求2个图形的交集,如果交集等于其中一个图形,就满足你说的条件.
你问AI这个应该能实现你的要求

1. 现成轮子NetTopologySuite，将坐标转为对应轮子的Polygon

using NetTopologySuite.Geometries;

using System;
using System.Collections.Generic;
using System.Linq;
namespace Gis
{
    public static class GeometryConverter
    {
        // 几何工厂（SRID=4326表示WGS84经纬度坐标系）
        private static readonly GeometryFactory _wgs84Factory = new GeometryFactory(new PrecisionModel(PrecisionModels.Floating), 4326);

        /// <summary>
        /// 将自定义Point列表转换为NetTopologySuite的Polygon对象
        /// </summary>
        /// <param name="points">坐标点列表（建议闭合，若未闭合则自动补全）</param>
        /// <returns>有效的Polygon对象</returns>
        /// <exception cref="ArgumentException">点数量不足时抛出</exception>
        public static Polygon ConvertToPolygon(List<Point> points)
        {
            if (points == null || points.Count < 3)
                throw new ArgumentException("多边形至少需要3个不同的坐标点", nameof(points));

            // 转换为NetTopologySuite的Coordinate数组
            var coordinates = points.Select(p => new Coordinate(p.Lon, p.Lat)).ToArray();

            // 确保多边形闭合（第一个点与最后一个点一致）
            if (!coordinates.First().Equals2D(coordinates.Last()))
                coordinates = coordinates.Concat(new[] { coordinates.First() }).ToArray();

            // 创建线性环（外环）
            var linearRing = _wgs84Factory.CreateLinearRing(coordinates);

            // 创建多边形并修复无效几何（如自相交）
            var polygon = _wgs84Factory.CreatePolygon(linearRing);
            return !polygon.IsValid ? (Polygon)polygon.Buffer(0) : polygon;
        }
    }
}

2. 做判定

using NetTopologySuite.Geometries;

using System;

namespace Gis
{
    public static class PolygonRelationChecker
    {
        /// <summary>
        /// 判断PolygonA是否在PolygonB内部（包括边界，排除完全重合可额外判断）
        /// </summary>
        /// <param name="polygonA">待判断多边形</param>
        /// <param name="polygonB">容器多边形</param>
        /// <returns>是否在内部</returns>
        public static bool IsPolygonAInsidePolygonB(Polygon polygonA, Polygon polygonB)
        {
            if (polygonA == null || polygonB == null)
                throw new ArgumentNullException("多边形对象不能为空");

            // Within：OGC标准，A的所有点在B内部/边界，且A内部与B内部有交集
            // 若需更宽泛的包含（如重合），可使用 polygonB.Covers(polygonA)
            return polygonA.Within(polygonB);
        }

        /// <summary>
        /// 判断PolygonA与PolygonB是否重合（完全重合/部分边重合）
        /// </summary>
        /// <param name="polygonA">多边形A</param>
        /// <param name="polygonB">多边形B</param>
        /// <param name="tolerance">精度容差（经纬度1e-6≈1米）</param>
        /// <returns>是否重合</returns>
        public static bool IsPolygonAOverlappingWithPolygonB(Polygon polygonA, Polygon polygonB, double tolerance = 1e-6)
        {
            if (polygonA == null || polygonB == null)
                throw new ArgumentNullException("多边形对象不能为空");

            // 1. 完全重合（允许微小精度误差）
            if (polygonA.EqualsExact(polygonB, tolerance))
                return true;

            // 2. 部分边重合（交集为线串且长度大于0）
            var intersection = polygonA.Intersection(polygonB);
            return intersection switch
            {
                LineString line => !line.IsEmpty && line.Length > tolerance,
                MultiLineString multiLine => !multiLine.IsEmpty && multiLine.Length > tolerance,
                _ => false
            };
        }

        /// <summary>
        /// 综合判断：PolygonA是否在PolygonB内部，或与PolygonB重合
        /// </summary>
        /// <param name="polygonA">多边形A</param>
        /// <param name="polygonB">多边形B</param>
        /// <returns>是否满足条件</returns>
        public static bool IsPolygonAInsideOrOverlappingWithPolygonB(Polygon polygonA, Polygon polygonB)
        {
            return IsPolygonAInsidePolygonB(polygonA, polygonB)
                   || IsPolygonAOverlappingWithPolygonB(polygonA, polygonB);
        }
    }
}

3. 判定例子

namespace Gis
{
    public class Point
    {
        public double Lon { get; set; }
        public double Lat { get; set; }

        public Point(double lon, double lat)
        {
            Lon = lon;
            Lat = lat;
        }
    }
}

using System;
using System.Collections.Generic;

namespace Gis
{
    public class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");


            // 示例：PolygonB（外部多边形）
            var polygonBPoints = new List<Point>()
            {
            //new Point(113.123456, 32.754321),
            //new Point(113.823456, 32.754321),
            //new Point(113.423456, 32.354321),
            //new Point(113.823456, 32.054321),
            //new Point(113.123456, 32.054321),
            //new Point(113.123456, 32.754321),
            new Point(0,0),
            new Point(2,2),
            new Point(4,0),
            new Point(0,0)
        };

            // 示例：PolygonA（内部多边形）
            var polygonAPoints = new List<Point>
        {
            //new Point(113.323456, 32.654321),
            //new Point(113.723456, 32.654321),
            //new Point(113.723456, 32.154321),
            //new Point(113.323456, 32.154321)
            
            //new Point(113.123456, 32.754321),
            //new Point(113.823456, 32.754321),
            //new Point(113.423456, 32.354321),
            //new Point(113.823456, 32.054321),
            //new Point(113.123456, 32.054321),
            //new Point(113.123456, 32.754321),
            new Point(0,0),
            new Point(2,2),
            new Point(4,0),
            new Point(0,0)
        };

            // 转换为NetTopologySuite多边形
            var polygonA = GeometryConverter.ConvertToPolygon(polygonAPoints);
            var polygonB = GeometryConverter.ConvertToPolygon(polygonBPoints);

            // 可选：大范围多边形投影转换
            // polygonA = ProjectionHelper.Project4326To3857(polygonA);
            // polygonB = ProjectionHelper.Project4326To3857(polygonB);

            // 判断关系
            var isInsideOrOverlapping = PolygonRelationChecker.IsPolygonAInsideOrOverlappingWithPolygonB(polygonA, polygonB);
            Console.WriteLine($"PolygonA是否在PolygonB内部或重合：{isInsideOrOverlapping}");
        }
    }
}