Re: [Qgis-user] Proportional Symbols Bug in 3.2?

[Nicolas Cadieux]

Hi,

Not sure, try creating a new field with another format and use the field 
calculator to copy the data (this could change the data so please don't 
destroy your old fields). I would try with a Int32 or UInt32.


Nicolas

On 2019-03-12 1:39 p.m., Aj Hollenbach wrote:

Hi Nicolas,

I looked at the dataset and the "total served" by the water utility is 
indeed in an Integer format. Any other ideas on what might be 
preventing the use of proportional symbols? Perhaps this is bug with 
this version of QGIS?


Thanks Much,
Allen

image.png

On Mon, Feb 11, 2019 at 12:58 PM Nicolas Cadieux 
mailto:nicolas.cadi...@archeotec.ca>> 
wrote:


Perhaps your size field is stored in a text format and not a float
or int format...
Look at your” Layer properties, information, Fields.”

Le 11 févr. 2019 à 12:39, Aj Hollenbach mailto:ajhollenb...@gmail.com>> a écrit :


Hi QGIS User Community!

I am attempting to represent water utilities (points) using
*graduated symbols* (by size), and would like the symbols to be
*proportional* to the number of customers. I thought that this
could be done be done under the symbology dialogue box by
selecting "graduated" and then "size" for the method while also
using the "*data-defined size legend*" option under the
"advanced" sub-menu. However, whenever I click on the "advanced"
button and then select "data-defined size legend", I receive an
error message that "*data-defined size is not enabled*". Is this
a bug in version 3.2, or am I doing something incorrectly?
Alternatively, is there another approach creating proportional
symbols by size for point data?

Thanks Much,
Allen
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Re: [Qgis-user] Proportional Symbols Bug in 3.2?

[Aj Hollenbach]

Hi Nicolas,

I looked at the dataset and the "total served" by the water utility is
indeed in an Integer format. Any other ideas on what might be preventing
the use of proportional symbols? Perhaps this is bug with this version of
QGIS?

Thanks Much,
Allen

[image: image.png]

On Mon, Feb 11, 2019 at 12:58 PM Nicolas Cadieux <
nicolas.cadi...@archeotec.ca> wrote:

> Perhaps your size field is stored in a text format and not a float or int
> format...
> Look at your” Layer properties, information, Fields.”
>
> Le 11 févr. 2019 à 12:39, Aj Hollenbach  a écrit :
>
> Hi QGIS User Community!
>
> I am attempting to represent water utilities (points) using *graduated
> symbols* (by size), and would like the symbols to be *proportional* to
> the number of customers. I thought that this could be done be done under
> the symbology dialogue box by selecting "graduated" and then "size" for the
> method while also using the "*data-defined size legend*" option under the
> "advanced" sub-menu. However, whenever I click on the "advanced" button and
> then select "data-defined size legend", I receive an error message that 
> "*data-defined
> size is not enabled*". Is this a bug in version 3.2, or am I doing
> something incorrectly? Alternatively, is there another approach creating
> proportional symbols by size for point data?
>
> Thanks Much,
> Allen
>
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Re: [Qgis-user] Proportional Symbols Bug in 3.2?

[Nicolas Cadieux]

Perhaps your size field is stored in a text format and not a float or int 
format...
Look at your” Layer properties, information, Fields.”

> Le 11 févr. 2019 à 12:39, Aj Hollenbach  a écrit :
> 
> Hi QGIS User Community!
> 
> I am attempting to represent water utilities (points) using graduated symbols 
> (by size), and would like the symbols to be proportional to the number of 
> customers. I thought that this could be done be done under the symbology 
> dialogue box by selecting "graduated" and then "size" for the method while 
> also using the "data-defined size legend" option under the "advanced" 
> sub-menu. However, whenever I click on the "advanced" button and then select 
> "data-defined size legend", I receive an error message that "data-defined 
> size is not enabled". Is this a bug in version 3.2, or am I doing something 
> incorrectly? Alternatively, is there another approach creating proportional 
> symbols by size for point data?
> 
> Thanks Much,
> Allen
> ___
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[Qgis-user] Proportional Symbols Bug in 3.2?

