https://trailmaps.app/dte/vendor/maplibre-contour.js

1!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).mlcontour=e()}(this,(function(){"use strict";var t,e,i;function r(r,s){if(t)if(e){var n="var sharedChunk = {}; ("+t+")(sharedChunk); ("+e+")(sharedChunk);",o={};t(o),i=s(o),"undefined"!=typeof window&&(i.workerUrl=window.URL.createObjectURL(new Blob([n],{type:"text/javascript"})))}else e=s;else t=s}return r(0,(function(t){class e{constructor(t,e){this.start=t,this.end=e,this.points=[],this.append=this.append.bind(this),this.prepend=this.prepend.bind(this)}append(t,e){this.points.push(Math.round(t),Math.round(e))}prepend(t,e){this.points.splice(0,0,Math.round(t),Math.round(e))}lineString(){return this.toArray()}isEmpty(){return this.points.length<2}appendFragment(t){this.points.push(...t.points),this.end=t.end}toArray(){return this.points}}const i=[[],[[[1,2],[0,1]]],[[[2,1],[1,2]]],[[[2,1],[0,1]]],[[[1,0],[2,1]]],[[[1,2],[0,1]],[[1,0],[2,1]]],[[[1,0],[1,2]]],[[[1,0],[0,1]]],[[[0,1],[1,0]]],[[[1,2],[1,0]]],[[[0,1],[1,0]],[[2,1],[1,2]]],[[[2,1],[1,0]]],[[[0,1],[2,1]]],[[[1,2],[2,1]]],[[[0,1],[1,2]]],[]];function r(t,e,i,r){return(e=2*e+r[0])+(i=2*i+r[1])*(t+1)*2}function s(t,e,i){return(e-t)/(i-t)}function n(t,n,o=4096,a=1){if(!t)return{};const h=o/(n.width-1);let l,c,d,u,f,p;const w={},g=new Map,m=new Map;function b(t,e,i){0===t[0]?i(h*(p-1),h*(f-s(d,e,l))):2===t[0]?i(h*p,h*(f-s(u,e,c))):0===t[1]?i(h*(p-s(c,e,l)),h*(f-1)):i(h*(p-s(u,e,d)),h*f)}for(f=1-a;f<n.height+a;f++){c=n.get(0,f-1),u=n.get(0,f);let s=Math.min(c,u),o=Math.max(c,u);for(p=1-a;p<n.width+a;p++){l=c,d=u,c=n.get(p,f-1),u=n.get(p,f);const a=s,h=o;if(s=Math.min(c,u),o=Math.max(c,u),isNaN(l)||isNaN(c)||isNaN(u)||isNaN(d))continue;const y=Math.min(a,s),v=Math.max(h,o),x=Math.ceil(y/t)*t,P=Math.floor(v/t)*t;for(let s=x;s<=P;s+=t){const t=l>s,o=c>s,a=d>s,h=u>s;for(const l of i[(t?8:0)|(o?4:0)|(h?2:0)|(a?1:0)]){let t=g.get(s);t||g.set(s,t=new Map);let i=m.get(s);i||m.set(s,i=new Map);const o=l[0],a=l[1],h=r(n.width,p,f,o),c=r(n.width,p,f,a);let d,u;if(d=i.get(h))if(i.delete(h),u=t.get(c))if(t.delete(c),d===u){if(b(a,s,d.append),!d.isEmpty()){let t=w[s];t||(w[s]=t=[]),t.push(d.lineString())}}else d.appendFragment(u),i.set(d.end=u.end,d);else b(a,s,d.append),i.set(d.end=c,d);else if(d=t.get(c))t.delete(c),b(o,s,d.prepend),t.set(d.start=h,d);else{const r=new e(h,c);b(o,s,r.append),b(a,s,r.append),t.set(h,r),i.set(c,r)}}}}}for(const[t,e]of g.entries()){let i=null;for(const r of e.values())r.isEmpty()||(null==i&&(i=w[t]||(w[t]=[])),i.push(r.lineString()))}return w}
2/*! *****************************************************************************
3    Copyright (c) Microsoft Corporation.
4
5    Permission to use, copy, modify, and/or distribute this software for any
6    purpose with or without fee is hereby granted.
7
8    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
9    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
11    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
13    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14    PERFORMANCE OF THIS SOFTWARE.
