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OpenGIS Utils for .NET

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English

Overview

OpenGIS Utils for .NET (OGU4Net) is a comprehensive GIS development toolkit for .NET based on MaxRev.Gdal.Universal. It provides a unified layer model and convenient format conversion capabilities to simplify reading, processing, and exporting GIS data.

This project is a complete port of opengis-utils-for-java to C# .NET Standard 2.0.

Key Features

  • 🎯 Unified Layer Model: Simple and consistent OguLayer, OguFeature, and OguField abstractions that hide underlying GIS library differences
  • 🔄 Format Conversion: Seamless conversion between Shapefile, GeoJSON, FileGDB, PostGIS, GeoPackage, KML, DXF, and TXT formats
  • 🌐 Coordinate System Support: Comprehensive CRS transformation using GDAL/OGR with built-in CGCS2000 support
  • 📐 Geometry Processing: Rich set of spatial operations including buffer, intersection, union, topology validation, and more
  • 🔧 GDAL-Based Architecture: All operations powered by GDAL/OGR for maximum compatibility and performance
  • 📦 Cross-Platform: Runs on Windows, Linux, and macOS via .NET Standard 2.0
  • 🛠️ Utility Classes: Encoding detection, ZIP compression, natural sorting, and numeric formatting

Installation

dotnet add package OpenGIS.Utils

Or via NuGet Package Manager:

Install-Package OpenGIS.Utils

Quick Start

Basic Layer Operations

using OpenGIS.Utils.Engine.Model.Layer;
using OpenGIS.Utils.Engine.Enums;

// Create a new layer
var layer = new OguLayer
{
    Name = "My Layer",
    GeometryType = GeometryType.POINT,
    Wkid = 4326
};

// Add fields
layer.AddField(new OguField
{
    Name = "ID",
    DataType = FieldDataType.INTEGER
});

layer.AddField(new OguField
{
    Name = "Name",
    DataType = FieldDataType.STRING,
    Length = 50
});

// Add features
var feature = new OguFeature
{
    Fid = 1,
    Wkt = "POINT (116.404 39.915)"
};
feature.SetValue("ID", 1);
feature.SetValue("Name", "Beijing");
layer.AddFeature(feature);

// Validate layer
layer.Validate();

Console.WriteLine($"Layer '{layer.Name}' has {layer.GetFeatureCount()} features");

Geometry Operations

using OpenGIS.Utils.Geometry;

// WKT to GeoJSON conversion
string wkt = "POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0))";
string geojson = GeometryUtil.Wkt2Geojson(wkt);

// Buffer operation
string buffered = GeometryUtil.BufferWkt(wkt, 5.0);

// Spatial relationship
string point = "POINT (5 5)";
bool contains = GeometryUtil.ContainsWkt(wkt, point);

// Area and length
double area = GeometryUtil.AreaWkt(wkt);
double length = GeometryUtil.LengthWkt(wkt);

// Topology validation
var geom = GeometryUtil.Wkt2Geometry(wkt);  // Returns OSGeo.OGR.Geometry
var validationResult = GeometryUtil.IsValid(geom);
if (!validationResult.IsValid)
{
    Console.WriteLine($"Geometry is invalid: {validationResult.ErrorMessage}");
}

// Note: Direct GeoJSON string parsing is not supported
// Use WKT format or load GeoJSON from files using GdalReader

Reading and Writing Data

using OpenGIS.Utils.DataSource;
using OpenGIS.Utils.Engine.Enums;

// Read from Shapefile
var layer = OguLayerUtil.ReadLayer(
    DataFormatType.SHP,
    "data/cities.shp"
);

// Write to GeoJSON
OguLayerUtil.WriteLayer(
    DataFormatType.GEOJSON,
    layer,
    "output/cities.geojson"
);

// Read with spatial filter
var filtered = OguLayerUtil.ReadLayer(
    DataFormatType.SHP,
    "data/cities.shp",
    spatialFilterWkt: "POLYGON ((...))"
);

Coordinate Transformation

using OpenGIS.Utils.Engine.Util;

// Transform coordinates from WGS84 to CGCS2000
string wkt = "POINT (116.404 39.915)";
string transformed = CrsUtil.Transform(wkt, 4326, 4490);

