.netcore + postgis 保存地图围栏数据

一、数据库字段

字段类型选择(Type)

设置对象类型为：geometry

二、前端传递的Json格式转换

前端传递围栏的各个坐标点数据如下：

{"AreaRange": [{"lat": 30.123456,"lng": 120.123456},{"lat": 30.123456,"lng": 120.654321},{"lat": 30.654321,"lng": 120.654321},{"lat": 30.654321,"lng": 120.123456}]
}

后端使用Geometry类型，ORM本项目使用了SqlSugar

/// <summary>
/// 区域围栏
/// </summary>
[SugarColumn(ColumnName= "arearange")]
public Geometry? AreaRange { get; set; }

public class MapProperty
{/// <summary>/// Latitude的简写，表示纬度/// </summary>public double lat { get; set; }/// <summary>/// Longtitude的简写，表示经度/// </summary>public double lng { get; set; }
}

后端Json转Geometry ( Polygon)多边形或者线

public static Polygon ConvertToPolygon(List<MapProperty> data)
{if (data == null || data.Count < 3){throw new ArgumentException("至少需要三个点才能创建多边形");}// 创建几何工厂GeometryFactory factory = new GeometryFactory(new PrecisionModel(), 4326);// 将 List<MapProperty> 转换为 List<Coordinate>List<Coordinate> coordinates = data.Select(mp => new Coordinate(mp.lng, mp.lat)).ToList();// 添加第一个点以闭合多边形coordinates.Add(coordinates[0]);// 创建线性环LinearRing linearRing = factory.CreateLinearRing(coordinates.ToArray());// 创建多边形Polygon polygon = factory.CreatePolygon(linearRing);return polygon;
}
public static LineString ConvertToLineString(List<MapProperty> data){if (data == null || data.Count < 2){throw new ArgumentException("至少需要两个点才能创建多段线");}// 创建几何工厂GeometryFactory factory = new GeometryFactory();// 将 List<MapProperty> 转换为 List<Coordinate>List<Coordinate> coordinates = data.Select(mp => new Coordinate(mp.lng, mp.lat)).ToList();// 创建多段线LineString lineString = factory.CreateLineString(coordinates.ToArray());return lineString;}

保存入库

var area = GeoJsonHelper.ConvertToPolygon(request.AreaRange);
CommunityExtEntity ext = new CommunityExtEntity()
{AreaRange = area,
};
await _app.Insertable(ext).ExecuteCommandAsync();