Natural Earth Counties of the United States - larger scale

Polygon layer representing United States counties with name attributes. About Natural Earth Natural Earth is a convenient resource for creating custom maps. Unlike other map data intended for analysis or detailed government mapping, it is designed to meet the needs of cartographers and designers to make generalized maps. Maximum flexibility is a goal. Natural Earth is a public domain collection of map datasets available at 1:10 million (larger scale/more detailed), 1:50 million (medium scale/moderate detail), and 1:110 million (small scale/coarse detail) scales. It features tightly integrated vector and raster data to create a variety of visually pleasing, well-crafted maps with cartography or GIS software. Natural Earth data is made possible by many volunteers and supported by the North American Cartographic Information Society (NACIS). Convenience – Natural Earth solves a problem: finding suitable data for making small-scale maps. In a time when the web is awash in geospatial data, cartographers are forced to waste time sifting through confusing tangles of poorly attributed data to make clean, legible maps. Because your time is valuable, Natural Earth data comes ready to use. Neatness Counts–The carefully generalized linework maintains consistent, recognizable geographic shapes at 1:10m, 1:50m, and 1:110m scales. Natural Earth was built from the ground up, so you will find that all data layers align precisely with one another. For example, where rivers and country borders are one and the same, the lines are coincident. GIS Attributes – Natural Earth, however, is more than just a collection of pretty lines. The data attributes are equally important for mapmaking. Most data contain embedded feature names, which are ranked by relative importance. Other attributes facilitate faster map production, such as width attributes assigned to river segments for creating tapers. Intelligent data The attributes assigned to Natural Earth vectors make for efficient mapmaking. Most lines and areas contain embedded feature names, which are ranked by relative importance. Up to eight rankings per data theme allow easy custom map “mashups” to emphasize your subject while de-emphasizing reference features. Other attributes focus on map design. For example, width attributes assigned to rivers allow you to create tapered drainages. Assigning different colors to contiguous country polygons is another task made easier thanks to data attribution. Other key features Vector features include name attributes and bounding box extents. Know that the Rocky Mountains are larger than the Ozarks. Large polygons are split for more efficient data handling—such as bathymetric layers. Projection-friendly vectors precisely match at 180 degrees longitude. Lines contain enough data points for smooth bending in conic projections, but not so many that computer processing speed suffers. Raster data includes grayscale-shaded relief and cross-blended hypsometric tints derived from the latest NASA SRTM Plus elevation data and tailored to register with Natural Earth Vector. Optimized for use in web mapping applications, with built-in scale attributes to assist features to be shown at different zoom levels.表示附带名称属性的美国各县多边形图层。 关于自然地球（Natural Earth） 自然地球是一款用于制作自定义地图的便捷资源。与其他面向分析或精细政府制图的地图数据不同，它专为制图师与设计师制作概化地图的需求打造，核心目标是实现最大程度的灵活性。 自然地球是公共领域的地图数据集集合，提供三种比例尺版本：1:1000万（大比例尺/更精细）、1:5000万（中比例尺/中等精细度）与1:1.1亿（小比例尺/概化精度）。其集成了矢量数据（vector data）与栅格数据（raster data），可通过制图或地理信息系统（Geographic Information System, GIS）软件制作多种视觉美观、制作精良的地图。 自然地球的数据由众多志愿者贡献，并得到北美制图信息协会（North American Cartographic Information Society, NACIS）的支持。 便捷性 自然地球解决了一项痛点：寻找适用于小比例尺地图的合适数据。当下网络上充斥着各类地理空间数据，制图师往往需要耗费大量时间在杂乱无章、属性不完善的数据中筛选，才能制作出清晰易读的地图。鉴于您的时间宝贵，自然地球数据可直接投入使用。 整洁性 精心概化的线要素在1:10m、1:50m与1:110m比例尺下均能保持一致且易于识别的地理形态。自然地球是从头构建的数据集，因此所有数据图层之间均可精准对齐。例如，当河流与国家边界重合时，二者的线条完全重合。 GIS属性 不过自然地球不仅是美观的线条集合，其数据属性对制图同样至关重要。大多数数据都包含按相对重要性排序的要素名称，其他属性则可加快制图效率，例如为河段分配宽度属性以实现渐变效果。 智能数据 分配给自然地球矢量数据的属性可大幅提升制图效率。大多数线要素和面要素都包含按相对重要性排序的要素名称，每个数据主题最多支持八级排序，可轻松实现自定义地图"mashups"，突出主题要素同时弱化参考要素。其他属性则专注于地图设计，例如为河流分配宽度属性可实现渐变水系效果。通过属性标注，为相邻国家多边形分配不同颜色的任务也变得更为简单。 其他核心特性 矢量要素包含名称属性与边界框范围，可直观识别落基山脉（Rocky Mountains）相较于欧扎克山脉（Ozarks）的面积大小。大型多边形会被拆分以提升数据处理效率，例如水深图层（bathymetric layers）。 适配投影的矢量数据在180度经线处可实现精准匹配。线要素包含足够的数据点以在圆锥投影中实现平滑弯曲，但又不会因点数过多导致计算机处理速度下降。 栅格数据包括基于最新NASA SRTM Plus高程数据生成的灰度晕渲图与交叉融合式地势着色图，该数据经过定制可与自然地球矢量数据完美配准。 该数据集针对网络地图应用进行了优化，内置比例尺属性以辅助要素在不同缩放层级下的显示。