15    ***************************************************************************** */function o(t,e){var i={};for(var r in t)Object.prototype.hasOwnProperty.call(t,r)&&e.indexOf(r)<0&&(i[r]=t[r]);if(null!=t&&"function"==typeof Object.getOwnPropertySymbols){var s=0;for(r=Object.getOwnPropertySymbols(t);s<r.length;s++)e.indexOf(r[s])<0&&Object.prototype.propertyIsEnumerable.call(t,r[s])&&(i[r[s]]=t[r[s]])}return i}function a(t,e,i,r){return new(i||(i=Promise))((function(s,n){function o(t){try{h(r.next(t))}catch(t){n(t)}}function a(t){try{h(r.throw(t))}catch(t){n(t)}}function h(t){var e;t.done?s(t.value):(e=t.value,e instanceof i?e:new i((function(t){t(e)}))).then(o,a)}h((r=r.apply(t,e||[])).next())}))}function h(t){const e=Object.entries(t);return e.sort((([t],[e])=>t<e?-1:t>e?1:0)),e}function l(t){return h(t).map((([t,e])=>[t,..."number"==typeof e?[e]:e].join("*"))).join("~")}function c(t){return h(t).map((([t,e])=>`${encodeURIComponent(t)}=${encodeURIComponent(e)}`)).join(",")}function d(t){const e=new ArrayBuffer(t.byteLength);return new Uint8Array(e).set(new Uint8Array(t)),e}let u=null;function f(){return null==u&&(u="undefined"!=typeof OffscreenCanvas&&new OffscreenCanvas(1,1).getContext("2d")&&"function"==typeof createImageBitmap),u||!1}let p=null;function w(t,e,i){let r=()=>{};const s=setTimeout((()=>{r(new Error("timed out")),null==i||i.abort()}),t);g(i,(()=>{r(new Error("aborted")),clearTimeout(s)}));const n=new Promise(((t,e)=>{r=e}));return Promise.race([n,e.finally((()=>clearTimeout(s)))])}function g(t,e){e&&(null==t||t.signal.addEventListener("abort",e))}function m(t){var e;return Boolean(null===(e=null==t?void 0:t.signal)||void 0===e?void 0:e.aborted)}let b,y,v,x,P=0;class F{constructor(t=100){this.size=()=>this.items.size,this.get=(t,e,i)=>{let r=this.items.get(t);if(r)r.lastUsed=++P,r.waiting++;else{const i=new AbortController,s=e(t,i);r={abortController:i,item:s,lastUsed:++P,waiting:1},this.items.set(t,r),this.prune()}const s=this.items,n=r.item.then((t=>t),(e=>(s.delete(t),Promise.reject(e))));let o=!1;return g(i,(()=>{var e;r&&r.abortController&&!o&&(o=!0,--r.waiting<=0&&(null===(e=r.abortController)||void 0===e||e.abort(),s.delete(t)))})),n},this.clear=()=>this.items.clear(),this.maxSize=t,this.items=new Map}

15prune(){if(this.items.size>this.maxSize){let t,e=1/0;this.items.forEach(((i,r)=>{i.lastUsed<e&&(e=i.lastUsed,t=r)})),void 0!==t&&this.items.delete(t)}}}function k(t,e){return b||(b=new OffscreenCanvas(t.width,t.height),y=b.getContext("2d",{willReadFrequently:!0})),M(t,e,b,y)}const V=function(){if(null==p&&(p=!1,f()&&"undefined"!=typeof VideoFrame)){const t=5,e=new OffscreenCanvas(5,5).getContext("2d",{willReadFrequently:!0});if(e){for(let i=0;i<t*t;i++){const r=4*i;e.fillStyle=`rgb(${r},${r+1},${r+2})`,e.fillRect(i%t,Math.floor(i/t),1,1)}const i=e.getImageData(0,0,t,t).data;for(let e=0;e<t*t*4;e++)if(e%4!=3&&i[e]!==e){p=!0;break}}}return p||!1}()?function(t,e,i){return a(this,void 0,void 0,(function*(){var r,s,n;const o=yield createImageBitmap(t);if(m(i))return null;const a=new VideoFrame(o,{timestamp:0});try{if(!