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HTML

              
                <svg id="svg" width="400" height="500" viewBox="138 34 3 3">
  <title>流山の輪郭</title>
  <polygon id="nagareyama" fill="#33aa33" stroke="black" stroke-width="0.4%" ></polygon>
</svg>

              
            
!

CSS

              
                svg {
  border: solid 1px black;
  transform: scaleY(-1);
}
              
            
!

JS

              
                // path data by https://gadm.org/download_country_v3.html
const coodsStr = `
139.894180297852,35.8254623413086 139.893783569336,35.8283271789552 139.892517089844,35.8373336791993 139.898101806641,35.8476142883302 139.898910522461,35.8493919372559 139.903839111328,35.8601684570312 139.902236938477,35.8647155761718 139.900024414063,35.8709754943848 139.896774291992,35.8819999694824 139.891708374023,35.8917503356934 139.887405395508,35.8968696594238 139.884201049805,35.9006767272949 139.883636474609,35.9015197753907 139.885635375977,35.9027595520021 139.893020629883,35.90673828125 139.898147583008,35.9089698791504 139.9033203125,35.9110412597657 139.907165527344,35.9121627807618 139.911880493164,35.9130287170411 139.918334960938,35.9144134521485 139.925552368164,35.9149398803711 139.931671142578,35.9157257080079 139.937637329102,35.9160842895508 139.934280395508,35.909278869629 139.93293762207,35.9053268432618 139.932662963867,35.9032745361328 139.932235717774,35.8969841003419 139.931488037109,35.8935661315919 139.931243896484,35.8914947509766 139.931259155273,35.8887100219728 139.931594848633,35.8866806030273 139.93212890625,35.885383605957 139.933883666992,35.8825645446777 139.935394287109,35.880844116211 139.936553955078,35.8789176940919 139.937286376953,35.877986907959 139.938339233399,35.8772621154785 139.940200805664,35.8762397766114 139.943298339844,35.8747062683107 139.94612121582,35.8727264404296 139.946868896484,35.8717155456543 139.946975708008,35.8705635070801 139.946472167969,35.8694725036622 139.946029663086,35.8690338134766 139.941970825195,35.8660774230958 139.940719604492,35.8643188476564 139.940399169922,35.8633346557618 139.940704345703,35.8624534606934 139.941436767578,35.8618659973145 139.942520141602,35.8614616394044 139.945297241211,35.8609161376953 139.946258544922,35.8603820800781 139.946624755859,35.8599395751954 139.946929931641,35.8589057922363 139.946624755859,35.8552284240724 139.946823120117,35.8525428771973 139.947280883789,35.8512077331544 139.949035644531,35.8481674194336 139.949951171875,35.8470458984375 139.951843261719,35.8456802368164 139.958877563477,35.8426322937013 139.960205078125,35.8417854309082 139.961318969727,35.840732574463 139.962112426758,35.8396224975587 139.963562011719,35.837287902832 139.964004516602,35.8360061645508 139.96403503418,35.8347434997559 139.963668823242,35.8335418701172 139.963302612305,35.8329963684082 139.962280273438,35.8321762084962 139.959701538086,35.8308258056641 139.956085205078,35.8294143676759 139.952224731445,35.8277282714844 139.949432373047,35.8263206481934 139.948165893555,35.8264198303224 139.946990966797,35.8266983032227 139.944900512695,35.8276481628418 139.942428588867,35.8284034729004 139.941848754883,35.8286590576173 139.938110351562,35.8309707641602 139.936645507813,35.8322486877441 139.935852050781,35.8332328796387 139.935256958008,35.8343505859376 139.934432983398,35.8367309570312 139.933822631836,35.8376579284669 139.933090209961,35.8382949829102 139.932495117188,35.8386421203614 139.931243896484,35.8391151428223 139.929870605469,35.8393821716309 139.929153442383,35.8393478393554 139.928482055664,35.839168548584 139.927871704102,35.8388328552247 139.927429199219,35.8383750915528 139.926986694336,35.8373374938966 139.92658996582,35.8349876403809 139.926177978516,35.8337593078613 139.925506591797,35.8327102661133 139.924133300781,35.8313331604004 139.919876098633,35.8286170959473 139.916259765625,35.8273468017578 139.914688110352,35.8265380859376 139.913345336914,35.8261604309082 139.911010742188,35.825912475586 139.898956298828,35.8258171081544 139.896438598633,35.8256874084474 139.894180297852,35.8254623413086
`.trim();
const coods = coodsStr.split(" ").map((latlng) => latlng.split(","));

// 最先端(最{東西南北}端)
const lons = coods.map((v) => v[0]);
const lats = coods.map((v) => v[1]);
// console.log(lons.length) // 420

const max = (a, b) => Math.max(a, b);
const min = (a, b) => Math.min(a, b);
const e = lons.reduce(max, 0);
const w = lons.reduce(min, 999);
const n = lats.reduce(max, 0);
const s = lats.reduce(min, 999);
// console.log({n, s, e, w})

const polygon = document.getElementById("nagareyama");
polygon.setAttribute("points", coodsStr);

const ns = n - s
const ew = e - w
const $svg = document.getElementById("svg");
$svg.setAttribute("viewBox", `${w} ${s} ${ew} ${ns}`);

// polygon.node.points(...coods.flat())


// // 正規化
// const coods2 = coods.map(([lon, lat]) => [
//   (lon - w) / ew,
//   (n - lat) / ew,
// ])

// const polygon2 = document.getElementById("nagareyama2");
// polygon2.setAttribute("points", coods2.map(cood => cood.join(',')).join(' '));

// const $svg2 = document.getElementById("svg2");
// $svg2.setAttribute("viewBox", `0 0 1 1`);


// // 丸め込み
// const resolution = 1000
// const coods3 = coods2.map((cood) => cood.map(v => Math.round(v * resolution)))

// const $svg3 = document.getElementById("svg3");
// $svg3.setAttribute("viewBox", `0 0 ${resolution} ${resolution}`);

// const polygon3 = document.getElementById("nagareyama3");
// polygon3.setAttribute("points", coods3.map(cood => cood.join(',')).join(' '));

              
            
!
999px

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