[Aj Hollenbach]

 Hi QGIS User Community!

I am attempting to represent water utilities (points) using *graduated
symbols* (by size), and would like the symbols to be *proportional* to the
number of customers. I thought that this could be done be done under the
symbology dialogue box by selecting "graduated" and then "size" for the
method while also using the "*data-defined size legend*" option under the
"advanced" sub-menu. However, whenever I click on the "advanced" button and
then select "data-defined size legend", I receive an error message
that "*data-defined
size is not enabled*". Is this a bug in version 3.2, or am I doing
something incorrectly? Alternatively, is there another approach creating
proportional symbols by size for point data?

Thanks Much,
Allen
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Re: [Qgis-user] proportional symbols

[Goyo]

I think all in your slides can be done with Qgis right now. But Giovanni
is asking for more, not just proportional size. For one look at the
population example he provides[1] and see how double size doesn't mean
double population.

I want to make clear that I'm not arguing anymore, just pointing out
that this is not really proportional.

Goyo

[1]
http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html

El mié, 29-10-2008 a las 13:25 +0100, Barend Kobben escribió:
> Proportional point symbols indeed ARE one of the most important cartographic
> map types. If this gets implemented well in QGIS I am all for it. But please
> take care to do it right then! One important thing to note:
> For most symbols (2d symbols like squares and circles, ect) it's NOT 'double
> population should mean double SIZE', its actually 'double population should
> mean double AREA of the symbol'. Ie.  1x1 mm square = 10 people , 10x10 mm
> square = 1000 people.
> 
> I've attached some slides from a lecture I regularly give about that. If
> needed, I can provide further advise or additional references...
> [attachement was refused, I've put it on:
> http://kartoweb.itc.nl/fileshare/propPointSymbols.pdf
> ] 
> 
> yours
> 

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Re: [Qgis-user] proportional symbols

[G. Allegri]

Thanks Dr. Kobben for the support :-)
As I told in the trac ticket, that I opened about this, the area
should/could be calculated on the base of a classification as done for
the graduated colors. The criteria can be equal intervals, quantiles,
natural breaks, standard deviation, etc.


2008/10/29 Barend Kobben <[EMAIL PROTECTED]>:
> Proportional point symbols indeed ARE one of the most important cartographic
> map types. If this gets implemented well in QGIS I am all for it. But please
> take care to do it right then! One important thing to note:
> For most symbols (2d symbols like squares and circles, ect) it's NOT 'double
> population should mean double SIZE', its actually 'double population should
> mean double AREA of the symbol'. Ie.  1x1 mm square = 10 people , 10x10 mm
> square = 1000 people.
>
> I've attached some slides from a lecture I regularly give about that. If
> needed, I can provide further advise or additional references...
> [attachement was refused, I've put it on:
> http://kartoweb.itc.nl/fileshare/propPointSymbols.pdf
> ]
>
> yours
>
> --
> Barend Köbben
> International Institute for Geo-Information
> Sciences and Earth Observation (ITC)
> PO Box 6, 7500AA Enschede, The Netherlands
> +31 (0)53 4874253
>
>
>>
>> It seems to be a more common feature than I thought. Still I don't
>> understand the use if this (I think double size should mean double
>> population) but I guess I can live with the clutter.
>>
>> Goyo
>
> International Institute for Geo-Information Science and Earth Observation 
> (ITC)
> Chamber of Commerce: 410 27 560
>
> E-mail disclaimer
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> this e-mail by mistake, please delete the message and any attachment and 
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Re: [Qgis-user] proportional symbols

[Barend Kobben]

Proportional point symbols indeed ARE one of the most important cartographic
map types. If this gets implemented well in QGIS I am all for it. But please
take care to do it right then! One important thing to note:
For most symbols (2d symbols like squares and circles, ect) it's NOT 'double
population should mean double SIZE', its actually 'double population should
mean double AREA of the symbol'. Ie.  1x1 mm square = 10 people , 10x10 mm
square = 1000 people.

