Re: [Qgis-user] Buffer Algorithm (Buffer distance of output polygon is not equal to the Distance parameter)

[Ben Hur Pintor]

That's odd. I redid the entire thing just now (restarted QGIS, made scratch
point layer, created a 100m buffer) and the values I get are now correct.
Even the area computations were off in the first one but after redoing the
process, everything looks good.

 point-buffer2.png


Weird. Maybe I missed something during the first one. Hahaha.

Anyway, sorry for bothering you all.

Cheers!

On Thu, Sep 27, 2018 at 11:07 PM DelazJ  wrote:

> Hi,
> There might be more information in the *Info* drop-down menu. Expand it,
> please.
>
> Harrissou
>
> Le jeu. 27 sept. 2018 à 16:55, Ben Hur Pintor  a
> écrit :
>
>> Hi everyone.
>>
>> I apologize if this has been asked before but I would just like to
>> clarify if this is how the buffer algorithm in QGIS should function.
>>
>> *Issue:* The actual distance from the input layer to the buffer polygon
>> created by the Buffer processing tool (and v.buffer) is not equal (only
>> around 80%) to the Distance parameter provided in the said tool.
>>
>> *Example:* My coordinate reference system is WGS84/UTM Zone 51N (EPSG:
>> 32651). I create a 100m buffer around a point but when I measure the
>> resulting circle, its edge is only ~80m from the point (see buffer-point
>> and buffer-point-distance below).
>>
>>  buffer-point.png
>> 
>>
>>  buffer-point-distance.png
>> 
>>
>> I create a 50m buffer around a line but when I measure the resulting
>> buffer, its edge is only ~40m from the line (see line-buffer and
>> line-buffer-distance below).
>>
>>  line-buffer.png
>> 
>>
>>  line-buffer-distance.png
>> 
>>
>>
>> Clarifications will be much appreciated. Maybe I just missed some part of
>> the documentation.
>>
>> Thank you.
>>
>> Sincerely,
>> Ben Hur
>>
>> --
>> ---
>>
>> *Ben Hur S. Pintor*
>> bnhr.xyz
>>
>>
>> Consultancy · Training & Support · Development & Innovation
>> ___
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>

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bnhr.xyz


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Re: [Qgis-user] Buffer Algorithm (Buffer distance of output polygon is not equal to the Distance parameter)

[DelazJ]

Hi,
There might be more information in the *Info* drop-down menu. Expand it,
please.

Harrissou

Le jeu. 27 sept. 2018 à 16:55, Ben Hur Pintor  a écrit :

> Hi everyone.
>
> I apologize if this has been asked before but I would just like to clarify
> if this is how the buffer algorithm in QGIS should function.
>
> *Issue:* The actual distance from the input layer to the buffer polygon
> created by the Buffer processing tool (and v.buffer) is not equal (only
> around 80%) to the Distance parameter provided in the said tool.
>
> *Example:* My coordinate reference system is WGS84/UTM Zone 51N (EPSG:
> 32651). I create a 100m buffer around a point but when I measure the
> resulting circle, its edge is only ~80m from the point (see buffer-point
> and buffer-point-distance below).
>
>  buffer-point.png
> 
>
>  buffer-point-distance.png
> 
>
> I create a 50m buffer around a line but when I measure the resulting
> buffer, its edge is only ~40m from the line (see line-buffer and
> line-buffer-distance below).
>
>  line-buffer.png
> 
>
>  line-buffer-distance.png
> 
>
>
> Clarifications will be much appreciated. Maybe I just missed some part of
> the documentation.
>
> Thank you.
>
> Sincerely,
> Ben Hur
>
> --
> ---
>
> *Ben Hur S. Pintor*
> bnhr.xyz
>
>
> Consultancy · Training & Support · Development & Innovation
> ___
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[Qgis-user] Buffer Algorithm (Buffer distance of output polygon is not equal to the Distance parameter)

[Ben Hur Pintor]

Hi everyone.

I apologize if this has been asked before but I would just like to clarify
if this is how the buffer algorithm in QGIS should function.

*Issue:* The actual distance from the input layer to the buffer polygon
created by the Buffer processing tool (and v.buffer) is not equal (only
around 80%) to the Distance parameter provided in the said tool.

*Example:* My coordinate reference system is WGS84/UTM Zone 51N (EPSG:
32651). I create a 100m buffer around a point but when I measure the
resulting circle, its edge is only ~80m from the point (see buffer-point
and buffer-point-distance below).

 buffer-point.png


 buffer-point-distance.png


I create a 50m buffer around a line but when I measure the resulting
buffer, its edge is only ~40m from the line (see line-buffer and
line-buffer-distance below).

 line-buffer.png


 line-buffer-distance.png



Clarifications will be much appreciated. Maybe I just missed some part of
the documentation.

Thank you.

Sincerely,
Ben Hur

-- 
---

*Ben Hur S. Pintor*
bnhr.xyz


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Re: [Qgis-user] Circular Lines in QGIS

[C Hamilton]

The arrow line renderer is close to what I want but only does a simplistic
curve. In the example, notice how lines emerge at different bearings
depending on the number of lines coming to or from each node. Also the
curves are circular in nature but not a circular arc. They are more of a
spline.

I thought it was worth asking to see if anyone had any idea on how to do
this. Maps like this look nice, but I don't know how to implement it in
QGIS.

