nettopologysuite

项目地址： https://github.com/NetTopologySuite/NetTopologySuite

NuGet： NetTopologySuite

官方文档： https://nettopologysuite.github.io/NetTopologySuite/

许可证： BSD-3-Clause

概述

NTS 与 JTS API 几乎一一对应（C# 命名风格）：

• 几何模型：Point/LineString/Polygon/Multi*/GeometryCollection
• 空间关系：Equals/Contains/Within/Intersects/Touches/Crosses/Overlaps/Disjoint/Relate
• 集合运算：Intersection/Union/Difference/SymmetricDifference/Buffer
• 几何分析：ConvexHull/Centroid/Area/Length/Distance/IsValid/Simplify
• 空间索引：STRtree/Quadtree
• 格式读写：WKT、WKB、GeoJSON、Shapefile（独立 NuGet）
• EF Core 集成：SqlServer 与 PostgreSQL 自动翻译为空间 SQL

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环境准备

dotnet add package NetTopologySuite
dotnet add package NetTopologySuite.IO.GeoJSON
dotnet add package NetTopologySuite.IO.ShapeFile
dotnet add package ProjNet                          # 坐标变换（可选）

.NET 6+ 推荐。

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几何工厂

using NetTopologySuite.Geometries;

var gf = new GeometryFactory(new PrecisionModel(), 4326);

var p  = gf.CreatePoint(new Coordinate(116.397, 39.908));
var ls = gf.CreateLineString(new[] {
    new Coordinate(116, 39), new Coordinate(117, 40)
});
var poly = gf.CreatePolygon(new[] {
    new Coordinate(0,0), new Coordinate(10,0),
    new Coordinate(10,10), new Coordinate(0,10), new Coordinate(0,0)
});

---

空间关系与运算

bool b   = polyA.Intersects(polyB);
var inter = polyA.Intersection(polyB);
var union = polyA.Union(polyB);
var diff  = polyA.Difference(polyB);

var buf  = p.Buffer(100);
var hull = mp.ConvexHull();
double area = poly.Area;
double len  = ls.Length;
double dist = polyA.Distance(polyB);

string rel = polyA.Relate(polyB).ToString();
bool ok    = polyA.Relate(polyB, "T*F**F***");

---

WKT / WKB / GeoJSON

using NetTopologySuite.IO;

var rdr = new WKTReader();
var g = rdr.Read("POINT (116.4 39.9)");

string wkt = new WKTWriter().Write(g);
byte[] wkb = new WKBWriter().Write(g);

using NetTopologySuite.IO.Converters;
using System.Text.Json;
var opts = new JsonSerializerOptions();
opts.Converters.Add(new GeoJsonConverterFactory());
string json = JsonSerializer.Serialize(g, opts);
var g2 = JsonSerializer.Deserialize<Geometry>(json, opts);