USA Railroad Density

Railroad data is represented by the physical class of railroad, i.e., gauge or type of track, which provides a basis for understanding how that track is used; and by the owner. Railroads represent proximity to human activity on the landscape, and conversely, the farther away a place is from roads, the lower the likelihood that it is disturbed by human activity. Railroad right-of-ways frequently provide refuge for wildlife and plants and act both as barriers and sometimes corridors for wildlife. Dataset Summary This layer contains a raster density surface of railroads from the U.S. Census Bureau's TIGER database. The cell size is 1 kilometer and the values represent railroad density based on the sum of the length of all railroads in each 1 km cell. This layer covers the continental U.S., Alaska, Hawaii, and Puerto Rico. What can you do with this layer? The layer is restricted to an 24,000 x 24,000 pixel limit for these services, which represents an area roughly the size of North America. This layer is part of a larger collection of landscape layers that you can use to perform a wide variety of mapping and analysis tasks.铁路数据通过铁路的物理类别（即轨道轨距或类型）以及所有者信息进行表征，该类别可作为理解轨道使用方式的依据。铁路可体现某区域与人类活动的邻近程度；反之，某地点距道路越远，其受到人类活动干扰的可能性便越低。铁路用地常为野生生物与植物提供庇护所，同时兼具野生动物阻隔屏障与迁徙通道的双重功能。 数据集摘要：本图层源自美国人口普查局的TIGER数据库，包含铁路栅格密度表面数据。其栅格像元尺寸为1千米，栅格值代表每1平方千米单元格内所有铁路总长度对应的铁路密度。本图层覆盖美国本土、阿拉斯加、夏威夷及波多黎各全境。 可通过本图层开展哪些工作？本服务对该图层设置了24000×24000像素的使用限制，对应区域面积大致等同于北美地区的规模。本图层隶属于更大范围的景观图层集合，可用于执行各类制图与分析任务。