Census Tract Top 50 American Community Survey Data

Data from: American Community Survey, 5-year Series King County, Washington census tracts with nonoverlapping vintages of the 5-year American Community Survey (ACS) estimates starting in 2010 of over 50 attributes of the most requested data derived from the U.S. Census Bureau's demographic profiles (DP02-DP05). Also includes the most recent release annually with the vintage identified in the "ACS Vintage" field. The census tract boundaries match the vintage of the ACS data (currently 2010 and 2020) so please note the geographic changes between the decades. Tracts have been coded as being within the City of Seattle as well as assigned to neighborhood groups called "Community Reporting Areas". These areas were created after the 2000 census to provide geographically consistent neighborhoods through time for reporting U.S. Census Bureau data. This is not an attempt to identify neighborhood boundaries as defined by neighborhoods themselves. Vintages: 2010, 2015, 2020, 2021, 2022, 2023, 2024 ACS Table(s): DP02, DP03, DP04, DP05 Data downloaded from: Census Bureau's Explore Census Data The United States Census Bureau's American Community Survey (ACS): About the Survey Geography & ACS Technical Documentation News & Updates This ready-to-use layer can be used within ArcGIS Pro, ArcGIS Online, its configurable apps, dashboards, Story Maps, custom apps, and mobile apps. Data can also be exported for offline workflows. Please cite the Census and ACS when using this data. Data Note from the Census: Data are based on a sample and are subject to sampling variability. The degree of uncertainty for an estimate arising from sampling variability is represented through the use of a margin of error. The value shown here is the 90 percent margin of error. The margin of error can be interpreted as providing a 90 percent probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of error (the lower and upper confidence bounds) contains the true value. In addition to sampling variability, the ACS estimates are subject to nonsampling error (for a discussion of nonsampling variability, see Accuracy of the Data). The effect of nonsampling error is not represented in these tables. Data Processing Notes: Boundaries come from the US Census TIGER geodatabases, specifically, the National Sub-State Geography Database (named tlgdb_(year)_a_us_substategeo.gdb). Boundaries are updated at the same time as the data updates (annually), and the boundary vintage appropriately matches the data vintage as specified by the Census. These are Census boundaries with water and/or coastlines erased for cartographic and mapping purposes. For census tracts, the water cutouts are derived from a subset of the 2020 Areal Hydrography boundaries offered by TIGER. Water bodies and rivers which are 50 million square meters or larger (mid to large sized water bodies) are erased from the tract level boundaries, as well as additional important features. For state and county boundaries, the water and coastlines are derived from the coastlines of the 2020 500k TIGER Cartographic Boundary Shapefiles. These are erased to more accurately portray the coastlines and Great Lakes. The original AWATER and ALAND fields are still available as attributes within the data table (units are square meters). The States layer contains 52 records - all US states, Washington D.C., and Puerto Rico Census tracts with no population that occur in areas of water, such as oceans, are removed from this data service (Census Tracts beginning with 99). Percentages and derived counts, and associated margins of error, are calculated values (that can be identified by the "_calc_" stub in the field name), and abide by the specifications defined by the American Community Survey. Field alias names were created based on the Table Shells file available from the American Community Survey Summary File Documentation page. Negative values (e.g., -4444...) have been set to null, with the exception of -5555... which has been set to zero. These negative values exist in the raw API data to indicate the following situations: The margin of error column indicates that either no sample observations or too few sample observations were available to compute a standard error and thus the margin of error. A statistical test is not appropriate. Either no sample observations or too few sample observations were available to compute an estimate, or a ratio of medians cannot be calculated because one or both of the median estimates falls in the lowest interval or upper interval of an open-ended distribution. The median falls in the lowest interval of an open-ended distribution, or in the upper interval of an open-ended distribution. A statistical test is not appropriate. The estimate is controlled. A statistical test for sampling variability is not appropriate. The data for this geographic area cannot be displayed because the number of sample cases is too small.数据来源：美国社区调查（American Community Survey, ACS）5年系列数据集。本数据集涵盖华盛顿州金县的普查区，采用2010年起的5年期ACS非重叠年份估算数据，包含源自美国人口普查局人口概况表（DP02-DP05）的50余项最常用属性指标。同时包含每年最新发布的数据集，年份信息标注于"ACS Vintage"字段中。 普查区边界与ACS数据年份保持一致（当前为2010年与2020年版本），请注意十年间的地理边界变更情况。普查区已被标记为西雅图市内区域，并被分配至名为"社区报告区（Community Reporting Areas）"的邻里群组。此类区域于2000年人口普查后设立，旨在为美国人口普查局数据的跨年度报告提供地理一致的邻里范围，并非用于还原居民自行定义的邻里边界。 数据集年份：2010、2015、2020、2021、2022、2023、2024 ACS数据表：DP02、DP03、DP04、DP05 数据下载自：人口普查局「探索普查数据」平台、美国人口普查局美国社区调查（ACS）：调查概况、地理信息与ACS技术文档、新闻与更新。 本数据集为可直接使用的图层，可在ArcGIS Pro、ArcGIS Online及其配置型应用、仪表盘、故事地图（Story Maps）、自定义应用与移动应用中使用，也可导出用于离线工作流程。使用本数据时，请引用美国人口普查局与ACS数据集。 ### 人口普查局数据说明 本数据基于抽样调查，存在抽样变异性。抽样变异性带来的估算不确定性以误差边际（margin of error）表示。此处展示的为90%置信度的误差边际，其含义为：估算值加减误差边际所形成的区间（即置信上下限）有90%的概率包含真实数值。除抽样变异性外，ACS估算值还存在非抽样误差（非抽样变异性的讨论详见「数据准确性」章节），此类误差的影响未在本表中体现。 ### 数据处理说明 边界数据源自美国普查局TIGER地理数据库，具体为国家次州级地理数据库（命名格式为`tlgdb_(年份)_a_us_substategeo.gdb`）。边界随数据每年同步更新，且边界年份与普查局指定的数据年份完全匹配。为制图与绘图需求，本数据已去除普查区边界中的水体及海岸线：对于普查区，水体裁切基于TIGER提供的2020年面积水文边界子集，将面积≥5000万平方米的大中型水体及其他重要要素从普查区边界中移除；对于州与县级边界，水体及海岸线源自2020年50万比例尺TIGER制图边界形状文件的海岸线，以更精准地呈现海岸与五大湖区域。数据表格中仍保留原始的`AWATER`与`ALAND`字段（单位：平方米）。 州级图层包含52条记录，涵盖美国所有州、华盛顿哥伦比亚特区（Washington D.C.）及波多黎各（Puerto Rico）。本数据服务已移除海洋等水域区域内无人口的普查区（即以99开头的普查区）。 百分比、衍生计数及对应的误差边际均为计算值（可通过字段名中的"_calc_"标识识别），且符合ACS的规范。字段别名基于美国社区调查汇总文件文档页面提供的表壳文件生成。 字段中的负值（如"-4444..."）已被设置为空值，仅"-5555..."被设置为0。原始API数据中的此类负值用于表示以下情形： 1. 误差边际字段：无足够抽样观测值可计算标准误，因此无法得出误差边际，不适合进行统计检验； 2. 无足够抽样观测值可计算估算值，或因其中一个或两个中位数估算值落入开放分布的最低或最高区间，无法计算中位数比值； 3. 中位数落入开放分布的最低或最高区间； 4. 不适合进行统计检验； 5. 估算值已被控制，不适合进行抽样变异性统计检验； 6. 因抽样案例数量过少，无法展示该地理区域的数据。