Oil and Gas Exploration and Production in the State of Indiana Shown as Quarter-Mile Cells

A cells polygon feature class was created by the U. S. Geological Survey (USGS) to illustrate the degree of exploration, type of production, and distribution of...美国地质调查局（U. S. Geological Survey, USGS）创建了一套单元格多边形要素类（cells polygon feature class），用于呈现……的勘探程度、生产类型及其分布情况。