[OSGeo Africa] Census Shape Files

Calle Hedberg chedberg at telkomsa.net
Mon Dec 3 01:01:35 PST 2012


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.


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
>     , 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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