// Get zone number from longitude
int zone = CrsUtil.GetDh(116.404);  // 3-degree zone
int zone6 = CrsUtil.GetDh6(116.404); // 6-degree zone

// Get projected coordinate system WKID
int wkid = CrsUtil.GetProjectedWkid(39);  // CGCS2000 3-degree zone 39

Utility Functions

using OpenGIS.Utils.Utils;

// Encoding detection
var encoding = EncodingUtil.GetFileEncoding("data.txt");
var content = File.ReadAllText("data.txt", encoding);

// Natural sorting
var files = new[] { "file1.txt", "file10.txt", "file2.txt" };
var sorted = SortUtil.NaturalSort(files, f => f);
// Result: file1.txt, file2.txt, file10.txt

// Number formatting (avoid scientific notation)
string formatted = NumUtil.GetPlainString(0.00000123);

// ZIP compression
ZipUtil.Zip("folder/", "output.zip");
ZipUtil.Unzip("output.zip", "extracted/");

GDAL Configuration

GDAL is automatically configured on first use:

using OpenGIS.Utils.Configuration;

// Get GDAL version
string version = GdalConfiguration.GetGdalVersion();
Console.WriteLine($"GDAL Version: {version}");

// Check driver availability
bool hasFileGDB = GdalConfiguration.IsDriverAvailable("FileGDB");
Console.WriteLine($"FileGDB Support: {hasFileGDB}");

// List all supported drivers
var drivers = GdalConfiguration.GetSupportedDrivers();
foreach (var driver in drivers)
{
    Console.WriteLine($"- {driver}");
}

API Reference

All public APIs are fully documented with XML documentation comments including:

  • Detailed parameter descriptions
  • Return value explanations
  • Exception conditions
  • Usage examples for key methods

Core Classes

  • OguLayer - Unified GIS layer with fields and features
  • OguFeature - Feature with geometry (WKT) and attributes
  • OguField - Field definition with data type and constraints
  • OguFieldValue - Type-safe field value container with conversion methods

Geometry Processing

  • GeometryUtil - Comprehensive spatial operations:
    • Format conversion (WKT ↔ GeoJSON)
    • Spatial analysis (buffer, intersection, union, difference)
    • Spatial relationships (contains, intersects, touches, etc.)
    • Measurements (area, length, centroid)
    • Topology validation

Data I/O

  • OguLayerUtil - High-level data reading/writing
  • GdalReader / GdalWriter - GDAL-based I/O operations
  • ShpUtil - Shapefile-specific utilities (encoding, repair)

Coordinate Systems

  • CrsUtil - Coordinate transformation and zone calculations
    • WGS84, CGCS2000, and custom CRS support
    • EPSG code handling
    • Zone number calculations for Chinese coordinate systems

Utilities

  • EncodingUtil - Automatic encoding detection (UTF-8, GBK, GB2312)
  • ZipUtil - ZIP compression and extraction
  • SortUtil - Natural sorting for filenames with numbers
  • NumUtil - Number formatting without scientific notation

Project Structure

OpenGIS.Utils/
├── Engine/
│   ├── Enums/             # Geometry types, field types, format types
│   ├── IO/                # Reader/Writer interfaces
│   ├── Model/
│   │   └── Layer/         # OguLayer, OguFeature, OguField, etc.
│   └── Util/              # CrsUtil, ShpUtil, OgrUtil, etc.
├── Exception/             # Custom exception types
├── Geometry/              # GeometryUtil for spatial operations
├── Utils/                 # ZipUtil, EncodingUtil, SortUtil, NumUtil
├── DataSource/            # OguLayerUtil for unified data access
└── Configuration/         # GdalConfiguration, LibrarySettings

Dependencies

Requirements

  • .NET Standard 2.0 or higher
  • Compatible with .NET Core 2.0+, .NET 5+, .NET Framework 4.6.1+

Documentation

All public APIs include comprehensive XML documentation with:

  • Parameter descriptions - Clear explanation of each parameter
  • Return values - What the method returns
  • Exceptions - When and why exceptions are thrown
  • Examples - Code samples for common use cases
  • Remarks - Implementation details and important notes

IntelliSense in Visual Studio and other IDEs will display this documentation automatically.

