Date (Creation)

2021-04-19

Citation identifier

gisco-services / https://gisco-services.ec.europa.eu/census/2021/INSPIRE/Data/CENSUS_INS21ES_A_PT_2021_0000

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Instituto Nacional de Estatística, IP, Gabinete Censos		paula.paulino@ine.pt	Owner

Keywords

• EUROSTAT metadata

GEMET - INSPIRE themes, version 1.0

• Population distribution — demography

Access constraints

Other restrictions

Other constraints

Public access to spatial data sets and services would adversely affect the confidentiality of the proceedings of public authorities, where such confidentiality is provided for by law.

Access constraints

Other restrictions

Other constraints

No conditions apply to access and use

Use constraints

Other restrictions

Other constraints

No conditions apply to access and use

Spatial representation type

Vector

Distance

1000  metres

Language

English

Topic category

• Society

Begin date

2021-04-19

Reference system identifier

ETRS89-extended / LAEA Europe

Distribution format

Name	Version
Geopackage file(.gpkg)
GML	3.2.1
Text	CSV
Text	SDMX

OnLine resource

Protocol	Linkage	Name
WMTS	https://gisco-services.ec.europa.eu/cmaps/service?REQUEST=GetCapabilities&SERVICE=WMTS	ViewService (WMTS) of the Census 2021 data

OnLine resource

Protocol	Linkage	Name
ATOM	https://gisco-services.ec.europa.eu/census/2021/INSPIRE/Data/PT_PD_3035_CSV.zip	The compressed resource (CSV) file contains data and metadata

OnLine resource

Protocol	Linkage	Name
ATOM	https://gisco-services.ec.europa.eu/census/2021/INSPIRE/Data/PT_PD_3035_GML.zip	The compressed resource (GML) file contains spatial data and metadata

OnLine resource

Protocol	Linkage	Name
ATOM	https://gisco-services.ec.europa.eu/census/2021/INSPIRE/Data/PT_PD_3035_GPKG.zip	The compressed resource (GPKG) file contains spatial data and metadata

OnLine resource

Protocol	Linkage	Name
ATOM	https://gisco-services.ec.europa.eu/census/2021/INSPIRE/Data/PT_PD_3035_SDMX.zip	The compressed resource (SDMX) file contains spatial data and metadata

OnLine resource

Protocol	Linkage	Name
ATOM	https://gisco-services.ec.europa.eu/census/2021/INSPIRE/PD.atom	Downloadservice (ATOM-Feed) of all the various packages

Hierarchy level

Dataset

Statement

Action programme for the 2021 Census - document providing a framework for the census operation and setting out the objectives, guidelines, variables to observe and a summary of the main activities to be combined for the performance of the census.The 2021 Census were carried out through an exhaustive survey, involving all persons residing in the country

The fieldwork followed the schedule shown below:

- Land reconnaissance by census takers; fill in the building questionnaire; distribution of letters with codes for response over the internet.

- Population response

- Conclusion of the census takers' intervention and the population's response.

The response to the Census was possible through the following modes:

• eCensos – electronic form for direct response by the population through the Internet; Available on multiple platforms: PC, tablet and smartphone;

• eBalcão – available at Parish Councils and with citizen support in response to Census;

• eRecensedor – application to support the function of the census taker, which allowed the response with the support of the census taker;

• Paper questionnaire;

• Answer by telephone, through the citizen helpline

After the collection was completed, the data validation phase began. The collected data were subject to a set of validations whose objective was to ensure the consistency of the information

In Portugal the grid data was computed using aggregation method, based in a point-based data model - the geographic coordinates of buildings. Aggregation was based on accurate locations of buildings (all census buildings are georeferenced) where the data buildings points were added up inside each grid cell. This is the most accurate approach and provides the best quality of grid data.

For guarantee the census accuracy, the quality control and evaluation program for the Census 2021 was based on the control of the entire statistical production process, through the verification and control of key processes, namely in the areas of human resources, fieldwork, data processing and its security, and finally, the completion of the post enumeration survey.

The methodology associated with the control and assessment of the productive process concentrated on identifying and monitoring key processes to guarantee effective performance of the fieldwork and the quality of the collected information.

An innovative process was designed to distribute throughout the dwellings an envelope containing a unique and non-transferable code to access the response to the 2021 Census via internet, preventing the duplication of responses. As the data collection of the 2021 Census took place under the COVID-19 pandemic, Statistics Portugal adopted the use of a strict Public Health Protocol and apply measures to create visibility and trust that would guarantee the fundamental participation of Society to respond to the Census. As a result of this unexpected context, Census has also introduced telephone collection of information, essentially aimed at population groups that find it more difficult to send a response via the web or were unable to be contacted face-to-face. Driven by the slogan: "Census count everyone. Everyone counts”, and adopting a truly inclusive attitude, Statistics Portugal made every effort so that everyone should be included in the 2021 Census, creating and using means to contact population hard to reach.

In terms of the fieldwork control, two procedures were applied to assess the quality of data collection:

- Resurvey a sample of dwellings (5%), carried out by Parish Coordinators/Sub-coordinators evaluating the accuracy of the dwellings occupation status, number of residents and address.

- Alert indicators system, which allowed monitoring of collection values by comparison with the expected results, with reference to different sources of information such as administrative data. Whenever deviations were identified, minding the established parameters, additional fieldwork verification procedures were triggered.

In addition, it was carried out, the 2021 Post Enumeration Survey, an autonomous and independent statistical operation during which some of the statistical units observed in the 2021 Census were re-surveyed.

The main aims of the PES were to assess errors in coverage and in content.The coverage analysis intends to obtain indicators on the quality of the results of the Censuses, for each Statistical Unit considered, to verify whether they were duly listed, wrongly listed or omitted.

At the national level, for conventional dwellings where estimated a coverage rate of 102.7% and for individuals the estimated coverage rate was 96.8%.

The content analysis focuses on the statistical unit Individual living in private households and main demographic characteristics: sex and age group. The PES revealed that for the sex variable, the consistency rate was 99.8%, and of 99.5% for age group.

The data processing phase included a set of processes to ensure integration and validation of information. The collected data were subject to a set of validations whose objective was to ensure the consistency of the information.

The validation processing process also included the incorporation and use of available administrative information and linking census to other data sources, and also with demographic indicators.

Final Census data were checked and considered credible and consistent with other data sourcesArticle 6 of Law No 22/2008 of 13 May 2008, laying down the principles, rules and structure of the national statistical system, refers to the principle of statistical confidentiality and states that all individual data concerning individuals or groups gathered by the statistical authorities are confidential in nature and may not be disseminated in such a way as to permit direct or indirect identification.

Article 19, "Confidentiality", of Decree-Law No 54/2019 of 18 abril 2019 (which lays down the rules to be obeyed by the 2021 Census) states that individual statistical data collected in the framework of the 2021 Census are subject to the principle of statistical confidentiality, constituting a professional secret for all persons who are involved in these statistical operations and have awareness of those data pursuant to Article 6 of Law No 22/2008 of 13 May 2008.In 2021 Census, with the purpose of protected the privacy of individuals and to ensure that your identity and characteristics are not obtained from the data disclosed, a statistical method was applied to control the disclosure of data, called “Targeted Record Swapping”. The application of this method guarantees that the total resident population and its main characteristics, remain unchanged for the different geographic levels.

Metadata

File identifier

CENSUS_INS21ES_A_PT_2021_0000 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2024-06-04T09:00:00

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Instituto Nacional de Estatística, IP, Gabinete Censos		paula.paulino@ine.pt	Point of contact