return{path:l,info:"mergeable"};p=c[g],s=h[g],r=a[g],5!=g&&10!=g||(5==g?b.flipped?a[v]==-1?(p="left",s=-1,r=0):(p="right",s=1,r=0):h[v]==-1&&(p="bottom",s=0,r=-1):10==g&&(b.flipped?h[v]==-1?(p="top",s=0,r=1):(p="bottom",s=0,r=-1):1==a[v]&&(p="left",s=-1,r=0))),d=i(b,p),l.push([y+d[0],m+d[1]]),f(b),y+=s,m+=r,v=g}return{path:l,info:"closed"}}var g=function(e,t,o){for(var s={type:"FeatureCollection",features:[]},r=1;r<o.length;r++){for(var p=o[r-1],u=o[r],l=d(e,t,p,u-p),h=0;h<l.length;h++)l[h].reverse();s.features.push({type:"Feature",geometry:{type:"Polygon",coordinates:l},properties:[{lowerValue:p,upperValue:u}]})}return s},d=function(e,t,o,s){if(typeof t!=typeof new Array||6!=t.length)throw new Error("GeoTransform must be a 6 elements array");for(var r=m(e,o,s),p=0;p<r.length;p++)for(var u=0;u<r[p].length;u++){var l=y(r[p][u][0],r[p][u][1],t);r[p][u][0]=l[0],r[p][u][1]=l[1]}return r},y=function(e,t,o){var s=o[0]+e*o[1]+t*o[2],r=o[3]+e*o[4]+t*o[5];return[s,r]},m=function(e,t,s,r){var p={},u={successCallback:null,progressCallback:null,verbose:!1};r=r?r:{};for(var l=Object.keys(u),h=0;h<l.length;h++){var a=l[h],n=r[a];n="undefined"!=typeof n&&null!==n?n:u[a],p[a]=n}p.verbose&&console.log("computing isobands for ["+t+":"+(t+s)+"]");var f=te(e,t,s);p.verbose&&(p.polygons?console.log("returning single polygons for each grid cell"):console.log("returning polygon paths for entire data grid"));var i=o(f);return"function"==typeof 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