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<p><font size="-1">Morning David,</font></p>
<p><font size="-1">It may be that QGIS has considered your data
(Value-1) to be String rather than Numeric. <br>
</font></p>
<p><font size="-1">The way to check this is right click on the
layer, choose Properties and Fields. What type is your Value-1
field listed as?</font></p>
<p><font size="-1">If it is string, you can use the Refactor Tool to
change it to Numeric. See this example:</font></p>
<p><font size="-1">The Pop2018 column contains population data, but
QGIS thinks it is a String (text). QGIS then wouldn’t<br>
be able to display the data, or create a choropleth map with it.
We need to change the format from String<br>
(text) to Double (number).<br>
• Click Processing > Toolbox.<br>
3<br>
• Type Refactor in the search box.<br>
• Double click on Refactor fields it might take a little while
to load.<br>
• Make sure we have our new MidYearEstimates layer in the Input
Layer box.<br>
• Change our Pop2018 field from String to Double.<br>
• Click Run.<br>
• When it has finished running, click Close.<br>
This has added a new layer called Refactored. It has a little
memory chip icon next to it, which means<br>
it isn’t saved anywhere.<br>
• Check that the Refactored layer now has the population data in
the correct data type.<br>
</font></p>
<p><font size="-1">Once it is Numeric, it should be visible when you
setup a choropleth map. <br>
</font></p>
<p><font size="-1">Good luck and let us know how you get on!</font></p>
<p><font size="-1">Best wishes,<br>
Nick.<br>
</font></p>
<p><font size="-1"><br>
</font></p>
<p><font size="-1"></font><br>
</p>
<div class="moz-cite-prefix">On 13/07/2021 02:23, David Rhoads
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:db834359-2d08-e763-48d2-7fb1d55bab1c@dgrhoads.us">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Folks:<br>
<br>
Please help me. I am very frustrated. I recently downloaded the
current long-term release of QGIS (3.16.8). Two of you kindly
suggested documentation to get me started. One problem, the
documentation does not match the current shipping version of
QGIS. In one case, the documentation was for QGIS 1. In the
other case, while supposedly for QGIS 3.16, the screens in the
documentation do NOT match what I see in my version of QGIS (I'm
running Win 10).<br>
<br>
I am starting with a series of districts in a county. I want to
do choropleth mapping in those districts based on numeric values
in a CSV file. I am able to load the two layers, the districts
from an SHP file and the numeric values from the CSV file and then
to join them. When I try to generate the choropleth map, the name
of the field containing the numeric values does not show up when I
click on the Symbology tab. I can see that field in several other
tabs, but not in the Symbology tab.<br>
<br>
I expect there is an easy solution to this, but so far it has
eluded me.<br>
<br>
Attached are the Project file and the CSV file containing the data
(Value-1) to apply to the polygons. Join is done on the
PrecinctID column.<br>
<br>
David<br>
<br>
<div class="moz-cite-prefix">On 7/1/2021 1:20 AM, Evan Derickson
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPd=BqbU0s==2yhmpsfcW1eNf1VQtQEY7BYGQHuJMOTrsLzw3g@mail.gmail.com">
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charset=UTF-8">
<div dir="ltr">
<div dir="ltr">
<div dir="auto">Hi David,
<div dir="auto"><br>
</div>
<div>You can use the Graduated symbol renderer to make a
choropleth map. The official documentation on this is
at <a
href="https://docs.qgis.org/3.16/en/docs/gentle_gis_introduction/vector_attribute_data.html#graduated-symbols"
moz-do-not-send="true">https://docs.qgis.org/3.16/en/docs/gentle_gis_introduction/vector_attribute_data.html#graduated-symbols</a>,
but you may find something like <a
href="https://guides.library.duke.edu/QGIS/Symbolize"
moz-do-not-send="true">https://guides.library.duke.edu/QGIS/Symbolize</a>
to be more helpful.</div>
<div><br>
</div>
<div>Best,</div>
<div>Evan</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jun 30, 2021,
14:46 David Rhoads <<a
href="mailto:dgrhoads@dgrhoads.us" target="_blank"
moz-do-not-send="true">dgrhoads@dgrhoads.us</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">Does QGIS support
choropleth mapping (i.e. ability to apply colors to <br>
polygons depending on a numerical value associated with
each polygon)? <br>
Our application has to do with looking at the relative
statistics of <br>
voting precincts in Chester County, PA. We want to easily
find outliers.<br>
<br>
If so, where in the documentation is this described? I've
done some <br>
looking and have not been able to find anything related.<br>
<br>
Thanks,<br>
David Rhoads<br>
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</blockquote>
</div>
</div>
</blockquote>
<br>
<br>
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<pre class="moz-signature" cols="72">--
Nick Bearman
Tel / WhatsApp / Signal: +44 (0) 7717745715
<a class="moz-txt-link-abbreviated" href="mailto:nick@geospatialtrainingsolutions.co.uk">nick@geospatialtrainingsolutions.co.uk</a>
Due to my own life/work balance, you may get emails from me outside of normal working hours. Please do not feel any pressure to respond outside of your own working pattern.</pre>
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