Output Area (2001) to Output Area (2011) to LAD (2011) Best Fit Lookup in EW

A best fit lookup file between Output Areas (OA) as at December 2001 and OAs and local authority districts (LAD) as at December 2011 in England and Wales. This product has been provided with a 'change indicator' field that defines the lookup between 2001 and 2011 OAs. This field indicates which OAs / Super Output Areas (SOA) have changed between 2001 and 2011. There are 4 designated categories to describe the changes, and these are as follows: - U - No change from 2001 to 2011. This means that direct comparisons can be made between these 2001 and 2011 OAs. - S - Split. This means that the 2001 OA has been split into two or more 2011 OAs. There will be one record for each of the 2011 OAs that the 2001 OA has been split into. This means direct comparisons can be made between estimates for the single 2001 OA and the estimates from the aggregated 2011 OAs. - M - Merged. 2001 OAs have been merged with another one or more 2001 OAs to form a single 2011 OA. This means direct comparisons can be made between the aggregated 2001 OAs’ estimates and the single 2011 OA’s estimates. - X - The relationship between 2001 and 2011 OA is irregular and fragmented. This has occurred where 2001 OAs have been redesigned because of LAD boundary changes, or to improve their social homogeneity. These can’t be easily mapped to equivalent 2011 OAs like the regular splits (S) and merges (M), and therefore like for like comparisons of estimates for 2001 OAs and 2011 OAs are not possible. Each 2001 OA with an ‘X’ code is best-fitted to a 2011 OA by plotting the 2001 OA’s centroid into a 2011 OA boundary. However, this does not imply an exclusive 1:1 relationship with a 2011 OA, as it will also have a relationship with fragments of other 2011 OAs; the lookup is provided here so that all 2001 OA are included in the lookup. (File Size 10MB). Field Names – OA01CD, OA01CDO, OA11CD, CHGIND, LAD11CD, LAD11NM, LAD11NMW Field Types – Text, Text, Text, Text, Text, Text, Text Field Lengths – 9, 10, 9, 1, 9, 36, 36 REST URL of Feature Access Service – https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/OA01_OA11_LAD11_EW_LU_4ba063a6b6ce40ab8faf4d6453662a08/FeatureServer For more information and an overview of best-fitting follow this link - https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about英格兰与威尔士地区2001年12月的输出区域（Output Areas, OA）与2011年12月的输出区域及地方行政区（Local Authority Districts, LAD）之间的最佳匹配查找文件。 本数据集附带「变化标识」字段，用于界定2001与2011版输出区域的匹配关系，该字段可标识出2001至2011年间发生变更的输出区域/超级输出区域（Super Output Areas, SOA）。 本次变更共设有四类标准分类，具体如下： - U：2001至2011年间无任何变更。此类区域可直接开展2001版与2011版输出区域的对比分析。 - S：拆分。即2001版单个输出区域被拆分为2个及以上的2011版输出区域。针对每个拆分得到的2011版输出区域，均存在一条对应记录。此时可将2001版单个区域的统计估算值，与聚合后的2011版拆分区域的统计估算值进行直接对比。 - M：合并。即2001版的一个或多个输出区域被合并为单个2011版输出区域。此时可将聚合后的2001版区域的统计估算值，与2011版单个区域的统计估算值进行直接对比。 - X：关系不规则且碎片化。该类变更源于地方行政区边界调整或为提升区域社会同质性而对2001版输出区域进行的重新规划。此类区域无法像常规拆分（S）与合并（M）类区域那样，便捷地匹配到对应的2011版输出区域，因此无法直接开展2001与2011版输出区域统计估算值的对应对比。 对于标记为「X」的2001版输出区域，本数据集通过将2001版输出区域的质心投射至2011版输出区域边界的方式，实现其与2011版区域的最佳匹配。但该匹配并非严格的一对一专属关系，此类区域同时也会与其他2011版输出区域的片段存在关联；本次提供的匹配文件可确保所有2001版输出区域均被纳入匹配范围。（文件大小：10MB） 字段名称：OA01CD、OA01CDO、OA11CD、CHGIND、LAD11CD、LAD11NM、LAD11NMW 字段类型：均为文本（Text）型 各字段长度依次为：9、10、9、1、9、36、36 要素访问服务的REST地址：https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/OA01_OA11_LAD11_EW_LU_4ba063a6b6ce40ab8faf4d6453662a08/FeatureServer 如需了解最佳匹配方法的更多信息及概述，请访问以下链接：https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about