((null===(r=null==a?void 0:a.format)||void 0===r?void 0:r.startsWith("BGR"))||(null===(s=null==a?void 0:a.format)||void 0===s?void 0:s.startsWith("RGB"))))throw new Error(`Unrecognized format: ${null==a?void 0:a.format}`);const t=null===(n=null==a?void 0:a.format)||void 0===n?void 0:n.startsWith("BGR"),i=a.allocationSize(),h=new Uint8ClampedArray(i);if(yield a.copyTo(h),t)for(let t=0;t<h.length;t+=4){const e=h[t];h[t]=h[t+2],h[t+2]=e}return S(o.width,o.height,e,h)}catch(t){return m(i)?null:k(o,e)}finally{a.close()}}))}:f()?function(t,e,i){return a(this,void 0,void 0,(function*(){const r=yield createImageBitmap(t);return m(i)?null:k(r,e)}))}:"undefined"!=typeof WorkerGlobalScope&&"undefined"!=typeof self&&self instanceof WorkerGlobalScope?function(t,e,i){return self.actor.send("decodeImage",[],i,void 0,t,e)}:function(t,e,i){return a(this,void 0,void 0,(function*(){v||(v=document.createElement("canvas"),x=v.getContext("2d",{willReadFrequently:!0}));const r=new Image;g(i,(()=>r.src=""));return M(yield new Promise(((e,s)=>{r.onload=()=>{m(i)||e(r),URL.revokeObjectURL(r.src),r.onload=null},r.onerror=()=>s(new Error("Could not load image.")),r.src=t.size?URL.createObjectURL(t):""})),e,v,x)}))};function M(t,e,i,r){if(i.width=t.width,i.height=t.height,!r)throw new Error("failed to get context");r.drawImage(t,0,0,t.width,t.height);const s=r.getImageData(0,0,t.width,t.height).data;return S(t.width,t.height,e,s)}function S(t,e,i,r){const s="mapbox"===i?(t,e,i)=>.1*(256*t*256+256*e+i)-1e4:(t,e,i)=>256*t+e+i/256-32768,n=new Float32Array(t*e);for(let t=0;t<r.length;t+=4)n[t/4]=s(r[t],r[t+1],r[t+2]);return{width:t,height:e,data:n}}class T{constructor(t,e,i){this.split=(t,e,i)=>{if(0===t)return this;const r=1<<t,s=e*this.width/r,n=i*this.height/r;return new T(this.width/r,this.height/r,((t,e)=>this.get(t+s,e+n)))},this.subsamplePixelCenters=t=>{const e=(t,e,i)=>isNaN(t)?e:isNaN(e)?t:t+(e-t)*i;if(t<=1)return this;const i=.5-1/(2*t);return new T(this.width*t,this.height*t,((r,s)=>{const n=r/t-i,o=s/t-i,a=Math.floor(n),h=Math.floor(o),l=this.get(a,h),c=this.get(a+1,h),d=this.get(a,h+1),u=this.get(a+1,h+1),f=n-a,p=o-h,w=e(l,c,f),g=e(d,u,f);return e(w,g,p)}))},this.averagePixelCentersToGrid=(t=1)=>new T(this.width+1,this.height+1,((e,i)=>{let r=0,s=0,n=0;for(let o=e-t;o<e+t;o++)for(let e=i-t;e<i+t;e++)isNaN(n=this.get(o,e))||(s++,r+=n);return 0===s?NaN:r/s})),this.scaleElevation=t=>1===t?this:new T(this.width,this.height,((e,i)=>this.get(e,i)*t)),this.materialize=(t=2)=>{const e=this.width+2*t,i=new Float32Array(e*(this.height+2*t));let r=0;for(let e=-t;e<this.height+t;e++)for(let s=-t;s<this.width+t;s++)i[r++]=this.get(s,e);return new T(this.width,this.height,((r,s)=>i[(s+t)*e+r+t]))},this.get=i,this.width=t,this.height=e}static fromRawDem(t){return new T(t.width,t.height,((e,i)=>{const r=t.data[i*t.width+e];return s=r,!isNaN(s)&&s>=-12e3&&s<=9e3?r:NaN;var s}))}

