WKT形式をGeoJSON形式に変換する ref: http://qiita.com/yuichy/items/14f2cb7d4ed113eca727

file0.txt

<script src="terraformer.min.js"></script>
<script src="terraformer-wkt-parser.min.js"></script>

file1.txt

var geoJSONSingle = Terraformer.WKT.parse( wktSingle );

file2.txt

MULTIPOINT ((10 40), (40 30), (20 20), (30 10))

file3.txt

{"type":"MultiPoint","coordinates":[[10,40],[40,30],[20,20],[30,10]],"bbox":[10,10,40,40]}

file4.txt

//wktObj...変換前のWKTデータ、geoJSONObj...変換後のGeoJsonデータ
var _geoArray = new Array();

for (var i=0; i<wktObj.length; i++) {
    var _o = new Object();

    _o["type"] = "Feature";
    _o["geometry"] = Terraformer.WKT.parse( wktObj[i] );
    _o["properties"] = {"country_id": "some_id",
                            "count": "some_count"};
    _geoArray[i] = _a;
};

var geoJSONObj = {
"type": "FeatureCollection"
};

geoJSONObj["features"] = _geoArray;