Influence zone generating is used in different fields: environmental studies, urban areas establishment, road construction and fire propagation. The influence zone is defined as the geometric space of the points that are at a shorter or similar distance to a given object (point, polyline or polygon). The simulation of the phenomena that are subject to constant patterns can be graphically represented by modules included in all commercial geographic information systems (GISs). In this case, the calculated zone is represented as a circle called isotropic buffer. Nevertheless, when we simulate processes as a liquid or a gas expansion, there are directional aspects that need to be considered. Directionality may be graphically represented as an ellipse. In this paper, we perform an analysis of how some of the most used commercially available GISs create influence zones and we highlight the lack of some of them to implement anisotropic or directional influence zones. In addition, we proposed a method to check the anisotropy and the creation of a generator oval that allows to delimit zones of influence that represent phenomena with anisotropic characteristics.

中文翻译：

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在商业GIS中表示影响区以模拟定向过程

影响区生成用于不同领域：环境研究，市区建设，道路建设和火灾蔓延。影响区定义为距给定对象（点，折线或多边形）更短或相似距离的点的几何空间。服从恒定模式的现象的仿真可以通过所有商业地理信息系统（GIS）中包含的模块以图形方式表示。在这种情况下，计算出的区域表示为一个称为各向同性缓冲区的圆。尽管如此，当我们将过程模拟为液体或气体膨胀时，仍需要考虑方向性。方向性可以图形地表示为椭圆。在本文中，我们对一些最常用的商业GIS如何创建影响区进行了分析，并强调了其中一些不足以实现各向异性或方向性影响区。此外，我们提出了一种检查各向异性的方法以及生成发生器椭圆的方法，该方法可以界定代表各向异性特征的现象的影响区域。