15static combineNeighbors(t){if(9!==t.length)throw new Error("Must include a tile plus 8 neighbors");const e=t[4];if(!e)return;const i=e.width,r=e.height;return new T(i,r,((e,s)=>{let n=0;s<0?s+=r:s<r?n+=3:(s-=r,n+=6),e<0?e+=i:e<i?n+=1:(e-=i,n+=2);const o=t[n];return o?o.get(e,s):NaN}))}}const N=4294967296,C=1/N,O="undefined"==typeof TextDecoder?null:new TextDecoder("utf-8");class I{constructor(t=new Uint8Array(16)){this.buf=ArrayBuffer.isView(t)?t:new Uint8Array(t),this.dataView=new DataView(this.buf.buffer),this.pos=0,this.type=0,this.length=this.buf.length}readFields(t,e,i=this.length){for(;this.pos<i;){const i=this.readVarint(),r=i>>3,s=this.pos;this.type=7&i,t(r,e,this),this.pos===s&&this.skip(i)}return e}readMessage(t,e){return this.readFields(t,e,this.readVarint()+this.pos)}readFixed32(){const t=this.dataView.getUint32(this.pos,!0);return this.pos+=4,t}readSFixed32(){const t=this.dataView.getInt32(this.pos,!0);return this.pos+=4,t}readFixed64(){const t=this.dataView.getUint32(this.pos,!0)+this.dataView.getUint32(this.pos+4,!0)*N;return this.pos+=8,t}readSFixed64(){const t=this.dataView.getUint32(this.pos,!0)+this.dataView.getInt32(this.pos+4,!0)*N;return this.pos+=8,t}readFloat(){const t=this.dataView.getFloat32(this.pos,!0);return this.pos+=4,t}readDouble(){const t=this.dataView.getFloat64(this.pos,!0);return this.pos+=8,t}readVarint(t){const e=this.buf;let i,r;return r=e[this.pos++],i=127&r,r<128?i:(r=e[this.pos++],i|=(127&r)<<7,r<128?i:(r=e[this.pos++],i|=(127&r)<<14,r<128?i:(r=e[this.pos++],i|=(127&r)<<21,r<128?i:(r=e[this.pos],i|=(15&r)<<28,function(t,e,i){const r=i.buf;let s,n;if(n=r[i.pos++],s=(112&n)>>4,n<128)return E(t,s,e);if(n=r[i.pos++],s|=(127&n)<<3,n<128)return E(t,s,e);if(n=r[i.pos++],s|=(127&n)<<10,n<128)return E(t,s,e);if(n=r[i.pos++],s|=(127&n)<<17,n<128)return E(t,s,e);if(n=r[i.pos++],s|=(127&n)<<24,n<128)return E(t,s,e);if(n=r[i.pos++],s|=(1&n)<<31,n<128)return E(t,s,e);throw new Error("Expected varint not more than 10 bytes")}(i,t,this)))))}readVarint64(){return this.readVarint(!0)}readSVarint(){const t=this.readVarint();return t%2==1?(t+1)/-2:t/2}readBoolean(){return Boolean(this.readVarint())}readString(){const t=this.readVarint()+this.pos,e=this.pos;return this.pos=t,t-e>=12&&O?O.decode(this.buf.subarray(e,t)):function(t,e,i){let r="",s=e;for(;s<i;){const e=t[s];let n,o,a,h=null,l=e>239?4:e>223?3:e>191?2:1;if(s+l>i)break;1===l?e<128&&(h=e):2===l?(n=t[s+1],128==(192&n)&&(h=(31&e)<<6|63&n,h<=127&&(h=null))):3===l?(n=t[s+1],o=t[s+2],128==(192&n)&&128==(192&o)&&(h=(15&e)<<12|(63&n)<<6|63&o,(h<=2047||h>=55296&&h<=57343)&&(h=null))):4===l&&(n=t[s+1],o=t[s+2],a=t[s+3],128==(192&n)&&128==(192&o)&&128==(192&a)&&(h=(15&e)<<18|(63&n)<<12|(63&o)<<6|63&a,(h<=65535||h>=1114112)&&(h=null))),null===h?(h=65533,l=1):h>65535&&(h-=65536,r+=String.fromCharCode(h>>>10&1023|55296),h=56320|1023&h),r+=String.fromCharCode(h),s+=l}return r}(this.buf,e,t)}readBytes(){const t=this.readVarint()+this.pos,e=this.buf.subarray(this.pos,t);return this.pos=t,e}readPackedVarint(t=[],e){const i=this.readPackedEnd();for(;this.pos<i;)t.push(this.readVarint(e));return t}readPackedSVarint(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readSVarint());return t}readPackedBoolean(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readBoolean());return t}readPackedFloat(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readFloat());return t}readPackedDouble(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readDouble());return t}readPackedFixed32(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readFixed32());return t}readPackedSFixed32(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readSFixed32());return t}readPackedFixed64(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readFixed64());return t}readPackedSFixed64(t=[]){const e=this.readPackedEnd();for(;this.pos<e;)t.push(this.readSFixed64());return t}readPackedEnd(){return 2===this.type?this.readVarint()+this.pos:this.pos+1}skip(t){const e=7&t;if(0===e)for(;this.buf[this.pos++]>127;);else if(2===e)this.pos=this.readVarint()+this.pos;else if(5===e)this.pos+=4;else{if(1!