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ESTP course on Geographic Information Systems (GIS): Use of GIS for making statistics in a production environmentStatistics Norway, Oslo, 26th to 30th of March 2012

Irena DudovaStatistics of Environment, Infrastructure and Regions Directorate/ Key Indicators for National and Regional Policies DepartmentJunior expertNational Statistical Institute2, P. Volov Str, Sofia 1038, BulgariaTel. +3592/ 9857531E-mail : idudova@nsi.bg

Bulgaria

- Status of use of GIS in production and dissemination of statistics -

Geospatial technologies first used for the Census 2001:

• To support census operations during the pre-enumeration

and enumeration phase (planning enumeration areas (EA),

printing enumerator maps and census lists)

• To provide quality maps to accompany census reports

• To carry out different analyses of data and analyses

visualization

Prepare digital base for settlementsVector layers for streets, addresses, control regions and enumeration areas.

Bind statistical information to basic digital mapsInformation from censuses about buildings, dwellings, population, and results from other social statistics surveys…It is open

Analyse data

Control sample distribution when different surveys

conducted

Prepare maps for statistical publications

Maps are extremely informative and persuasive tools

…and they may give further meaning to the data

We use GIS to:

GIS reduces the time and resources necessary for the organization of

statistical surveys and gives excellent tools for analysing and

presenting results

…But you must have quality digital spatial data to do so.

Yes, GIS helps, helps a lot!

Until 2005 – no source for digital maps of settlements exists

From 2006 we started receiving digital polygon layers for parcels and buildings

(town by town) from

Geodesy, Cartography and Cadaster Agency

The problems we find…

Lack of high resolution digital spatial base information

Differences in the structure and data formats of the

national databases

Incompleteness of information

Lack of resources (human and others…)

We have already built spatial database for 27 district cities

And we also have very interesting historical spatial data even for the first census conducted in Bulgaria in 1881

but…

We have no spatial web dissemination system

And that’s our big trouble

And the thing we are working upon…

Rules for handling confidentiality

We have no high spatial resolution data

No suppresion for current representation level

Policy with respect to licensing and pricing of statistics derived from use of GIS

Source must be acknowledged

Organisation and number of staff…

Until December 2011 -

Regional Statistics and GIS Department

at the Demographic and Social Statistics Directorate

From January 2012

Our team (4 persons) is part of the

Key Indicators for National and Regional Policies Department,

Statistics of Environment, Infrastructure and Regions Directorate

Software in use

ESRI ArcGIS 9.3 Desktop

Availability of basis geostatistical units (georeferenced- population, dwellings,

buildings)

Residential buildings address point layer

with id-links to

Dwellings and resident population

(appr. 50% of the total country population is georeferenced )

appr. 50% of the population is georeferenced

and also…

Streets linear layer

Control regions and enumeration areas – polygon layers

Districts - polygon

Municipalities - polygon

Settlements (area owned) – polygon

Statistical regions- polygon

THE PROJECTGEOSTAT 1B

TASKS:

Representing census data in European population grid on

resolution 1x1km

Improvement of methodologies

Unification of methods for presentation in the common

European grid

To provide qualitative data, the raw material for spatial analysis

Bulgarian NSI and

We are

Bulgarian NSI has not practical experience in:

•Grid presentations of statistics

•Disaggregation methods

We join directly at the second stage of the project (GEOSTAT 1B).

WHY?WHY?

ABSOLUTE BEGINNERS

creating a real demographic picture of the population

Bulgaria will apply mixed method ofaggregation and disaggregation In GEOSTAT1B

AND

Be Welcome to the 2013 conference of EFGS in Sofia, Bulgaria

Thank you!