The project " knowledge graphs " was started in 1992 as a joint activity of the faculty of sociology of the university of groningen and the faculty of applied mathematics of the university of twente in the netherlands 知识图项目起始于荷兰groningen大学与twente大学的一个联合项目,己经在专家系统方面取得了一些成果。这是一种全新的遥感图像目标识别方法。