ABS - Net Internal and Overseas Migration Estimates - by Age (SA3) 2017-2020

This dataset presents the estimates of the internal and overseas migration statistics of Australia by age by Statistical Area Level 3 (SA3) following the 2016 Australian Statistical Geography Standard (ASGS). The dataset spans from the 2016-17 financial year up to the 2019-20 financial year.\n\nOverseas migration is the movement of people from overseas to Australia's sub-state areas and vice-versa. It cannot be directly measured and is estimated by breaking down overseas migrant arrivals and departures at the state level to sub-state areas, using information from the most recent Census. The state-level overseas migration data is sourced from Department of Home Affairs processing systems, visa information, and incoming passenger cards, and is published in [National, state and territory population](https://www.abs.gov.au/statistics/people/population/national-state-and-territory-population/latest-release).\n\nInternal migration is the movement of people across a specified boundary within Australia involving a change in place of usual residence. It cannot be directly measured and is instead estimated using administrative data. The movement of people between and within Australia's states and territories cannot be directly measured and is estimated using administrative data. Internal migration is estimated based on a combination of Census data (usual address one year ago), Medicare change of address data (provided by Services Australia), and Department of Defence records (for military personnel only). \n\nThe Medicare source data is assigned to a state or territory and GCCSA for a person's departure and arrival locations, based on the postcodes of their residential addresses as registered with Medicare. Postcodes are assigned wholly to a state/territory and GCCSA based on best fit. Where a postcode is split across areas, it is assigned to the area that contains the majority of that postcode's population.\n\nFor more information please visit the [Regional population methodology](https://www.abs.gov.au/methodologies/regional-population-methodology/2019-20).\n\n AURIN has spatially enabled the [original data](https://explore.data.abs.gov.au/vis?tm=migration&pg=0&df[ds]=ABS_ABS_TOPICS&df[id]=ABS_REGIONAL_MIGRATION&df[ag]=ABS&df[vs]=1.0.0&pd=%2C&dq=9%2B6.SA3..TT%2B6599%2B4564%2B2544%2B1524%2B0014.A&ly[rs]=AGE&ly[rw]=ASGS_2016&ly[cl]=MIG_TYPE%2CTIME_PERIOD).

本数据集基于2016年澳大利亚统计地理标准（Australian Statistical Geography Standard, ASGS），提供了按年龄分组、按三级统计区域（Statistical Area Level 3, SA3）划分的澳大利亚国内及海外移民统计估算数据。数据集涵盖2016-17财年至2019-20财年。

海外移民指人员从海外迁入澳大利亚州以下区域，或反之。该类流动无法直接测量，需依托最新人口普查的相关信息，将州级海外移民入境、出境数据拆解至州以下区域以完成估算。州级海外移民数据来源于澳大利亚内政部处理系统、签证信息及入境旅客登记卡，相关数据已发布于《全国、州及领地人口》（https://www.abs.gov.au/statistics/people/population/national-state-and-territory-population/latest-release）。

国内移民指人员在澳大利亚境内跨越指定边界且变更常住居住地的人口流动。该类流动同样无法直接测量，需通过行政数据完成估算。澳大利亚各州及领地之间、州内的人口流动均无法直接测量，亦需通过行政数据进行估算。国内移民估算综合了三类数据源：人口普查数据（过去一年常住地址）、澳大利亚服务部提供的医保（Medicare）地址变更数据，以及国防部记录（仅针对军事人员）。

医保源数据会根据人员在医保系统登记的住宅地址邮编，将其出入境位置分配至对应的州/领地及首府城市统计区域（Greater Capital City Statistical Area, GCCSA）。邮编将通过最优匹配规则完全归属至某一州/领地及GCCSA；若某邮编跨区域拆分，则将其归属至包含该邮编多数人口的区域。

如需获取更多信息，请访问《区域人口统计方法》（https://www.abs.gov.au/methodologies/regional-population-methodology/2019-20）。

澳大利亚城市与区域研究基础设施网络（AURIN）已对[原始数据](https://explore.data.abs.gov.au/vis?tm=migration&pg=0&df[ds]=ABS_ABS_TOPICS&df[id]=ABS_REGIONAL_MIGRATION&df[ag]=ABS&df[vs]=1.0.0&pd=%2C&dq=9%2B6.SA3..TT%2B6599%2B4564%2B2544%2B1524%2B0014.A&ly[rs]=AGE&ly[rw]=ASGS_2016&ly[cl]=MIG_TYPE%2CTIME_PERIOD)完成空间启用处理。