JTS提供了一套操作几何向量的java类库
早期版本 com.vividsolutions，已废弃不在维护
现在版本 com.locationtech.jts 由eclipse开源基金会托管

GIS开发入门指导

jts-core核心类库使用说明
具体结合示例代码详细介绍JTS下面核心包下面的geometry、coordinate、wkb、wkt等操作使用说明

计算点到线的垂线
延线的画线方向，判断点在线的右侧还是左侧
线到线投影
根据起始点求一个线的子线
计算线上面距离点起点一定距离的交点坐标
扩buffer,左扩N米右扩N米
单位换算

JTS GitHub

核心模块:

• jts-core - 核心类库:提供geometry model, operations, algorithms, and spatial data structures
• jts-io-common - I/O classes for open spatial formats

The following modules depend on proprietary libraries, and are not built by default:

• jts-io-ora - Oracle reader and writer
• jts-io-sde - SDE reader and writer

The following modules are applications and data for testing and working with JTS

• jts-tests - The JTS XML test suite and the Test Runner application
• jts-app -The TestBuilder GUI, for working with JTS geometry interactively

<dependency>  
 <groupId>org.locationtech.jts</groupId> 
 <artifactId>jts-core</artifactId> 
 <version>1.16.1</version>
</dependency>