I've attached some slides from a lecture I regularly give about that. If
needed, I can provide further advise or additional references...
[attachement was refused, I've put it on:
http://kartoweb.itc.nl/fileshare/propPointSymbols.pdf
] 

yours

-- 
Barend Köbben
International Institute for Geo-Information
Sciences and Earth Observation (ITC)
PO Box 6, 7500AA Enschede, The Netherlands
+31 (0)53 4874253


> 
> It seems to be a more common feature than I thought. Still I don't
> understand the use if this (I think double size should mean double
> population) but I guess I can live with the clutter.
> 
> Goyo

International Institute for Geo-Information Science and Earth Observation (ITC)
Chamber of Commerce: 410 27 560

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that any disclosure, copying, distribution or action in relation to the content 
of this information is strictly prohibited. If you have received this e-mail by 
mistake, please delete the message and any attachment and inform the sender by 
return e-mail. ITC accepts no liability for any error or omission in the 
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Re: [Qgis-user] proportional symbols

[G. Allegri]

Yes, it's very common, and in my field it's very useful too. For
example it is used to visualize wells water chemical monitoring...

2008/10/28 Goyo <[EMAIL PROTECTED]>:
> It seems to be a more common feature than I thought. Still I don't
> understand the use if this (I think double size should mean double
> population) but I guess I can live with the clutter.
>
> Goyo
>
> El lun, 27-10-2008 a las 23:21 +0100, G. Allegri escribió:
>> It's very strange to me that it seams so strange to have proportional
>> point size symbology on the base of attributes values.
>> It's a basic feature of cartography...
>>
>> Some example references I can give:
>> http://mapserver.gis.umn.edu/docs/howto/cartosymbols/#scaling-of-symbols
>> http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html
>> http://www96.reliefweb.int/tools/details/geospatial-analysis/symbols-and-markers
>>
>> 2008/10/27 Goyo <[EMAIL PROTECTED]>:
>> > OK I read the ticket and I think I've got the point now. First of all
>> > you'll want to know that the lower size limit is gone in 1.0 but I don't
>> > think you're going to get good looking results with your data anyway.
>> >
>> > So you want to tell the sizes for maximum and minimum field values
>> > (whatever they are) and get the size for any value computed by linear
>> > interpolation.
>> >
>> > To be honest I don't see this useful enough (in general) as to justify
>> > the additional clutter in UI. On the other hand that's the way colormaps
>> > are handled in rasters, more or less.
>> >
>> > Just some thoughts.
>> >
>> > Goyo
>> >
>> > El lun, 27-10-2008 a las 21:49 +0100, Goyo escribió:
>> >> Hi Giovanny,
>> >>
>> >> it scales the symbol size, not the attribute values. Since your
>> >> attribute values are big you're getting big symbols.
>> >>
>> >> Goyo
>> >>
>> >> El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió:
>> >> > I migrate here a discussion started in a ticket
>> >> > https://trac.osgeo.org/qgis/ticket/960
>> >> >
>> >> > I change the question asking the following: how to make proportional
>> >> > symbols, i.e. with the size based on a certain attribute?
>> >> > I thought I should use the "Area scale fields" in the Properties
>> >> > window. It does the work, but it doesn't scale the sttribute values,
>> >> > so if the they are "big" the symbols overlay each other even covering
>> >> > the entire screen.
>> >> >
>> >> > I show two images about this:
>> >> > Property dialog: http://www.geospatial.it/allegri/property.png
>> >> > Result: http://www.geospatial.it/allegri/graduated.png
>> >> >
>> >> > I've used the lower allowed "Dimension" (=3)...
>> >> >
>> >> > Am I using a tool that wasn't supposed to do this work? Or am I using
>> >> > it in the wrong way?
>> >> >
>> >> > Giovanni
>> >> > ___
>> >> > Qgis-user mailing list
>> >> > Qgis-user@lists.osgeo.org
>> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
>> >
>> >
>
>
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Re: [Qgis-user] proportional symbols

[Goyo]

It seems to be a more common feature than I thought. Still I don't
understand the use if this (I think double size should mean double
population) but I guess I can live with the clutter.