==e)throw new Error(`Unimplemented type: ${e}`);this.pos+=8}}writeTag(t,e){this.writeVarint(t<<3|e)}realloc(t){let e=this.length||16;for(;e<this.pos+t;)e*=2;if(e!==this.length){const t=new Uint8Array(e);t.set(this.buf),this.buf=t,this.dataView=new DataView(t.buffer),this.length=e}}finish(){return this.length=this.pos,this.pos=0,this.buf.subarray(0,this.length)}writeFixed32(t){this.realloc(4),this.dataView.setInt32(this.pos,t,!0),this.pos+=4}writeSFixed32(t){this.realloc(4),this.dataView.setInt32(this.pos,t,!0),this.pos+=4}

15writeFixed64(t){this.realloc(8),this.dataView.setInt32(this.pos,-1&t,!0),this.dataView.setInt32(this.pos+4,Math.floor(t*C),!0),this.pos+=8}writeSFixed64(t){this.realloc(8),this.dataView.setInt32(this.pos,-1&t,!0),this.dataView.setInt32(this.pos+4,Math.floor(t*C),!0),this.pos+=8}writeVarint(t){(t=+t||0)>268435455||t<0?function(t,e){let i,r;t>=0?(i=t%4294967296|0,r=t/4294967296|0):(i=~(-t%4294967296),r=~(-t/4294967296),4294967295^i?i=i+1|0:(i=0,r=r+1|0));if(t>=0x10000000000000000||t<-0x10000000000000000)throw new Error("Given varint doesn't fit into 10 bytes");e.realloc(10),function(t,e,i){i.buf[i.pos++]=127&t|128,t>>>=7,i.buf[i.pos++]=127&t|128,t>>>=7,i.buf[i.pos++]=127&t|128,t>>>=7,i.buf[i.pos++]=127&t|128,t>>>=7,i.buf[i.pos]=127&t}(i,0,e),function(t,e){const i=(7&t)<<4;if(e.buf[e.pos++]|=i|((t>>>=3)?128:0),!t)return;if(e.buf[e.pos++]=127&t|((t>>>=7)?128:0),!t)return;if(e.buf[e.pos++]=127&t|((t>>>=7)?128:0),!t)return;if(e.buf[e.pos++]=127&t|((t>>>=7)?128:0),!t)return;if(e.buf[e.pos++]=127&t|((t>>>=7)?128:0),!t)return;e.buf[e.pos++]=127&t}(r,e)}(t,this):(this.realloc(4),this.buf[this.pos++]=127&t|(t>127?128:0),t<=127||(this.buf[this.pos++]=127&(t>>>=7)|(t>127?128:0),t<=127||(this.buf[this.pos++]=127&(t>>>=7)|(t>127?128:0),t<=127||(this.buf[this.pos++]=t>>>7&127))))}writeSVarint(t){this.writeVarint(t<0?2*-t-1:2*t)}writeBoolean(t){this.writeVarint(+t)}writeString(t){t=String(t),this.realloc(4*t.length),this.pos++;const e=this.pos;this.pos=function(t,e,i){for(let r,s,n=0;n<e.length;n++){if(r=e.charCodeAt(n),r>55295&&r<57344){if(!s){r>56319||n+1===e.length?(t[i++]=239,t[i++]=191,t[i++]=189):s=r;continue}if(r<56320){t[i++]=239,t[i++]=191,t[i++]=189,s=r;continue}r=s-55296<<10|r-56320|65536,s=null}else s&&(t[i++]=239,t[i++]=191,t[i++]=189,s=null);r<128?t[i++]=r:(r<2048?t[i++]=r>>6|192:(r<65536?t[i++]=r>>12|224:(t[i++]=r>>18|240,t[i++]=r>>12&63|128),t[i++]=r>>6&63|128),t[i++]=63&r|128)}return i}(this.buf,t,this.pos);const i=this.pos-e;i>=128&&U(e,i,this),this.pos=e-1,this.writeVarint(i),this.pos+=i}writeFloat(t){this.realloc(4),this.dataView.setFloat32(this.pos,t,!0),this.pos+=4}writeDouble(t){this.realloc(8),this.dataView.setFloat64(this.pos,t,!0),this.pos+=8}writeBytes(t){const