在geojson数据坐标点中如何获取中心点,如下面显示数据,获取coordinates数组中坐标的中心点
{
"type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
30.55459965000017,
-2.400627542999871
],
[
30.41579675300011,
-2.851659443999836
],
[
30.82548750800015,
-2.9785767609999
],
[
30.799752645000183,
-3.274579365999841
],
[
30.46892012600017,
-3.513014424999909
],
[
30.00300541100006,
-4.271934508999834
],
[
29.654353124914053,
-4.450591078822441
],
[
29.206678641706503,
-3.334424246383435
],
[
29.015365438000117,
-2.720711364999943
],
[
29.697546021000107,
-2.808251240999923
],
[
29.931691935000117,
-2.316911722999919
],
[
30.55459965000017,
-2.400627542999871
]
]
]
}
}