ACS Travel Time To Work Boundaries

Overview This feature service provides American Community Survey commuting data for U.S. administrative boundaries at the state, county, and census tract levels. It describes the number and share of workers age 16 and over who did not work from home, grouped by travel time to work intervals, along with associated margins of error. Feature Layers State — State-level boundary features with commute totals, commute-time distribution, percentage calculations, and geographic identifiers for each state. County — County boundary features with the same commute-time measures, linked to the state in which each county resides. Tract — Census tract boundary features with commute totals, commute-time distribution, percentage calculations, and state and county context for each tract. Geographic Coverage The service covers the United States and its constituent state, county, and census tract geographies. It is suited to statewide comparisons, county profiling, and tract-level neighborhood analysis. Use Cases Mapping commuting patterns and travel time distribution Comparing commute characteristics across states, counties, and neighborhoods Supporting transportation, workforce, and accessibility analysis Creating thematic maps and demographic dashboards based on American Community Survey estimates Data Notes The layers include estimate values and margins of error derived from American Community Survey travel-to-work statistics, supporting uncertainty-aware analysis and visualization.概述 本要素服务（feature service）提供针对美国州、县和普查区块组（census tract）三级行政边界的美国社区调查（American Community Survey）通勤数据。其涵盖16岁及以上非居家办公劳动者的数量与占比，按通勤时长区间分组，并附带对应的误差边际值。 要素图层 州级图层：包含各州通勤总量、通勤时长分布、占比计算结果及地理标识符的州级边界要素。 县级图层：包含与上述一致的通勤时长测算指标的县级边界要素，并关联至所属州。 区块组图层：包含各普查区块组的通勤总量、通勤时长分布、占比计算结果，以及所属州、县上下文信息的边界要素。 地理覆盖范围 本服务覆盖美国及其下辖的州、县与普查区块组地理单元，适用于州级对比、县级画像分析以及区块组级邻里区域分析。 应用场景 1. 绘制通勤模式与通勤时长分布地图 2. 对比各州、县及邻里区域的通勤特征 3. 支撑交通、劳动力与可达性分析 4. 基于美国社区调查估算结果制作专题地图与人口统计仪表板 数据说明 本图层包含源自美国社区调查通勤出行统计的估算值与误差边际值，可支撑考虑不确定性的分析与可视化工作。