e=t.length;this.writeVarint(e),this.realloc(e);for(let i=0;i<e;i++)this.buf[this.pos++]=t[i]}writeRawMessage(t,e){this.pos++;const i=this.pos;t(e,this);const r=this.pos-i;r>=128&&U(i,r,this),this.pos=i-1,this.writeVarint(r),this.pos+=r}writeMessage(t,e,i){this.writeTag(t,2),this.writeRawMessage(e,i)}writePackedVarint(t,e){e.length&&this.writeMessage(t,B,e)}writePackedSVarint(t,e){e.length&&this.writeMessage(t,A,e)}writePackedBoolean(t,e){e.length&&this.writeMessage(t,z,e)}writePackedFloat(t,e){e.length&&this.writeMessage(t,D,e)}writePackedDouble(t,e){e.length&&this.writeMessage(t,j,e)}writePackedFixed32(t,e){e.length&&this.writeMessage(t,R,e)}writePackedSFixed32(t,e){e.length&&this.writeMessage(t,$,e)}writePackedFixed64(t,e){e.length&&this.writeMessage(t,L,e)}writePackedSFixed64(t,e){e.length&&this.writeMessage(t,G,e)}writeBytesField(t,e){this.writeTag(t,2),this.writeBytes(e)}writeFixed32Field(t,e){this.writeTag(t,5),this.writeFixed32(e)}writeSFixed32Field(t,e){this.writeTag(t,5),this.writeSFixed32(e)}writeFixed64Field(t,e){this.writeTag(t,1),this.writeFixed64(e)}writeSFixed64Field(t,e){this.writeTag(t,1),this.writeSFixed64(e)}writeVarintField(t,e){this.writeTag(t,0),this.writeVarint(e)}writeSVarintField(t,e){this.writeTag(t,0),this.writeSVarint(e)}writeStringField(t,e){this.writeTag(t,2),this.writeString(e)}writeFloatField(t,e){this.writeTag(t,5),this.writeFloat(e)}writeDoubleField(t,e){this.writeTag(t,1),this.writeDouble(e)}writeBooleanField(t,e){this.writeVarintField(t,+e)}}function E(t,e,i){return i?4294967296*e+(t>>>0):4294967296*(e>>>0)+(t>>>0)}function U(t,e,i){const r=e<=16383?1:e<=2097151?2:e<=268435455?3:Math.floor(Math.log(e)/(7*Math.LN2));i.realloc(r);for(let e=i.pos-1;e>=t;e--)i.buf[e+r]=i.buf[e]}function B(t,e){for(let i=0;i<t.length;i++)e.writeVarint(t[i])}function A(t,e){for(let i=0;i<t.length;i++)e.writeSVarint(t[i])}function D(t,e){for(let i=0;i<t.length;i++)e.writeFloat(t[i])}function j(t,e){for(let i=0;i<t.length;i++)e.writeDouble(t[i])}function z(t,e){for(let i=0;i<t.length;i++)e.writeBoolean(t[i])}function R(t,e){for(let i=0;i<t.length;i++)e.writeFixed32(t[i])}function $(t,e){for(let i=0;i<t.length;i++)e.writeSFixed32(t[i])}function L(t,e){for(let i=0;i<t.length;

15i++)e.writeFixed64(t[i])}function G(t,e){for(let i=0;i<t.length;i++)e.writeSFixed64(t[i])}var W;function q(t,e){if(!e)throw new Error("pbf undefined");e.writeStringField(1,t.id||"");const i={keys:[],values:[],keycache:{},valuecache:{}};for(const r of t.features)i.feature=r,e.writeMessage(2,K,i);for(const t of i.keys)e.writeStringField(3,t);for(const t of i.values)e.writeMessage(4,Q,t);e.writeVarintField(5,t.extent||4096),e.writeVarintField(15,2)}function K(t,e){const i=t.feature;if(!i||!e)throw new Error;e.writeMessage(2,Y,t),e.writeVarintField(3,i.type),e.writeMessage(4,J,i)}function Y(t,e){const i=t.feature;if(!i||!e)throw new Error;const r=t.keys,s=t.values,n=t.keycache,o=t.valuecache;for(const t in i.properties){let a=i.properties[t],h=n[t];if(null===a)continue;void 0===h&&(r.push(t),h=r.length-1,n[t]=h),e.writeVarint(h);const l=typeof a;"string"!==l&&"boolean"!==l&&"number"!