License

Licensed under LGPL-2.1-or-later, consistent with the Java version.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Links

中文

项目概述

OpenGIS Utils for .NET (OGU4Net) 是基于 MaxRev.Gdal.Universal 的 .NET GIS 二次开发工具库。提供统一的图层模型和便捷的格式转换功能，简化 GIS 数据的读取、处理和导出操作。

本项目是 opengis-utils-for-java 的完整 C# .NET Standard 2.0 移植版本。

主要特性

  • 🎯 统一图层模型：简洁一致的 OguLayer、OguFeature、OguField 抽象，屏蔽底层 GIS 库差异
  • 🔄 格式转换：Shapefile、GeoJSON、FileGDB、PostGIS、GeoPackage、KML、DXF、TXT 等格式无缝转换
  • 🌐 坐标系支持：基于 GDAL/OGR 的全面坐标系转换，内置 CGCS2000 支持
  • 📐 几何处理：丰富的空间操作，包括缓冲区、交集、并集、拓扑验证等
  • 🔧 GDAL 架构：所有操作均由 GDAL/OGR 提供支持，确保最大兼容性和性能
  • 📦 跨平台：通过 .NET Standard 2.0 支持 Windows、Linux 和 macOS
  • 🛠️ 实用工具：编码检测、ZIP 压缩、自然排序、数字格式化

安装

dotnet add package OpenGIS.Utils

或通过 NuGet 包管理器：

Install-Package OpenGIS.Utils

快速开始

基本图层操作

using OpenGIS.Utils.Engine.Model.Layer;
using OpenGIS.Utils.Engine.Enums;

// 创建新图层
var layer = new OguLayer
{
    Name = "我的图层",
    GeometryType = GeometryType.POINT,
    Wkid = 4326
};

// 添加字段
layer.AddField(new OguField
{
    Name = "ID",
    DataType = FieldDataType.INTEGER
});

layer.AddField(new OguField
{
    Name = "名称",
    DataType = FieldDataType.STRING,
    Length = 50
});

// 添加要素
var feature = new OguFeature
{
    Fid = 1,
    Wkt = "POINT (116.404 39.915)"
};
feature.SetValue("ID", 1);
feature.SetValue("名称", "北京");
layer.AddFeature(feature);

// 验证图层
layer.Validate();

Console.WriteLine($"图层 '{layer.Name}' 有 {layer.GetFeatureCount()} 个要素");

几何操作

using OpenGIS.Utils.Geometry;

// WKT 转 GeoJSON
string wkt = "POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0))";
string geojson = GeometryUtil.Wkt2Geojson(wkt);

// 缓冲区分析
string buffered = GeometryUtil.BufferWkt(wkt, 5.0);

// 空间关系判断
string point = "POINT (5 5)";
bool contains = GeometryUtil.ContainsWkt(wkt, point);

// 面积和长度
double area = GeometryUtil.AreaWkt(wkt);
double length = GeometryUtil.LengthWkt(wkt);

// 拓扑验证
var geom = GeometryUtil.Wkt2Geometry(wkt);  // 返回 OSGeo.OGR.Geometry
var validationResult = GeometryUtil.IsValid(geom);
if (!validationResult.IsValid)
{
    Console.WriteLine($"几何对象无效: {validationResult.ErrorMessage}");
}

// 注意：不支持直接解析 GeoJSON 字符串
// 请使用 WKT 格式或通过 GdalReader 从文件加载 GeoJSON

数据读写

using OpenGIS.Utils.DataSource;
using OpenGIS.Utils.Engine.Enums;

// 从 Shapefile 读取
var layer = OguLayerUtil.ReadLayer(
    DataFormatType.SHP,
    "data/cities.shp"
);

// 写入到 GeoJSON
OguLayerUtil.WriteLayer(
    DataFormatType.GEOJSON,
    layer,
    "output/cities.geojson"
);

// 使用空间过滤读取
var filtered = OguLayerUtil.ReadLayer(
    DataFormatType.SHP,
    "data/cities.shp",
    spatialFilterWkt: "POLYGON ((...))"
);

坐标转换

using OpenGIS.Utils.Engine.Util;

// WGS84 转 CGCS2000
string wkt = "POINT (116.404 39.915)";
string transformed = CrsUtil.Transform(wkt, 4326, 4490);

// 根据经度获取带号
int zone = CrsUtil.GetDh(116.404);  // 3度带
int zone6 = CrsUtil.GetDh6(116.404); // 6度带

