Output Area (2011) to Ward (2011) to LAD (December 2011) Best Fit Lookup in EW
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<span style='font-size:17px; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif !important;'>A best fit lookup between Output Areas (OA), wards and local authority districts (LAD) as at 31 December 2011 in England and Wales. </span><div style='font-size:17px; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif !important;'><br /></div><div style='font-size:17px; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif !important;'>This lookup has been provided with a 'small population indicator' field. This field indicates those wards which have a very small population. There are two designated categories to describe the changes, - 0 - normal population, - 1 - very small population. Where a ward is smaller than an OA and therefore does not contain any OA population weighted centroids, the ward is allocated to the OA with its population weighted centroid nearest to any part of the ward. Information on the percentage of an OA’s population that falls into the higher geography has also been included in this best-fit lookup file. This ‘best-fit percentage' indicator has been calculated by working out the percentage of the OA’s population that falls exactly within the output geography. In the case of the OA to Ward lookup three OAs have a 0% of their population in the ward to which they are allocated. The affected OA are E00071944, E00120017 and E00026547, and all are the result of the wards not aligning with the 2001 OAs. The OAs with less than 100% of their population within their allocated ward are because of the process of 'best-fitting' by which they were allocated. Each OA was assigned to a single ward on the basis of its population weighted centroid. This meant that for statistical purposes, an OA had all of its counts assigned to that ward, even if the reality was that the geographic area may have covered several wards. This is why the 'percentage best-fit match' was created - the percentage of an OAs actual population that fell within its allocated ward rather than the total population of the OA that is used for statistical purposes. This was designed to help statistical users better understand the best-fitting process. (File Size 11.6MB).</div><div style='font-size:17px; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif !important;'><p style='margin-bottom:0cm; margin-bottom:.0001pt;'><span style='font-size:11.5pt; font-family:Helvetica, sans-serif;'>Field Names – OA11CD, WD11CD, WD11NM, WD11NMW, SMPOPIND, PERCENTAGE_BF, LAD11CD, LAD11NM, LAD11NMW</span></p> <p style='margin-bottom:0cm; margin-bottom:.0001pt;'><span style='font-size:11.5pt; font-family:Helvetica, sans-serif;'>Field Types – Text, Text, Text, Text, </span><span style='font-family:Helvetica, sans-serif; font-size:15.3333px;'>Text, Text, Text, Text, Text</span></p> <p style='margin-bottom:0cm; margin-bottom:.0001pt;'><span style='font-size:11.5pt; font-family:Helvetica, sans-serif;'>Field Lengths – 9, 9, 56, 56, 1, 3, 9, 36, 36</span></p></div><div>REST URL of Feature Access Service – <a href='https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/OA11_WD11_LAD11_EW_LU_c4b4fca58da744d49f0300d9fba8afc2/FeatureServer' target='_blank' rel='nofollow ugc noopener noreferrer'>https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/OA11_WD11_LAD11_EW_LU_c4b4fca58da744d49f0300d9fba8afc2/FeatureServer</a></div> <br /><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif;'><font size='3'>For more information and an overview of best-fitting follow this link - </font></span><div><a href='https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about' target='_blank' rel='nofollow ugc noopener noreferrer'>https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about</a><div></div></div>
本数据集为英格兰及威尔士地区截至2011年12月31日的输出区域（Output Areas, OA）、选区与地方当局辖区（Local Authority Districts, LAD）之间的最优匹配对照表。 本对照表附带「人口规模较小标识」字段，用于标记人口规模极小的选区。该字段设有两类预设取值：0表示常规人口规模，1表示人口规模极小。当选区面积小于输出区域，且未包含任何输出区域的人口加权质心时，该选区将被划归至人口加权质心与其辖区任意区域距离最近的输出区域。 本最优匹配对照表还包含了输出区域人口落入上级地理单元的占比信息。此处的「最优匹配百分比」指标，通过计算输出区域人口中恰好落入其对应输出地理范围的比例得出。在输出区域与选区的匹配对照表中，共有3个输出区域的全部人口均未落入其匹配的选区内，受影响的输出区域编号为E00071944、E00120017与E00026547，此类情况均源于选区与2001年版输出区域未完全对齐。 部分输出区域的人口未100%落入匹配选区，这是由其匹配所采用的「最优匹配」流程导致的：每个输出区域均基于其人口加权质心被分配至单个选区，这意味着在统计层面，该输出区域的全部统计值都会被归入对应选区，即便其实际地理范围可能覆盖多个选区。正因如此，「最优匹配百分比」指标应运而生——该指标统计的是输出区域实际人口中落入匹配选区的占比，而非统计用途中默认的输出区域总人口占比，旨在帮助统计使用者更好地理解最优匹配流程。（文件大小：11.6MB） 字段名称：OA11CD、WD11CD、WD11NM、WD11NMW、SMPOPIND、PERCENTAGE_BF、LAD11CD、LAD11NM、LAD11NMW 字段类型：文本、文本、文本、文本、文本、文本、文本、文本、文本 字段长度：9、9、56、56、1、3、9、36、36 要素访问服务的REST URL：https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/OA11_WD11_LAD11_EW_LU_c4b4fca58da744d49f0300d9fba8afc2/FeatureServer 如需了解更多最优匹配相关信息及概述，请访问以下链接：https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about