==l&&(a=JSON.stringify(a));const c=`${l}:${a}`;let d=o[c];void 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0===e||e.push(i),()=>i.push(et())},this.useTile=t=>{this.urls.indexOf(t)<0&&(this.urls.push(t),this.tilesFetched++)},this.fetchTile=t=>{this.fetched.indexOf(t)<0&&this.fetched.push(t)},this.addAll=t=>{var e;this.tilesFetched+=t.tilesUsed;const i=t.origin-this.timeOrigin;for(const r in t.marks){const s=r;(this.marks[s]||(this.marks[s]=[])).push(...(null===(e=t.marks[s])||void 0===e?void 0:e.map((t=>t.map((t=>t+i)))))||[])}this.resources.push(...t.resources.map((t=>function(t,e){const i={};for(const r in t)0!==t[r]&&st.test(r)?i[r]=Number(t[r])+e:i[r]=t[r];return i}(t,i))))},this.markFinish=this.marker(t)}}const st=/(Start$|End$|^start|^end)/;const nt=(t,e)=>a(void 0,void 0,void 0,(function*(){const i={signal:e.signal},r=yield fetch(t,i);if(!r.ok)throw new Error(`Bad response: ${r.status} for ${t}`);return{data:yield r.blob(),expires:r.headers.get("expires")||void 0,cacheControl:r.headers.get("cache-control")||void 0}}));let ot=0;t.A=class{constructor(t,e,i=2e4){this.callbacks={},this.cancels={},this.dest=t,this.timeoutMs=i,this.dest.onmessage=t=>a(this,[t],void 0,(function*({data:t}){const i=t;if("cancel"===i.type){const t=this.cancels[i.id];delete this.cancels[i.id],null==t||t.abort()}else if("response"===i.type){const t=this.callbacks[i.id];delete this.callbacks[i.id],t&&t(i.error?new Error(i.error):void 0,i.response,i.timings)}else if("request"===i.type){const t=new rt("worker"),r=e[i.name],s=new AbortController,n=r.apply(r,[...i.args,s,t]),o=`${i.name}_${i.id}`;if(i.id&&n){this.cancels[i.id]=s;try{const e=yield n,r=null==e?void 0:e.transferrables;this.postMessage({id:i.id,type:"response",response:e,timings:t.finish(o)},r)}catch(e){this.postMessage({id:i.id,type:"response",error:(null==e?void 0:e.toString())||"error",timings:t.finish(o)})}delete this.cancels[i.id]}}}))}postMessage(t,e){this.dest.postMessage(t,e||[])}send(t,e,i,r,...s){const n=++ot,o=new 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s;return[i,r]})))},t.c=S,t.d=V,t.e=function(t){var{thresholds:e}=t,i=o(t,["thresholds"]);return h(Object.assign({thresholds:l(e)},i)).map((([t,e])=>`${encodeURIComponent(t)}=${encodeURIComponent(e)}`)).join("&")},t.f=n,t.g=function(t,e){const{thresholds:i}=t,r=o(t,["thresholds"]);let s=[],n=-1/0;return Object.entries(i).forEach((([t,i])=>{const r=Number(t);r<=e&&r>n&&(n=r,s="number"==typeof i?[i]:i)})),Object.assign({levels:s},r)},t.h=function(t){return t.then((({arrayBuffer:t})=>({arrayBuffer:t,transferrables:[t]})))},t.p=function(t,e){return t.then((t=>{var{data:i}=t,r=o(t,["data"]);let s=i;return e&&(s=new Float32Array(i.length),s.set(i)),Object.assign(Object.assign({},r),{data:s,transferrables:[s.buffer]})}))}})),r(0,(function(t){const e=t=>Promise.reject(new Error(`No manager registered for ${t}`));const i="undefined"!=typeof self?self:"undefined"!