[Qgis-user] Hot Spot Accumulation

Thu Sep 27 07:19:59 PDT 2018

Hi Gillen, 

As far as I know, the point cluster renderer outputs points according to
cluster size and can be styled according to classes/rules. So it could
do what you want - I think. Have you tried it? 

If you also want to see the individual points in addition - then just
render the same layer twice: 

 	* once with indiviual points
 	* and once with the clustered points (point size and colors according
to nr of points in cluster) in the background

Greetings, 

Andreas 

On 2018-09-27 15:47, GILLEN Finbar wrote:

> Hi Andreas, 
> 
> The cluster renderer seems to dissolve points into 1 rather than create a radius for each individual point. The output would be something like below where I aggregate points within a certain radius, then I can highlight ones that have the highest density. 
> 
> The heatmap plugin does something like this, but I would prefer the output below if available. 
> 
> Regards 
> 
> Finbar 
> 
> FROM: Andreas Neumann <a.neumann at carto.net> 
> SENT: 27 September 2018 13:17
> TO: GILLEN Finbar <finbar.gillen at axa.ie>
> CC: Nicolas Cadieux <nicolas.cadieux at archeotec.ca>; qgis-user at lists.osgeo.org
> SUBJECT: Re: [Qgis-user] Hot Spot Accumulation 
> 
> Hi Gillen, 
> 
> Perhaps you are looking for the cluster renderer? 
> 
> See https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#point-cluster-renderer [1] 
> 
> or 
> 
> https://anitagraser.com/2017/06/13/even-more-aggregations-qgis-point-cluster-renderer/ [2] 
> 
> Greetings, 
> 
> Andreas 
> 
> On 2018-09-27 13:53, GILLEN Finbar wrote: 
> 
> Hi Nicolas, 
> 
> I checked that but it doesn't create a singular circle for each point. In more dense areas it will merge the circles as one. 
> 
> I would be looking for an individual circle for each point. 
> 
> Regards 
> 
> Finbar 
> 
> FROM: Nicolas Cadieux <nicolas.cadieux at archeotec.ca> 
> SENT: 27 September 2018 12:51
> TO: GILLEN Finbar <finbar.gillen at axa.ie>
> CC: qgis-user at lists.osgeo.org
> SUBJECT: Re: [Qgis-user] Hot Spot Accumulation 
> 
> Hi, 
> 
> I believe heat map will do that. You can use weight from field. 
> 
> http://www.qgistutorials.com/fr/docs/creating_heatmaps.html [3] 
> 
> Nicolas 
> 
> Le 27 sept. 2018 à 07:42, GILLEN Finbar <finbar.gillen at axa.ie> a écrit : 
> 
> Hi All, 
> 
> Is there a plugin or tool within QGIS that creates a hotspot for each individual point in a dataset and assigns a score based on the amount of points that fall within a given radius, say 200 metres (See image below)? 
> 
> <image001.png> 
> 
> I would be looking to weight the score with a variable within the dataset to. 
> 
> Regards 
> 
> Finbar 
> 
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confidential and intended only for the named addressees. Dissemination,
forwarding, publication or other use of the message or attachments by
any unauthorised person is strictly prohibited.

Unless stated to the contrary, any opinions expressed in this message
are personal and may not be attributed to AXA Insurance dac or any
member of the AXA Group of Companies.

AXA Insurance dac is regulated by the Central Bank of Ireland. For
business in Northern Ireland, AXA Insurance dac is authorised by the
Central Bank of Ireland and subject to limited regulation by the
Financial Conduct Authority. Details about the extent of our regulation
by the Financial Conduct Authority are available from us on request. AXA
Insurance dac is a private company limited by shares, registered in
Ireland number 136155. Registered Office Wolfe Tone House, Wolfe Tone
Street, Dublin 1.

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Internet e-mails are not necessarily secure. AXA Group does not accept
responsibility for changes made to this message after it was sent. To
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Links:
------
[1]
https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#point-cluster-renderer
[2]
https://anitagraser.com/2017/06/13/even-more-aggregations-qgis-point-cluster-renderer/
[3] http://www.qgistutorials.com/fr/docs/creating_heatmaps.html
[4] https://lists.osgeo.org/mailman/listinfo/qgis-user
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