Eurostat

THE CONTRACTOR IS ACTING UNDER A FRAMEWORK CONTRACT CONCLUDED WITH THE COMMISSION

GIS and register-based statistics, address registers and building registers (PL)

Janusz DygaszewiczCentral Statistical Office of Poland

ESTP “Administrative data and censuses” Wiesbaden (30 May – 1 June 2017)

• Nowadays the development process of obtaining and providing statistical information to a large extent is based on its spatial reference.

• In Poland in 2010 Census Round a combination of data coming from administrative sources and register containing spatial data was used for the first time.

• For that purpose, the reference geodetic data obtained from the State geodetic and cartographic resources, contained: • Administrative division borders, • Geographical Names,• Topographic Data Base, • Cadastral Data, • Ortophotomapwere used.

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GIS in Polish official statistics

Information technologies

Reference geodeticmaps

Computer visualisation of spatial

databases

Integration statistics and geodetic data

Statistical data

What we had (2009)

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Statistical address pointsand building location

address locations for buildings with dwellings

needed for spatial analysis of census data in Poland

• to navigate enumerators

• to visualize census results on maps 6

Spatial address database

Statistical addresspoints• address points for

dwelling locations(only)

Statistical divisionboundaries• Statistical regions• Census areas

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With the use of the reference materials obtained, both from geodetic and statistical resources, it was possible to conduct field surveys and develop sampling frames for surveys and censuses, comprising statistical address points and their spatial reference.

The TERYT system as the basis for

geocoding of address register and building register

on x,y coordinates

Territorial identification registry (TERYT)

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Adding spatialinformation

to various levelsof the territorial

identification registry

The structure of the identifier of the three-tier territorial division of the country

X - region XX - voivodship

XX - subregionXX - powiat

XX - gminax - type of gmina

Where types of gmina are market in the following manner:• 1 - urban gmina, • 2 - rural gmina, • 3 - urban-rural gmina, • 4 - city within an urban-rural gmina, • 5- rural area within an urban-rural gmina, • 8 - quarters of the Warszawa-Centrum gmina, • 9 - quarters and representations of other urban gminas.

Spatial address point Identification system

Best practice of geocoding• Collect statistical data with reference to an address points

(the best!) or smallest enumeration area (EA);• All address points are referenced to pair of x,y coordinates;• Geocode as precisely as it is possible; • Official statistics no longer limited to publishing data for

administrative o statistical units;• New possible divisions of space (grids or any choosen area)• Spatial analyses on precisely geocoded microdata.

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x,y GEOCODING• Territorial Identification Registry (System TERYT)

provides location data of all statistical units as theaddress-point of a related building

• Location of buildings is specified using geographicalx,y coordinates, giving the exact location of eachbuilding and make possibility to linking microdatafrom several registers.

x,y coordinates and address points

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Classification of the analyses conducted by addresspoints with x,y coordinates gives also the possibility to become independent from boundaries changes (in the administrative division of the country), usually resulting in changes of census districts and laborious recalculations.

This facilitates a comparative analysis of time series, regardless of the changes taking place in this division.

Changing the classification allowing spatial analysis andmore flexible grouping of data for the smallest areas.

It make it possible carrying out of spatial analyses of various phenomena concerning for instance:

– demography (e.g. the average distance between children’s and parents’ residence, commuting to work, school, distance to hospital etc.),

– urbanisation and planning (e.g. useful in determining the boundaries of urban agglomerations, metropolies, and the drawing up of land development plans),

– agriculture and environment (analysing the structure of crops, environmental pollution),

– the economy (e.g. analysing the effects of burdensome road and industry investments).

x,y GEOCODING

This eliminate not only the necessity to recalculate data when administrative boundaries are changing but also allowing easy aggregation and processing of statistical data in any chosen area -even for the GRID – based dissemination,

x,y geocoding is crucial in all three stages of the census: • the preparatory works, • management of enumerators during the fields works, • and for multidimensional spatial analysis.

Three different approaches for geocoding address register and building register

• Though the concept of a point-based geocoding framework is generic and the principles of the framework will be the same cross countries, the production setup based on such a framework may differ between countries due to various traditions in data collection and responsibility between institutions involved.

• According to GEOSTAT-2 project we have three approaches:

“In-house” - both location data and statistical data are collected and managed completely

within the NSI

The “hybrid” - location data is collected and managed outside the NSI but statistical data

within

The “data broker” - both location data and statistical data are collected and

managed outside the NSI

Keeping address points and building databases up to date using

GIS

(update from registers, local governments actions and pre-census survey with GPS devices)

SoftwareArcGIS 9.3.1• ArcInfo• ArcEditor• ArcView

Geodatabases• personal• file

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Address point acquisition – pilot project

BUILDING THE GIS

4 municipalities selectedfor the Trial AgriculturalCensus 2010

statistical division bordersand address point acquisition

reference material qualityassessment

assessment of time neededfor a nationwide operation

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Address point acquisition

BUILDING THE GIS

scanningand

calibrationof statistical

maps

digitizationof statistical

divisionborders

(statisticalregions and

census areas)

automatic address point

extractionfrom cadastral

data

manualaddress point

acquisition(with

situationsketches

as primaryreference)

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UPDATEOF ADDRESS POINTS AND BUILDING

DATABASES

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Statistical address point database update in cooperation with municipalities on the website basis

3 weeks internet map service provided by CSO on-line application for spatial address point

database editing printouts still available in case of bad internet

connection