// 获取投影坐标系 WKID
int wkid = CrsUtil.GetProjectedWkid(39);  // CGCS2000 3度带第39带

实用工具函数

using OpenGIS.Utils.Utils;

// 编码检测
var encoding = EncodingUtil.GetFileEncoding("data.txt");
var content = File.ReadAllText("data.txt", encoding);

// 自然排序
var files = new[] { "file1.txt", "file10.txt", "file2.txt" };
var sorted = SortUtil.NaturalSort(files, f => f);
// 结果: file1.txt, file2.txt, file10.txt

// 数字格式化（避免科学计数法）
string formatted = NumUtil.GetPlainString(0.00000123);

// ZIP 压缩
ZipUtil.Zip("folder/", "output.zip");
ZipUtil.Unzip("output.zip", "extracted/");

GDAL 配置

GDAL 在首次使用时自动配置：

using OpenGIS.Utils.Configuration;

// 获取 GDAL 版本
string version = GdalConfiguration.GetGdalVersion();
Console.WriteLine($"GDAL 版本: {version}");

// 检查驱动可用性
bool hasFileGDB = GdalConfiguration.IsDriverAvailable("FileGDB");
Console.WriteLine($"FileGDB 支持: {hasFileGDB}");

// 列出所有支持的驱动
var drivers = GdalConfiguration.GetSupportedDrivers();
foreach (var driver in drivers)
{
    Console.WriteLine($"- {driver}");
}

API 参考

所有公共 API 都包含完整的 XML 文档注释，包括：

  • 详细的参数说明
  • 返回值解释
  • 异常条件说明
  • 关键方法的使用示例

核心类

  • OguLayer - 统一的 GIS 图层，包含字段和要素
  • OguFeature - 要素，包含几何（WKT）和属性
  • OguField - 字段定义，包含数据类型和约束
  • OguFieldValue - 类型安全的字段值容器，提供转换方法

几何处理

  • GeometryUtil - 全面的空间操作：
    • 格式转换（WKT ↔ GeoJSON）
    • 空间分析（缓冲区、交集、并集、差集）
    • 空间关系（包含、相交、接触等）
    • 测量（面积、长度、质心）
    • 拓扑验证

数据 I/O

  • OguLayerUtil - 高级数据读写
  • GdalReader / GdalWriter - 基于 GDAL 的 I/O 操作
  • ShpUtil - Shapefile 专用工具（编码、修复）

坐标系统

  • CrsUtil - 坐标转换和分带计算
    • 支持 WGS84、CGCS2000 和自定义坐标系
    • EPSG 代码处理
    • 中国坐标系统的带号计算

实用工具

  • EncodingUtil - 自动编码检测（UTF-8、GBK、GB2312）
  • ZipUtil - ZIP 压缩和解压
  • SortUtil - 文件名自然排序（支持数字）
  • NumUtil - 数字格式化（避免科学计数法）

项目结构

OpenGIS.Utils/
├── Engine/
│   ├── Enums/             # 几何类型、字段类型、格式类型
│   ├── IO/                # 读写器接口
│   ├── Model/
│   │   └── Layer/         # OguLayer、OguFeature、OguField 等
│   └── Util/              # CrsUtil、ShpUtil、OgrUtil 等
├── Exception/             # 自定义异常类型
├── Geometry/              # GeometryUtil 空间操作
├── Utils/                 # ZipUtil、EncodingUtil、SortUtil、NumUtil
├── DataSource/            # OguLayerUtil 统一数据访问
└── Configuration/         # GdalConfiguration、LibrarySettings

依赖项

环境要求

  • .NET Standard 2.0 或更高版本
  • 兼容 .NET Core 2.0+、.NET 5+、.NET Framework 4.6.1+

文档说明

所有公共 API 都包含完整的 XML 文档注释：

  • 参数说明 - 每个参数的清晰解释
  • 返回值 - 方法返回的内容
  • 异常 - 何时以及为什么会抛出异常
  • 示例 - 常见用例的代码示例
  • 备注 - 实现细节和重要说明

在 Visual Studio 和其他 IDE 中，IntelliSense 会自动显示这些文档。

许可证

采用 LGPL-2.1-or-later 许可证，与 Java 版本保持一致。

贡献

欢迎贡献！请随时提交 Pull Request。

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