Google Earth Engine ——全球行政单位层（GAUL）国家-省/州-县级层面（含简化面）数据集

The Global Administrative Unit Layers (GAUL) compiles and disseminates the best available information on administrative units for all the countries in the world, providing a contribution to the standardization of the spatial dataset representing administrative units. The GAUL always maintains global layers with a unified coding system at country, first (e.g. departments), and second administrative levels (e.g. districts). Where data is available, it provides layers on a country by country basis down to third, fourth, and lowers levels. The overall methodology consists in a) collecting the best available data from most reliable sources, b) establishing validation periods of the geographic features (when possible), c) adding selected data to the global layer based on the last country boundaries map provided by the UN Cartographic Unit (UNCS), d) generating codes using GAUL Coding System, and e) distribute data to the users (see Technical Aspects of the GAUL Distribution Set. Note that some administrative units are multipolygon features.

全球行政单位层（GAUL）汇编和传播了世界上所有国家行政单位的最佳可用信息，为代表行政单位的空间数据集的标准化做出了贡献。GAUL始终在国家、第一行政级别（如省）和第二行政级别（如区）维护具有统一编码系统的全球层。在有数据的地方，它提供逐个国家的图层，直至第三、第四和更低的级别。整个方法包括：a）从最可靠的来源收集最好的可用数据，b）建立地理特征的验证期（如果可能的话），c）根据联合国制图单位（UNCS）提供的最新国界图将选定的数据添加到全球层，d）使用GAUL编码系统生成代码，e）向用户分发数据（见GAUL分发集的技术方面。请注意，一些行政单位是多多边形的特征。

Dataset Availability

2014-12-19T16:45:00 - 2014-12-19T00:00:00

Dataset Provider

FAO UN

Collection Snippet

ee.FeatureCollection("FAO/GAUL/2015/level2")

500米分辨率简化后的行政区：

Dataset Availability

2014-12-19T16:45:00 - 2014-12-19T00:00:00

Dataset Provider

FAO UN

Collection Snippet

ee.FeatureCollection("FAO/GAUL_SIMPLIFIED_500m/2015/level2")

代码：

var dataset = ee.FeatureCollection("FAO/GAUL/2015/level2");
Map.setCenter(12.876, 42.682, 5);
var styleParams = {
  fillColor: 'b5ffb4',
  color: '00909F',
  width: 1.0,
};
dataset = dataset.style(styleParams);
Map.addLayer(dataset, {}, 'Second Level Administrative Units');