[OSGeo Africa] SA NLC class shifts per StatsSA region

[Chris Berens]

Hello listers,

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 Informal
Settlement Support Programme
<https://www.westerncape.gov.za/general-publication/informal-settlement-support-programme-issp-2016-western-cape>
to provide information for state planning purposes in this fluid
environment.

Together with OpenUp <https://openup.org.za/> we aim to take the  Wazimap
<https://wazimap.co.za/profiles/province-WC-western-cape/> 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.

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 QGIS <https://qgis.org/en/site/> 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.

Where I would like some help is in identifying a source for topologically
correct Census 2011 geography.

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.

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.

Kind regards,
Chris Berens

-- 
Chris Berens, Pr.GISc
SAGC No.1308
+27 (0)82 567 9322
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