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Last active March 23, 2023 18:53
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JavaScript: Convert GeoJSON Polygon to WKT
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<link type="text/css" rel="stylesheet" href="stylesheet.css"/>
<title>Convert GeoJSON</title>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="poly.js"></script>
</head>
<body>
<h1>Convert <a href="http://geojson.org/geojson-spec.html#appendix-a-geometry-examples">GeoJSON-Polygon</a> to <a href="http://en.wikipedia.org/wiki/Well-known_text">WKT-POLYGON</a></h1>
<div class='block'>
<div>
<h1>Input: GeoJSON</h1>
<textarea id="geojson-input" placeholder="Paste GeoJSON here"></textarea>
<p class = 'convert' id='convert'>Convert</p>
</div>
</div>
<div class='block'>
<div>
<h1>Output: GeoJSON</h1>
<textarea id="geojson-output" placeholder="Resulting WKT will be displayed here"></textarea>
</div>
</div>
</body>
<script>
d3.select('#convert').on('mouseup',function(){convert();})
//initialise input of textarea
d3.select('#geojson-input').text(JSON.stringify(Polygon, null, 4));
function convert(){
console.log('hey')
//initialize json-textarea-input
var input = $('#geojson-input').val();
//get the input as json-object
var input_json = JSON.parse(input);
//console.log(input_json)
//convert the json-input to WKT
var wkt_str = 'POLYGON('+
input_json.coordinates.map(function(ring){
return '(' + ring.map(function(p) {
return p[0] + ' ' + p[1];
}).join(', ') + ')';
}).join(', ')+')';
//fill the resulting WKT-Polygon to output textarea
d3.select('#geojson-output').text(wkt_str);
}
</script>
</html>
Raw
poly.js
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"type": "LineString",
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Raw
stylesheet.css
body{
background-color:black;
}
.block{
display:inline-block;
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.non_block{
display:block;
}
h1, a{
font-size:125%;
color:#fff;
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textarea{
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p{
color:#fff;
margin:5px;
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.convert{
border-radius: 5px;
border: 2px solid #fff;
background-color: #999;
width: 100px;
text-align: center;
font-size:12px;
padding:3px;
}
.convert:hover{
background-color: #ddd;
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