=typeof window?window:global;i.actor=new t.A(i,new class{constructor(){this.managers={},this.init=(e,i)=>(this.managers[e.managerId]=new t.L(e),Promise.resolve()),this.fetchTile=(t,i,r,s,n,o)=>{var a;return(null===(a=this.managers[t])||void 0===a?void 0:a.fetchTile(i,r,s,n,o))||e(t)},this.fetchAndParseTile=(i,r,s,n,o,a)=>{var h;return t.p((null===(h=this.managers[i])||void 0===h?void 0:h.fetchAndParseTile(r,s,n,o,a))||e(i),!0)},this.fetchContourTile=(i,r,s,n,o,a,h)=>{var l;return t.h((null===(l=this.managers[i])||void 0===l?void 0:l.fetchContourTile(r,s,n,o,a,h))||e(i))}}})})),r(0,(function(t){const e={workerUrl:""};let i,r=0;class s{constructor(){this.decodeImage=(e,i,r)=>t.p(t.d(e,i,r),!1)}}class n{constructor(n){this.fetchTile=(t,e,i,r,s)=>this.actor.send("fetchTile",[],r,s,this.managerId,t,e,i),this.fetchAndParseTile=(t,e,i,r,s)=>this.actor.send("fetchAndParseTile",[],r,s,this.managerId,t,e,i),this.fetchContourTile=(t,e,i,r,s,n)=>this.actor.send("fetchContourTile",[],s,n,this.managerId,t,e,i,r);const o=this.managerId=++r;this.actor=n.actor||function(){if(!i){const r=new Worker(e.workerUrl),n=new s;i=new t.A(r,n)}return i}(),this.loaded=this.actor.send("init",[],new AbortController,void 0,Object.assign(Object.assign({},n),{managerId:o}))}}Blob.prototype.arrayBuffer||(Blob.prototype.arrayBuffer=function(){return new Promise(((t,e)=>{const i=new FileReader;i.onload=e=>{var i;return t(null===(i=e.target)||void 0===i?void 0:i.result)},i.onerror=e,i.readAsArrayBuffer(this)}))});const o=t=>(e,i)=>{if(i instanceof AbortController)return t(e,i);{const r=new AbortController;return t(e,r).then((t=>i(void 0,t.data,t.cacheControl,t.expires)),(t=>i(t))).catch((t=>i(t))),{cancel:()=>r.abort()}}},a=new Set;const h={generateIsolines:t.f,DemSource:class{constructor({url:e,cacheSize:i=100,id:r="dem",encoding:s="terrarium",maxzoom:h=12,worker:l=!0,timeoutMs:c=1e4,actor:d}){this.timingCallbacks=[],this.onTiming=t=>{this.timingCallbacks.push(t)},this.setupMaplibre=t=>{t.addProtocol(this.sharedDemProtocolId,this.sharedDemProtocol),t.addProtocol(this.contourProtocolId,this.contourProtocol)},this.sharedDemProtocolV4=(e,i)=>t._(this,void 0,void 0,(function*(){const[r,s,n]=t.a(e.url),o=new t.T("main");let a;try{const t=yield this.manager.fetchTile(r,s,n,i,o);a=o.finish(e.url);return{data:yield t.data.arrayBuffer(),cacheControl:t.cacheControl,expires:t.expires}}catch(t){throw a=o.error(e.url),t}finally{this.timingCallbacks.forEach((t=>t(a)))}})),this.contourProtocolV4=(e,i)=>t._(this,void 0,void 0,(function*(){const r=new t.T("main");let s;try{const[n,o,a]=t.a(e.url),h=t.b(e.url),l=yield this.manager.fetchContourTile(n,o,a,t.g(h,n),i,r);return s=r.finish(e.url),{data:l.arrayBuffer}}catch(t){throw s=r.error(e.url),t}finally{this.timingCallbacks.forEach((t=>t(s)))}})),this.contourProtocol=o(this.contourProtocolV4),this.sharedDemProtocol=o(this.sharedDemProtocolV4),this.contourProtocolUrl=e=>`${this.contourProtocolUrlBase}?${t.e(e)}`;let u=r,f=1;for(;a.has(u);)u=r+f++;a.add(u),this.sharedDemProtocolId=`${u}-shared`,this.contourProtocolId=`${u}-contour`,this.sharedDemProtocolUrl=`${this.sharedDemProtocolId}://{z}/{x}/{y}`,this.contourProtocolUrlBase=`${this.contourProtocolId}://{z}/{x}/{y}`;const p=l?n:t.L;this.manager=new p({demUrlPattern:e,cacheSize:i,encoding:s,maxzoom:h,timeoutMs:c,actor:d})}getDemTile(t,e,i,r){return this.manager.fetchAndParseTile(t,e,i,r||new AbortController)}},HeightTile:t.H,LocalDemManager:t.L,decodeParsedImage:t.c,set workerUrl(t){e.workerUrl=t},get workerUrl(){return e.workerUrl}};return h})),i}));