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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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<div dir="ltr">
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<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>
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