Goyo

El lun, 27-10-2008 a las 23:21 +0100, G. Allegri escribió:
> It's very strange to me that it seams so strange to have proportional
> point size symbology on the base of attributes values.
> It's a basic feature of cartography...
> 
> Some example references I can give:
> http://mapserver.gis.umn.edu/docs/howto/cartosymbols/#scaling-of-symbols
> http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html
> http://www96.reliefweb.int/tools/details/geospatial-analysis/symbols-and-markers
> 
> 2008/10/27 Goyo <[EMAIL PROTECTED]>:
> > OK I read the ticket and I think I've got the point now. First of all
> > you'll want to know that the lower size limit is gone in 1.0 but I don't
> > think you're going to get good looking results with your data anyway.
> >
> > So you want to tell the sizes for maximum and minimum field values
> > (whatever they are) and get the size for any value computed by linear
> > interpolation.
> >
> > To be honest I don't see this useful enough (in general) as to justify
> > the additional clutter in UI. On the other hand that's the way colormaps
> > are handled in rasters, more or less.
> >
> > Just some thoughts.
> >
> > Goyo
> >
> > El lun, 27-10-2008 a las 21:49 +0100, Goyo escribió:
> >> Hi Giovanny,
> >>
> >> it scales the symbol size, not the attribute values. Since your
> >> attribute values are big you're getting big symbols.
> >>
> >> Goyo
> >>
> >> El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió:
> >> > I migrate here a discussion started in a ticket
> >> > https://trac.osgeo.org/qgis/ticket/960
> >> >
> >> > I change the question asking the following: how to make proportional
> >> > symbols, i.e. with the size based on a certain attribute?
> >> > I thought I should use the "Area scale fields" in the Properties
> >> > window. It does the work, but it doesn't scale the sttribute values,
> >> > so if the they are "big" the symbols overlay each other even covering
> >> > the entire screen.
> >> >
> >> > I show two images about this:
> >> > Property dialog: http://www.geospatial.it/allegri/property.png
> >> > Result: http://www.geospatial.it/allegri/graduated.png
> >> >
> >> > I've used the lower allowed "Dimension" (=3)...
> >> >
> >> > Am I using a tool that wasn't supposed to do this work? Or am I using
> >> > it in the wrong way?
> >> >
> >> > Giovanni
> >> > ___
> >> > Qgis-user mailing list
> >> > Qgis-user@lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >
> >

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Re: [Qgis-user] proportional symbols

[G. Allegri]

It's very strange to me that it seams so strange to have proportional
point size symbology on the base of attributes values.
It's a basic feature of cartography...

Some example references I can give:
http://mapserver.gis.umn.edu/docs/howto/cartosymbols/#scaling-of-symbols
http://demo.mapfish.org/mapfishsample/1.0/examples/geostat/proportionalSymbols.html
http://www96.reliefweb.int/tools/details/geospatial-analysis/symbols-and-markers

2008/10/27 Goyo <[EMAIL PROTECTED]>:
> OK I read the ticket and I think I've got the point now. First of all
> you'll want to know that the lower size limit is gone in 1.0 but I don't
> think you're going to get good looking results with your data anyway.
>
> So you want to tell the sizes for maximum and minimum field values
> (whatever they are) and get the size for any value computed by linear
> interpolation.
>
> To be honest I don't see this useful enough (in general) as to justify
> the additional clutter in UI. On the other hand that's the way colormaps
> are handled in rasters, more or less.
>
> Just some thoughts.
>
> Goyo
>
> El lun, 27-10-2008 a las 21:49 +0100, Goyo escribió:
>> Hi Giovanny,
>>
>> it scales the symbol size, not the attribute values. Since your
>> attribute values are big you're getting big symbols.
>>
>> Goyo
>>
>> El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió:
>> > I migrate here a discussion started in a ticket
>> > https://trac.osgeo.org/qgis/ticket/960
>> >
>> > I change the question asking the following: how to make proportional
>> > symbols, i.e. with the size based on a certain attribute?
>> > I thought I should use the "Area scale fields" in the Properties
>> > window. It does the work, but it doesn't scale the sttribute values,
>> > so if the they are "big" the symbols overlay each other even covering
>> > the entire screen.
>> >
>> > I show two images about this:
>> > Property dialog: http://www.geospatial.it/allegri/property.png
>> > Result: http://www.geospatial.it/allegri/graduated.png
>> >
>> > I've used the lower allowed "Dimension" (=3)...
>> >
>> > Am I using a tool that wasn't supposed to do this work? Or am I using
>> > it in the wrong way?
>> >
>> > Giovanni
>> > ___
>> > Qgis-user mailing list
>> > Qgis-user@lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
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Re: [Qgis-user] proportional symbols

