[OSGeo Africa] Municipal boundary demarcation

Wed Jul 20 00:47:31 PDT 2016

Aslam,

Every time I have queried what appeared to be obvious errors in the data where it does not follow cadastral boundaries, I have been told by the Demarcation Board that the shapefiles are absolute and if a house is 1cm the other side, it’s another municipality. Since such limits are gazette, they in fact cannot be altered, even to fit the obvious cadastral boundary. They don’t gazette the properties, but the map.

Thousands of people have lost out on receiving houses in Housing programs because of such bad ward delineation practices. 

Regards

Peter

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Chris Berens
Sent: Wednesday, July 20, 2016 9:27 AM
To: Africa local chapter discussions <africa at lists.osgeo.org>
Subject: Re: [OSGeo Africa] Municipal boundary demarcation

Hi Aslam,

The DB is still posting the 2011 Ward boundaries at that eddress.  The coastal polys from Mtubatuba northwards still have that 6200 m extension into the Indian Ocean.  This must have fuzzed a lot of density calcs over the years.  Is there a name for this aberration yet?  There by Kou-kamma in the south the sea-grab is 1000 m. Are there other issues besides the generally crude adherence to natural boundaries? Do they fit the cadastres? Yes, we can all just fix it but great if there was a reliable source dataset.

Regards,

Chris

Chris Berens, GISc

www.mapland.co.za <http://www.mapland.co.za> 

+27 (0)82 567 9322

On 20 July 2016 at 08:37, Aslam Parker <Aslam.Parker at drdlr.gov.za <mailto:Aslam.Parker at drdlr.gov.za> > wrote:

Dear Colleagues

The Municipal Demarcation Board  <http://www.demarcation.org.za/> http://www.demarcation.org.za/  is the only authoritative source of Demarcation data in South Africa

The Board’s mandate derives from:

The Constitution Of The Republic Of South Africa, 1996 (Act No 108 Of 1996). 

The Board is mandated in terms of section 155(3)(b) to determine municipal Boundaries independently. 

Local Government: Municipal Demarcation Act, 1998 (Act No 27 Of 1998)

The latest boundary data (shapefiles) can be downloaded from http://www.demarcation.org.za/index.php/downloads/boundary-data 

We are also encouraged to carefully scrutinise the Section 21 of the Local Government: Municipal Demarcation Act 27 of 1998 the Municipal Demarcation Board which graphically shows re-determined the municipal boundaries.  In most cases the boundary changes seems small and insignificant, but can have significant socio-political, as well as planning implications. http://www.demarcation.org.za/site/?page_id=14588  

A Good example :

“  In terms of Section 21 of the Local Government: Municipal Demarcation Act 27 of 1998 the Municipal Demarcation Board has re-determined the municipal boundaries of Mnquma Local Municipality (EC122) and Mbhashe Local M unicipality (EC121) , by excluding the Administrative areas of Mhlahlana, Nkonkwana,KwaMente, and KwaNkanga from the municipal area of Mnquma Local Municipality (EC122), and by including them into the municipal area of Mbhashe Local M unicipality (EC121).” The example map can be accessed  at http://www.demarcation.org.za/index.php/municipal-boundaries/section-21-maps-and-notices/ec-sec21-dems/1104-dem4037-bpfc-sec21/file 

Aslam Parker | Director: Geo-spatial Information and Professional Support |Chief Directorate: National Geo-spatial Information | Department of Rural Development and Land Reform |  <http://www.ngi.gov.za/> www.ngi.gov.za| Cape Town|

Tel +27 21 658 4302 <tel:%2B27%2021%20658%204302> | Fax +27 21 689 1351 <tel:%2B27%2021%20689%201351> | Mobile 082 331 8501| aslam.parker at drdlr.gov.za <mailto:aslam.parker at drdlr.gov.za> 

From: Africa [mailto:africa-bounces at lists.osgeo.org <mailto:africa-bounces at lists.osgeo.org> ] On Behalf Of Lydia du Toit
Sent: 20 July 2016 07:44 AM
To: Africa local chapter discussions
Subject: Re: [OSGeo Africa] Municipal boundary demarcation

Hi Chris, 

Contact the Demarcation Board, or download from their website.

They have the 2011 and 2016 boundaries available.

Regards

Lydia Du Toit (Pr GISc)
Mobile: 0832713158
Email: Lydiadt at mweb.co.za <mailto:Lydiadt at mweb.co.za>  or

From: Chris Kirchhoff <mailto:chris at kirchhoffsurveyors.co.za>  

Sent: Wednesday, July 20, 2016 5:41 AM

To: 'Africa local chapter discussions' <mailto:africa at lists.osgeo.org>  

Subject: [OSGeo Africa] Municipal boundary demarcation

Hi

Is there a formal/ legal source of municipal boundary positions especially for boundary between Johannesburg and Tshwane municipalities 

Thanks

Chris

……………………………………...

Chris Kirchhoff
Professional Land Surveyor
Tel : 082-773 4868
 <mailto:chris at kirchhoffsurveyors.co.za> chris at kirchhoffsurveyors.co.za
 <http://www.kirchhoffsurveyors.co.za/> www.kirchhoffsurveyors.co.za

We believe good spatial information leads to superior planning, diminished project risks, improved feasibility assessments and efficient resource utilisation.

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Gavin Fleming
Sent: 19 July 2016 11:13 AM
To: africa at lists.osgeo.org <mailto:africa at lists.osgeo.org> 
Subject: Re: [OSGeo Africa] QGIS splitting lines at intersections

On 19/07/2016 11:05, Zoltan wrote:

Hi Gavin,
I did see the one using "another layer", but that is problematic as when one is digitising (say) a town road network you would want to honour the straightness of the roads and then intersect them afterwards.

If you're doing it while digitising I would rather set up snapping perfectly then node intersections while digitising. As simple as stopping a line and starting a new one instead of just clicking a vertex at an intersection. 

Hence "popping out" to other facilities just messes up your work-flow.

Will look at the scripting options  - for now this is just a training exercise in teaching digitising principals.

Thanks & keep well,
Zoltan

-- 

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Gavin Fleming - Joint MD - PrGISc [PGP1234]

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