Calvin

On Wed, Sep 26, 2018 at 6:36 PM, Alexandre Neto 
wrote:

> Check the arrow line renderer on QGIS 3. I think it does what you are
> looking for.
>
>
> A qua, 26/09/2018, 23:04, Adam Dershowitz  escreveu:
>
>> No, they aren’t great circle.  For example, look at the route from Boston
>> to Denver, and then from New York to Denver.  One goes far south (over
>> Atlanta), and the other goes way north (over Canada), but both great circle
>> routes should be fairly close to each other.  They start at cities that are
>> perhaps 200 miles apart, and the middle of the routes are 700 miles apart,
>> to get to the same location.
>>
>>
>> --Adam
>>
>>
>>
>> On Sep 26, 2018, at 5:54 PM, Wolstan H M Dixie <
>> wolstan-di...@hotmail.co.uk> wrote:
>>
>> I don't know but am guessing, but aren't those lines not just *any*
>> circular arcs, but the actual great-circle paths (the shortest line between
>> two points on the surface of a globe) plotted onto that map projection?
>> Some of them towards the edges aren't circular.
>>
>> On 26/09/2018 21:34, C Hamilton wrote:
>>
>> I had a user request Circular Lines in the Shape Tools plugin and they
>> gave the following example.
>>
>> https://www.stayaspensnowmass.com/sites/default/files/aspenFlightMap.jpg
>>
>> I don't know how one would do this type of drawing. Does anyone have any
>> ideas? It draws the lines trying to avoid overlapping other lines in a very
>> pleasing manner. Doing this is probably outside the scope of the Shape
>> Tools plugin, but I just wanted to ask to see if there is a relatively easy
>> algorithmic way of drawing these types of lines between two points.
>>
>> Thanks,
>>
>> Calvin
>>
>>
>>
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Re: [Qgis-user] Hot Spot Accumulation

[Andreas Neumann]

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  
> SENT: 27 September 2018 13:17
> TO: GILLEN Finbar 
> CC: Nicolas Cadieux ; qgis-user@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  
> SENT: 27 September 2018 12:51
> TO: GILLEN Finbar 
> CC: qgis-user@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  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)? 
> 
>  
> 
> I would be looking to weight the score with a variable within the dataset to. 
> 
> Regards 
> 
> Finbar 
> 
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Re: [Qgis-user] Hot Spot Accumulation

[Andrew Harfoot]

For circles of a specific size, one per input data point you'll need to 
build your own using tools from the Processing toolbox:


1. Use the Buffer tool on the input points to 200m to create the circles
2. Use the Join attributes by location tool to attribute the circles 
with counts and / or weighted counts of the input points falling within 
each.


Cheers,

Andy


On 27/09/2018 12:53, 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 
*Sent:* 27 September 2018 12:51
*To:* GILLEN Finbar 
*Cc:* qgis-user@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

Nicolas


Le 27 sept. 2018 à 07:42, GILLEN Finbar > 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)?



I would be looking to weight the score with a variable within the
dataset to.

Regards

Finbar

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Unless stated to the contrary, any opinions expressed in this message 
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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, 
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University of Southampton
Southampton
SO17 1BJ

Tel:  +44 (0)23 8059 2719

www.geodata.soton.ac.uk

__

Re: [Qgis-user] Hot Spot Accumulation

[Andreas Neumann]

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


or 

https://anitagraser.com/2017/06/13/even-more-aggregations-qgis-point-cluster-renderer/


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  
> SENT: 27 September 2018 12:51
> TO: GILLEN Finbar 
> CC: qgis-user@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 
> 
> Nicolas 
> 
> Le 27 sept. 2018 à 07:42, GILLEN Finbar  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)? 
>> 
>>  
>> 
>> I would be looking to weight the score with a variable within the dataset 
>> to. 
>> 
>> Regards 
>> 
>> Finbar 
>> 
>> *
>> 
>> The contents and any attachments of this electronic mail message are 
>> 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.
>> 
>> "AXA Supporting Road Safety in Ireland"
>> 
>> Internet e-mails are not necessarily secure. AXA Group does not accept 
>> responsibility for changes made to this message after it was sent. To help 
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Re: [Qgis-user] Hot Spot Accumulation

[GILLEN Finbar]

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 
Sent: 27 September 2018 12:51
To: GILLEN Finbar 
Cc: qgis-user@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
Nicolas

Le 27 sept. 2018 à 07:42, GILLEN Finbar 
mailto:finbar.gil...@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)?



I would be looking to weight the score with a variable within the dataset to.

Regards
Finbar




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AXA Group of Companies.

AXA Insurance dac is regulated by the Central Bank of Ireland. For business in 
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Ireland and subject to limited regulation by the Financial Conduct Authority. 
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Re: [Qgis-user] Hot Spot Accumulation

[Nicolas Cadieux]

Hi,
I believe heat map will do that. You can use weight from field.
http://www.qgistutorials.com/fr/docs/creating_heatmaps.html
Nicolas

> Le 27 sept. 2018 à 07:42, GILLEN Finbar  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)?
>  
> 
>  
> I would be looking to weight the score with a variable within the dataset to.
>  
> Regards
> Finbar
>  
>  
>  
>  
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[Qgis-user] Hot Spot Accumulation

[GILLEN Finbar]

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)?

[cid:image001.png@01D4565F.84E72650]

I would be looking to weight the score with a variable within the dataset to.

Regards
Finbar




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The contents and any attachments of this electronic mail message are 
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.

"AXA Supporting Road Safety in Ireland"

Internet e-mails are not necessarily secure. AXA Group does not accept 
responsibility for changes made to this message after it was sent. To help 
promote the use of electronic documents and to be kinder to the environment, 
please consider whether you really need to print this
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[Qgis-user] GNSS Receiver/Rover with Sapos working directly in qgis or use qgis symbols

[Bernd Laskowski]

Hi all,
do anyone know about a professional solution with qgis, like trimble 
yuma, rover and arcpad which supports sapos?


Regards
Bernd
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