# GeoJson
GeoJson是Json数据(键值对)，它是针对地理数据的一个变种
# 介绍
一个标准的GeoJson如下所示
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [125.6, 10.1]
},
"properties": {
"name": "Dinagat Islands"
}
}
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最外层：
- type："Feature"表示一个特征要素，"FeatureCollection"表示为特征要素的集合
- geometry：存储该特征要素的实际形状描述
- properties：存储该要素的属性
geometry：
type：存储要素类型（Point(点),LineString,Polygon,MultiPoint(多点),MultiLineString(多线)和MultiPolygon(多面)）
coordinates：坐标（存储图形坐标）
# Feature
//点-Point
{"type":"Feature",
"properties":{},
"geometry":{
"type":"Point",
"coordinates":[105.380859375,31.57853542647338]
}
}
//多点-MultiPoint
{"type":"Feature",
"properties":{},
"geometry":{
"type":"MultiPoint",
"coordinates":[[105.380859375,31.57853542647338],
[105.580859375,31.52853542647338]
]
}
}
// 线-LineString
{"type":"Feature",
"properties":{},
"geometry":{
"type":"LineString",
"coordinates":[[105.6005859375,30.65681556429287],
[107.95166015624999,31.98944183792288],
[109.3798828125,30.031055426540206],
[107.7978515625,29.935895213372444]]
}
}
// 多线-MultiLineString（3维数组）
{"type":"Feature",
"properties":{},
"geometry":{
"type":"MultiLineString",
"coordinates":
[
[
[105.6005859375,30.65681556429287],
[107.95166015624999,31.98944183792288],
[109.3798828125,30.031055426540206],
[107.7978515625,29.935895213372444]
],
[
[109.3798828125,30.031055426540206],
[107.1978515625,31.235895213372444]
]
]
}
}
//多边形-Polygon
{"type":"Feature",
"properties":{},
"geometry":{
"type":"Polygon",
"coordinates":[
[
[106.10595703125,33.33970700424026],
[106.32568359375,32.41706632846282],
[108.03955078125,32.2313896627376],
[108.25927734375,33.15594830078649],
[106.10595703125,33.33970700424026]
]
]
}
}
//多多边形-MultiPolygon（两个不相交的多边形）
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "MultiPolygon",
"coordinates":
[
[
[
[109.2041015625,30.088107753367257],
[115.02685546875,30.088107753367257],
[115.02685546875,32.7872745269555],
[109.2041015625,32.7872745269555],
[109.2041015625,30.088107753367257]
]
],
[
[
[112.9833984375,26.82407078047018],
[116.69677734375,26.82407078047018],
[116.69677734375,29.036960648558267],
[112.9833984375,29.036960648558267],
[112.9833984375,26.82407078047018]
]
]
]
}
}
//多多边形-MultiPolygon（两个嵌套的多边形）
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "MultiPolygon",
"coordinates":
[
[
[
[101.6455078125,27.68352808378776],
[114.78515624999999,27.68352808378776],
[114.78515624999999,35.209721645221386],
[101.6455078125,35.209721645221386],
[101.6455078125,27.68352808378776]
]
],
[
[
[104.2822265625,30.107117887092357],
[108.896484375,30.107117887092357],
[108.896484375,33.76088200086917],
[104.2822265625,33.76088200086917],
[104.2822265625,30.107117887092357]
]
]
]
}
}
//多多边形-MultiPolygon（有孔洞的多边形）
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "MultiPolygon",
"coordinates":
[
[
[
[101.6455078125,27.68352808378776],
[114.78515624999999,27.68352808378776],
[114.78515624999999,35.209721645221386],
[101.6455078125,35.209721645221386],
[101.6455078125,27.68352808378776]
],
[
[104.2822265625,30.107117887092357],
[108.896484375,30.107117887092357],
[108.896484375,33.76088200086917],
[104.2822265625,33.76088200086917],
[104.2822265625,30.107117887092357]
]
]
]
}
}
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# FeatureCollection
{
"type": "FeatureCollection",
"features": []
}
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- features：可以存在多个feature，并且feature的种类可以不同
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
120.16845703125,
29.931134809868684
],
[
119.63562011718751,
30.159376896356193
],
[
119.5751953125,
30.140376821599734
],
[
119.4708251953125,
29.90256760730233
],
[
119.6246337890625,
29.401319510041485
],
[
120.0311279296875,
29.57345707301757
],
[
120.16845703125,
29.931134809868684
]
]
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [
119.63012695312499,
30.685163937659564
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "LineString",
"coordinates": [
[
118.740234375,
29.07057414581467
],
[
119.234619140625,
28.806173508854776
],
[
119.80590820312499,
28.73394733840369
]
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
119.05334472656249,
30.30176068632071
],
[
119.5147705078125,
30.30176068632071
],
[
119.5147705078125,
30.5717205651999
],
[
119.05334472656249,
30.5717205651999
],
[
119.05334472656249,
30.30176068632071
]
]
]
}
}
]
}
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# geometryCollection
只存图形
{
"type": "GeometryCollection",
"geometries": [
{
"type": "Point",
"coordinates": [108.62, 31.02819]
}, {
"type": "LineString",
"coordinates": [[108.896484375,30.1071178870],
[108.2184375,30.91717870],
[109.5184375,31.2175780]]
}]
}
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