<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Chris<div class=""><br class=""></div><div class="">Great initiative</div><div class=""><br class=""></div><div class="">I would push the custodians of each dataset to fix the source data they supply else complain to the CSI to hold the custodians to account. And in the meantime just fix it yourself. Taking it through GRASS’s v.clean process will clean it and build perfect topology. </div><div class=""><br class=""></div><div class="">For the SAL that would be StatsSA and for place names I’m not sure who the definitive custodian is or if it’s a combination of StatsSA, NGI, DWA and DAC. DAC is the custodian of geographical place names (e.g. <a href="https://www.gov.za/services/place-live/change-names-geographical-names-list" class="">https://www.gov.za/services/place-live/change-names-geographical-names-list</a>) and used to maintain a gazetteer - I had a copy many years ago at the CSIR. Back then it was in a spreadsheet that I had to phone around to have someone send me, which you’d probably still have to do since a link I found, which is where I’d expect it to be, is down: http://<em class="">sagns</em>.<a href="http://dac.gov" class="">dac.gov</a>.<wbr class="">za/</div><div class=""><br class=""></div><div class="">Gavin</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 02 Sep 2019, at 12:03, Chris Berens <<a href="mailto:chris@mapland.co.za" class="">chris@mapland.co.za</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello listers,<div class=""><br class=""></div><div class="">I feel like things change fast in this sector. The tools we use and the content we work with are both rivers of change. Currently I am working with a group of NGOs engaged with the Western Cape Government's <a href="https://www.westerncape.gov.za/general-publication/informal-settlement-support-programme-issp-2016-western-cape" target="_blank" class="">Informal Settlement Support Programme</a> to provide information for state planning purposes in this fluid environment.</div><div class=""><br class=""></div><div class="">Together with <a href="https://openup.org.za/" target="_blank" class="">OpenUp</a> we aim to take the <a href="https://wazimap.co.za/profiles/province-WC-western-cape/" target="_blank" class="">Wazimap</a> web census platform down to settlement level (currently you can only drill down to ward level), add a PDF report export function and ultimately a user interface.</div><div class=""><br class=""></div><div class="">One extra element that we are adding is a Land Use Land Class change analysis graphic and tabular report by region with the smallest building block being the Census Small Area Layer (SAL). In other words provide a current local context to the 2011 Census data by presenting the Level 2 urban LULC class prevalence from the 2000, 2013 and 2018 NLC layers. We are mostly using <a href="https://qgis.org/en/site/" target="_blank" class="">QGIS</a> for our layer preparations and the new Zonal histogram tool (available since v3.2) rips through this task quite smartly. If there is a better tool in the FOSS4G stable then let's hear about it too.</div><div class=""><br class=""></div><div class="">Where I would like some help is in identifying a source for topologically correct Census 2011 geography. </div><div class=""><br class=""></div><div class="">The set I have from StatsSA have dozens of problematic sub-place objects (I haven't run the SAL yet). QGIS3 can skip past corrupt objects which is great but we'd rather go for gold.</div><div class=""><br class=""></div><div class="">Another input which would be welcome is knowledge of current gazetteers which might identify the names of settlements at a sub sub-place level. The old DWAF Communities layer was such a source. Just not sure if it has been kept updated.</div><div class=""><br class=""></div><div class="">Kind regards,</div><div class="">Chris Berens</div><div class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="m_393531938371919617m_2831744046438459505gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><font size="1" class="">Chris Berens, Pr.GISc<br class=""></font></div><div class=""><font size="1" class=""><span style="font-family: Arial, sans-serif;" class="">SAGC No.1308</span><br class=""></font></div><div class=""><font size="1" class="">+27 (0)82 567 9322</font></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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