[OSGeo Africa] Census Shape Files

[Gavin Fleming]

The CSIR GAP project went a long way to enabling merging and comparison 
of different spatial units by developing and implementing a methodology 
to aggregate or disaggregate statistics to a common 'mesozone' layer, 
consisting of tesellated polygons, each roughly 50 sq.km and each using 
existing common boundaries of component polygons where possible.

http://www.gap.csir.co.za/about-gap-1

I think a CSIR unit might still be keeping the project alive - again a 
case of a project that would have flown and been immensely useful if it 
had been open from the start.

Gavin


On 03/12/2012 11:01, Calle Hedberg wrote:
> Chris,
>
> Absolutely correct. While there might be good reasons for withholding
> certain types of socio-economic data (e.g. income) that potentially can be
> used to identify individual households (e.g. by criminals), there are no
> valid reasons for withholding the most useful EA data (population by
> single-year age groups and gender, water and sanitation, etc).
>
> I did extensive splitting of Small Area Layer polygons after 2003 to fit
> that data to the new municipality structure, and it's an effing pain -
> weighting by area don't cut it, you have to either combine it with a
> high-quality land use layer or you have to inspect each polygon manually
> using imagery or orthorectified photos since the majority of cross-border
> polygons tend to have a wide variation in population density.
>
> Regards
> Calle
>
> *******************************************
> Calle Hedberg
> Health Information Systems Programme - South Africa
> 46D Alma Road, 7700 Rosebank, SOUTH AFRICA
> Tel/fax (home): +27-21-685-6472
> Cell: +27-82-853-5352
> Email: chedberg at telkomsa.net
> Email2: calle.hedberg at gmail.com
> Skype: calle_hedberg
> *******************************************
>
>
>
> -----Original Message-----
> From: africa-bounces at lists.osgeo.org [mailto:africa-bounces at lists.osgeo.org]
> On Behalf Of Chris Berens
> Sent: 03 December 2012 10:44 AM
> To: chris at airphotoafrica.co.za; Africa local chapter discussions
> Subject: Re: [OSGeo Africa] Census Shape Files
>
> The non-alignment of public boundaries highlights the importance of
> releasing EA based statistics so as to allow for accurate re-districting.  I
> have not heard a coherent argument for withholding data at that level.  It
> is a fairly simple task to split sub-place polygons weighted by area but
> unlikely that each public entity will take the trouble.
>
> A bit like the annual SPOT purchase, massive SD infrastructure largely
> ignored by service providers due to inaccessible data format.
>
> On 3 December 2012 10:15, Chris <chris at airphotoafrica.co.za> wrote:
>>
>>      The SG has had a couple of projects along these lines
>>
>>      http://csg.dla.gov.za/05_15.htm
>>
>>      http://csg.dla.gov.za/scanpmb.htm
>>
>>      I have NO idea of the standards or format that these projects adhere
> to
>>      , or if they are of any use to thos interested in the Census data ?
>>
>>      Although I would think that they may be of some help in comparing land
>>      parcels ?
>>
>>      I would be interested to know if the spatial information pertaining to
>>      these projects and their resultant data sets are available ? ( ie can
>>      be downloaded or ordered standalone )
>>
>>
>>      CM
>>
>>
>>
>> On 3 Dec 2012 at 9:24, Adi Eyal wrote:
>>
>>> Perhaps a standardisation body exists?
>>> Adi
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-- 
Gavin Fleming
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