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<div class="moz-cite-prefix">Hi Herbert,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">The attribute table of the Centroids
file should have the cluster number as one of the attributes (let
me know if it doesn't). You can then do the following:</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">1) Add the X/Y coordinates to the
Centroids attribute table (from the menu bar select Vector >
Geometry Tools > Add Geometry Attributes).</div>
<div class="moz-cite-prefix">2) In the Layers panel, right-click on
the name of the new layer produced in step 1 (it will be something
like "Added geom info") and select "Export > Save features as".
Set the format to "Comma separated value" and save the file.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">That should do it.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Regards, Frank<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 2021/03/04 08:54, Herbert Chitate
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABsnB=B-py0DKQ5bMmfUm_UE+8LOUT55Wfoj-N2i2Fc6JuDs=g@mail.gmail.com">
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<div dir="ltr">Hi Frank,
<div><br>
</div>
<div>You are an absolute life saver. Almost there. So I managed
to generate the centroids. Thoroughly impressed for a new
user!!!</div>
<div><br>
</div>
<div>I have attached a screen shot of the results. </div>
<div><br>
</div>
<div>Final question though is how do I extract the lat and lon
of the centroids, into say a csv file with also a column with
the cluster number they belong to (cluster number is what i
used to demacate the different polygons in step 2 of your
instructions)</div>
<div><br>
</div>
<div>Many many many thanks</div>
<div><br>
</div>
<div>Much appreciated</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Herbert</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Mar 1, 2021 at 2:25 PM
Frank Sokolic via qgis-za-user <<a
href="mailto:qgis-za-user@lists.osgeo.org"
moz-do-not-send="true">qgis-za-user@lists.osgeo.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>Hi Herbert,</div>
<div><br>
</div>
<div>I haven't tested it but you could try something like
this:</div>
<div><br>
</div>
<div>1) Load the csv file into QGIS using the "Add Delimited
Text Layer" tool (Shift + Ctrl + T)</div>
<div>2) Use the "Minimum bounding geometry" tool to create a
polygon around each cluster (Processing Toolbox >
Vector geometry > Minimum bounding geometry)</div>
<div>3) Generate centroids for each polygon (Processing
Toolbox > Vector geometry > Centroids)</div>
<div><br>
</div>
<div>Hope this helps.</div>
<div><br>
</div>
<div>Regards, Frank.<br>
</div>
<div><br>
</div>
<div>On 2021/03/01 13:04, Herbert Chitate via qgis-za-user
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Good afternoon All,
<div><br>
</div>
<div>I am new to QGIS and was wondering if someone might
be able to assist me on an extraction I am trying to
do.</div>
<div><br>
</div>
<div>I have lat and lon details for about 1,500
locations, which using python (kmeans), I have
clustered the data into 20 clusters of which I have
the details of the constituent members (+ gps
locations) that make up the 20 clusters. Info now in a
CSV file.</div>
<div><br>
</div>
<div>How can I use QGIS to establish the lat and lon of
the centroids for each of the clusters?</div>
<div><br>
</div>
<div>Thank you for the assistance.</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Herbert</div>
</div>
<br>
<fieldset></fieldset>
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