GIS Systemfor

Enumeration Areas Planning

CSB of Latvia in cooperation with State Land Service of Latvia

European Forum for Geostatistics 2008 WorkshopBled, Slovenia

October 1 – 3, 2008

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PROBLEM !

• Forthcoming Population Census 2011 in Latvia will be carried out in a classical way but using modern technology

• 2000 enumerators equipped with laptops will collect census data within 2000 enumeration areas

• How to split the territory of Latvia in 2000 enumeration areas keeping in each area an exact number of people(~1150 ) and avoiding natural obstacles (rivers, railways, motorways...)within the areas???

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LATVIA

BASIC STATISTICAL INDICATORS:

Total area – 64.6 thousand sq.km

Population – 2.3 million

Districts – 26

Municipalities – 530

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23 11

24 25

23 30

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20 21

24 16

24

25 15

17 16 18

19

20 13

19

29 18

14

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SOLUTION!

• Use GIS developed in accordance with the requirements elaborated by Experts of CSB• Use standard commercial GIS tools for development• Use data from existing information sources (administrative registers listed below) available and integrate it within the System

Population Register State Address Register (adress data and administrative boundaries map)Real estate state cadastre information system (Building Part and Cadastral Map)State Maps with different scale for rural(10000) and urban(2000) areas

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Main requirementsfor

the GIS development

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General requirements

• Multiuser system with user friendly interface

• System should be built up on the bases of GRID technology(definition of different cell size to be possible)

• System should Ensure: Development , maintenance, upgrade of enumeration areas

for population census as well as for the samples creation for social statistics needs,

Quick recalculation of the areas on the user demand (in case of density changes)

Linking one or several areas to an enumerator/interviewer Visual analysis of the enumeration/survey process

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System components functionality

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Addresses

• List of Addresses should be created and connected to the address points on the map

• Information from administrative sources to be used

• Address information from the list should appear by clicking to each adress point on the map

• It should contain information for the address points on the map (Name, personal ID, territory code, address code, Building ID code, status etc.)

• Filtering by each address field from the address list should be enabled

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• The territory consisting from one or several grid cells which involves the set of addresses to be linked to one enumerator should be

calculated taking into account requirements as follows:

Ensure automated grouping of the grid units thus making enumeration areas taking into account of natural obstacles like rivers, motorways, railways

Administrative boundaries

One of two – exceeding of enumeration area limitations or population number limit, dependently which happens first,

Warning message on the screen should be generated in case when number of people living in one building exceeds population number limit of the enumeration area

Enumeration areas (1)

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Enumeration areas (2)

• System software should ensure both - transition from Vector map to Grid and vice versa

• Automatical assigning of the enumeration areas to particullar enumerators should be ensured taking into account address of the each exact enumerator

• Enumeration areas would be possible to reassign to other enumerator by drag and drop on the map

• Particular addresses can be taken out of one enumeration area and put into other area

• Particular addresses could be assigned to a particular enumerators no mater in which enumeration area the address was

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• Functionality of the component have to ensure visual presenting of information how samples made covers the enumeration areas. Sample coverage analysis is essential for social statistics sampling process

• Data must be viewable by using web browser thus not limiting number of system users to some desktop software

• By taking collection statuses from data enumerators fieldwork systems the System should show them on the map

Visualisation

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Functionality of the component have to ensure export of the results – enumerators linked to enumeration areas, addresses and people, with defined data structure as:

• Tab delimited

• Text qualifier

• Columns in formats csv or mdb

Data export

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Work with maps

• System have to ensure automatic preparation of maps containing information for each of enumerators: address points on the map, address details by clicking on the point.

• Zooming possibilities

• Maps should be saved as PDF files

• Maps should be printable from the screens

• Enumerator/interviewer have to be able add the current status of interview for each address on the map(new,disrupted, completed, ...)

• To have a possibility to add or dellete informative layers on the map

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System Platform

• Intergraph Geomedia

• Microsoft SQL server 2005

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THANK YOU FOR ATTENTION!

• Karlis Zeila - Vice President, CSB of Latvia

Karlis.Zeila@csb.gov.lv

• Signe Rudzite – Deputy Director, Department of Cadastre and Registers, SLS

of Latvia

Signe.Rudzite@vzd.gov.lv