sorry to mess you about Rita!

http://webcache.googleusercontent.com/search?q=cache:Nn1pYTK...


These five indicators can be considered as the top priorities according to the policy makers and they cover all the inequality domains.

With the use of a desktop GIS (ArcGIS) a selection of 2001 census variables was used to construct and map the five selected indicators. The spatial detail of the census data is determined by the boundaries of each census tract (“fracción censal”). They are established so that the population in each is approximately of 13,500 people, regardless of its geographic size. The National Institute of Statistics and Censuses from Argentina (INDEC) divides each census tract into 15 smaller units called “radio censal” with a population of approximately 900 people. These “radios censales” are built up from individual blocks (“manzanas”) but the data is not available to the public at that level of disaggregation.

Figure 1: Block groups ("radios censales")


As shown in Figure 1, tracts are formed of an average of 15 block groups (“radios censales”). There are 901 Blocks groups in Rosario with and average of 1015 People in each. The following are the resulting GIS-based indicators constructed at block group level. The best off areas are shown in white and the worst off areas in black. A spatial patterning of inequality can be found in the city of Rosario with a concentration of needs in certain areas (See Figures 2 and 3).


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Note added at 1 day2 hrs (2011-06-08 17:54:52 GMT)
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so

this is a term specific to Argentina:)

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Note added at 1 day2 hrs (2011-06-08 17:57:22 GMT)
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or even

census block group

ADOLEC-Desigualdades en salud y desigualdades sociales: un ... - [ Translate this page ]
by M Alazraqui - 2007 - Cited by 5 - Related articles
MÉTODOS: El trabajo se realizó en los 431 radios censales del municipio de ... were applied to study the 431 census block groups of the Lanús municipality ...
bases.bireme.br/cgi-bin/wxislind.../online/?...p... - Cached

Kindly double-check references, and cross-reference!


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Note added at 1 day22 hrs (2011-06-09 13:48:19 GMT)
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Hi Rita

Thank you for the further information!

Saludos y muy buenas!

Liz