README.md · Lencho/Bouyei.Geo

# bouyei.Geo

#### 介绍
---

是地理信息空间数据常用格式解析动态库，为方便灵活高效无依赖处理常用的数据文件格式提供支持,shpfile,esri mdb,spatialite,geopackage,ogc(geojson,wkt,wkb等)等的数据格式进行解析和生成。增加支持常用的geometry算法支持，如:高斯正反算，平面面积计算，椭球面积计算等。

Bouyei.Geo 基于.net framework 4.5.1+

Bouyei.GeoCore 基于.net core 2.0+

Bystd.Geo 基于.net standard 2.0+

#### Package
---

Package  | NuGet 
-------- | :------------ 
Bouyei.Geo		| [![NuGet](https://img.shields.io/nuget/v/Bouyei.Geo.svg)](https://www.nuget.org/packages/Bouyei.Geo)
Bouyei.GeoCore		| [![NuGet](https://img.shields.io/nuget/v/Bouyei.GeoCore.svg)](https://www.nuget.org/packages/Bouyei.GeoCore)
Bystd.Geo| [![NuGet](https://img.shields.io/nuget/v/Bystd.Geo.svg)](https://www.nuget.org/packages/Bystd.Geo)

#### 介绍

1、支持常用geometry数据格式解析转换。

2、支持基本geometry算法如相交和面积计算等。

3、精简尽量无依赖第三方库方便可修改可移植。

4、最大限度的简单引用和入手学习使用。

#### 安装教程

1. vs or vs code

#### 使用说明

1.  nuget install
2.  面积计算

string wktstr = "POLYGON ((36379440.1493 2936717.206599999, 36379425.4384 2936710.4860999994, 36379423.0042             2936716.307, 36379437.133 2936723.318499999, 36379440.1493 2936717.206599999))";

GeoPlane plane = new GeoPlane();
            var area = plane.Area(wktstr);

GeoEllipsoid geo = new GeoEllipsoid();
            var ellipse = geo.Area(wktstr);

var dist = geo.Distance(new Coordinate()
            {
                X = 36379440.1493,
                Y = 2936717.206599999
            },
             new Coordinate()
             {
                 X = 36379425.4384,
                 Y = 2936710.4860999994
             });

var geopoint = new Coordinate()
            {
                X = 36367729.9624,
                Y = 2941185.8308
            };

var bl = plane.XYtoLB(geopoint);
            var bxy = plane.LBtoXY(bl);
3.  esri mdb解析

string connstr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=E:\LINE.mdb;";
            using (IAdoProvider provider = AdoProvider.CreateProvider(connstr, FactoryType.OleDb))
            {
                var rt = provider.Query<Item>(new Parameter("select top 1 SHAPE as wkb from multipoint"));
                var items = rt.Result;
                List<Geometry> geos = new List<Geometry>();
                foreach (var item in items)
                {
                    EsriMdbParser wkbParser = new  EsriMdbParser(item.wkb);
                    var geo = wkbParser.FromReader();

//生成wkt
                   // string wkt= geo.ToWkt();

geos.Add(geo);
                }
            }
4.geojson 解析

string file = "C:\\3DCity.json";// AppContext.BaseDirectory + "testfiles\\feature.geojson";//"C:\\3DCity.json";
            string content = File.ReadAllText(file, Encoding.UTF8);
            GeoJsonParser json = new GeoJsonParser(content);

var geo = json.ToFeatures<attr, JsonMultiPolygon>();

List<double[]> coords = new List<double[]>();
            coords.Add(new double[] { 1, 2 });
            coords.Add(new double[] { 2, 3 });

var collection = new FeatureCollection<attr, JsonLineString>()
            {
                name = "册亨县八渡镇",
                features = new Feature<attr, JsonLineString>[] {
                 new Feature<attr, JsonLineString>(){
                 properties=new attr(){  name="乃言村",code="522327"},
                 geometry=new JsonLineString(){
                 coordinates=coords
              }
             }
            }
            };
            var str = json.ToWrite<attr, JsonLineString>(collection);

5.spatialite 解析

string connstr = $"Data Source={sqlite};Version=3;Read Only=True;Pooling=False;Max Pool Size=100;";
            using (var provider = AdoProvider.CreateProvider(connstr, FactoryType.SQLite))
            {
                var rt = provider.Query<SpatiaLiteGeo>(new Parameter("select * from mian"));
                if (rt.IsSuccess() == false)
                    throw new Exception(rt.Info);

SpatiaLiteParser parser = new SpatiaLiteParser();

foreach (var item in rt.Result)
                {
                    //解析spatialite 字节
                    var geo = parser.FromReader(item.GEOMETRY);

//还原为spatialite字节
                    var geo_buffer= parser.ToWriter(geo);

Console.WriteLine(geo.ToWkt());
                }
            }

6.geopackage 解析

string connstr = $"Data Source={sqlite};Version=3;Read Only=True;Pooling=False;Max Pool Size=100;";
            using (var provider = AdoProvider.CreateProvider(connstr, FactoryType.SQLite))
            {
                var rt = provider.Query<GeoPackageGeo>(new Parameter("select * from xian"));
                if (rt.IsSuccess() == false)
                    throw new Exception(rt.Info);

GeoPackageParser parser = new  GeoPackageParser();

foreach (var item in rt.Result)
                {
                    //还原为geopackage字节
                    var geo = parser.FromReader(item.geom);
                    Console.WriteLine(geo.ToWkt());

//还原为geopackage字节
                    var geo_buffer = parser.ToWriter(geo);

//测试writer方法结果
                    var g=parser.FromReader(geo_buffer);

Console.WriteLine(geo.ToWkt());
                }
            }

Lencho/Bouyei.Geo

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Lencho/Bouyei.Geo