gis and register -based statistics, address registers … · gis and register -based statistics ......
TRANSCRIPT
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.
2
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)
5
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
7
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)
9
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.
13
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
15
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
26
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
27
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)
28
UPDATEOF ADDRESS POINTS AND BUILDING
DATABASES
14
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