[Goyo]

OK I read the ticket and I think I've got the point now. First of all
you'll want to know that the lower size limit is gone in 1.0 but I don't
think you're going to get good looking results with your data anyway.

So you want to tell the sizes for maximum and minimum field values
(whatever they are) and get the size for any value computed by linear
interpolation.

To be honest I don't see this useful enough (in general) as to justify
the additional clutter in UI. On the other hand that's the way colormaps
are handled in rasters, more or less.

Just some thoughts.

Goyo

El lun, 27-10-2008 a las 21:49 +0100, Goyo escribió:
> Hi Giovanny,
> 
> it scales the symbol size, not the attribute values. Since your
> attribute values are big you're getting big symbols.
> 
> Goyo
> 
> El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió:
> > I migrate here a discussion started in a ticket
> > https://trac.osgeo.org/qgis/ticket/960
> > 
> > I change the question asking the following: how to make proportional
> > symbols, i.e. with the size based on a certain attribute?
> > I thought I should use the "Area scale fields" in the Properties
> > window. It does the work, but it doesn't scale the sttribute values,
> > so if the they are "big" the symbols overlay each other even covering
> > the entire screen.
> > 
> > I show two images about this:
> > Property dialog: http://www.geospatial.it/allegri/property.png
> > Result: http://www.geospatial.it/allegri/graduated.png
> > 
> > I've used the lower allowed "Dimension" (=3)...
> > 
> > Am I using a tool that wasn't supposed to do this work? Or am I using
> > it in the wrong way?
> > 
> > Giovanni
> > ___
> > Qgis-user mailing list
> > Qgis-user@lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user

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Re: [Qgis-user] proportional symbols

[Goyo]

Hi Giovanny,

it scales the symbol size, not the attribute values. Since your
attribute values are big you're getting big symbols.

Goyo

El dom, 19-10-2008 a las 21:15 +0200, G. Allegri escribió:
> I migrate here a discussion started in a ticket
> https://trac.osgeo.org/qgis/ticket/960
> 
> I change the question asking the following: how to make proportional
> symbols, i.e. with the size based on a certain attribute?
> I thought I should use the "Area scale fields" in the Properties
> window. It does the work, but it doesn't scale the sttribute values,
> so if the they are "big" the symbols overlay each other even covering
> the entire screen.
> 
> I show two images about this:
> Property dialog: http://www.geospatial.it/allegri/property.png
> Result: http://www.geospatial.it/allegri/graduated.png
> 
> I've used the lower allowed "Dimension" (=3)...
> 
> Am I using a tool that wasn't supposed to do this work? Or am I using
> it in the wrong way?
> 
> Giovanni
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
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[Qgis-user] proportional symbols

[G. Allegri]

I migrate here a discussion started in a ticket
https://trac.osgeo.org/qgis/ticket/960

I change the question asking the following: how to make proportional
symbols, i.e. with the size based on a certain attribute?
I thought I should use the "Area scale fields" in the Properties
window. It does the work, but it doesn't scale the sttribute values,
so if the they are "big" the symbols overlay each other even covering
the entire screen.

I show two images about this:
Property dialog: http://www.geospatial.it/allegri/property.png
Result: http://www.geospatial.it/allegri/graduated.png

I've used the lower allowed "Dimension" (=3)...

Am I using a tool that wasn't supposed to do this work? Or am I using
it in the wrong way?

Giovanni
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