Maryland Archived American Community Survey Census Tracts 2009 to 2013

The American Community Survey (ACS) is a nationwide, continuous survey designed to provide communities with reliable and timely demographic, housing, social and economic data. The ACS replaces the decennial census long form in 2010 and every year thereafter. The annual ACS sample is smaller than that of previous long form surveys resulting in a larger sampling error. Coefficients of Variation (CVs), which are statistical measures that show the relative amount of sampling error associated with an estimate, are presented here as a measure of reliability and usability of the data. The unit of geography used for the 2009 - 2013 data is the census tract - a small statistical area within a county, which is delineated every 10 years prior to the decennial census. This is a MD iMAP hosted service. Find more information on https://imap.maryland.gov. Feature Service Link: https://mdgeodata.md.gov/archive/rest/services/Demographics/MD_ArchivedAmericanCommunitySurvey/FeatureServer/2美国社区调查（American Community Survey, ACS）是一项全国性持续性调查，旨在为各社区提供可靠且及时的人口统计、住房、社会与经济数据。该调查自2010年起取代十年一次人口普查的长表，并在此后每年持续开展。年度ACS样本规模小于此前的长表调查，因此抽样误差更大。变异系数（Coefficients of Variation, CVs）是用于表征与估算值相关联的抽样误差相对大小的统计指标，本次作为数据可靠性与可用性的衡量标准予以呈现。2009-2013年数据所采用的地理单元为人口普查片区（census tract）——隶属于县的小型统计区域，每十年在十年人口普查前完成划定。本数据集为MD iMAP托管服务。更多信息可访问https://imap.maryland.gov。要素服务链接：https://mdgeodata.md.gov/archive/rest/services/Demographics/MD_ArchivedAmericanCommunitySurvey/FeatureServer/2