[Qgis-user] Dot Density Symbology

[Hugh Kelley]

Thanks all for the conversation and helpful thoughts.

I finally had time this morning to read through and try things in qgis.

For a polygon or multipolygon in the symbology settings, the random Marker
fill seems to meet the need well. That should save me a lot of time!

Have a good weekend all.

On Thu, Jul 27, 2023 at 7:44 PM Shinoto, PD Dr. Maria via QGIS-User <
qgis-user at lists.osgeo.org> wrote:

> Oops, this was in my Spam folder. It seems that this is the solution to
> the problem. Thanks a lot!
> Maria
>
>
> Am 2023/07/28 um 08:04 schrieb Alexandre Neto <
> alexandre.neto at qcooperative.net>:
>
> Hello Hugh,
>
>
> https://docs.qgis.org/3.28/en/docs/user_manual/style_library/symbol_selector.html#random-marker-fill
>
> Check the random marker fill. I believe it's what you are looking for. As
> you can see in the docs, you can decide how many points you want to insert
> inside the polygon. This option can be derived of each feature attributes
>
> Best regards,
>
> Alexandre Neto
> User Support
> www.qcooperative.net
>
> A quinta, 27/07/2023, 18:27, C Hamilton via QGIS-User <
> qgis-user at lists.osgeo.org> escreveu:
>
>> This may not be an answer to your question, but the Density Analysis
>> plugin (https://plugins.qgis.org/plugins/densityanalysis/) will create a
>> uniform set of polygons over an area of interest with a NUMPOINTS attribute
>> of the number of points are contained within the polygon. The NUMPOINTS
>> value can be weighted using some other attribute. It will automatically
>> style the density map as well from a given color ramp.
>>
>> Calvin
>>
>> On Wed, Jul 26, 2023 at 8:06 PM Shinoto, PD Dr. Maria via QGIS-User <
>> qgis-user at lists.osgeo.org> wrote:
>>
>>> Hi,
>>>
>>> I have a similar research problem, and the dots seem to be a wonderful
>>> solution.
>>>
>>> So, this email does not give any assistance re the original question,
>>> just an answer to the question below:
>>>
>>> Am 2023/07/27 um 03:45 schrieb chris hermansen via QGIS-User <
>>> qgis-user at lists.osgeo.org>:
>>>
>>> Here's (apologies for the closed source link) an example of the type of
>>>> map/symbology I'm trying to describe.
>>>> https://www.arcgis.com/apps/mapviewer/index.html?webmap=30d2e10d4d694b3eb4dc4d2e58dbb5a5
>>>>
>>>> Thanks for any suggestions!
>>>>
>>>
>>> What about just shading the polygons using a gray scale?
>>>
>>> Given that your polygons should generate a uniform density of dots
>>> within the area they bound, I don't see value in generating the dots for
>>> symbology.
>>>
>>>
>>> The polygon area may vary, as it does in my research (distribution of
>>> burials in administrative areas). Therefore, a small area always looks
>>> underrepresented as compared to a larger area, and vice versa. I have large
>>> administrative areas with low densitiy, but they look well populated even
>>> with a very light shade of grey.
>>>
>>> So I would like to try to find a solution to Chris' problem since the
>>> representation with dots is closer to reality than colouring areas. I will
>>> report when I found a solution for my use case -- though this may be
>>> autumn...
>>>
>>> Maria
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-- 
Hugh Kelley
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