Re: [Qgis-user] Symbology blank

[Thayer Young]

 Hi Ruby,
Building on the answers of the others:
1)  You may not have any geometry in your layers, so there is nothing to 
display in the symbology because there is no geometry type.     a) For example 
if you only have an attribute table, for example the '.dbf' of a shape file, or 
a text file like a '.csv' file, or the text file has been imported without 
geometry, in which case you need to open it again.     b) You may have done the 
join in reverse. You may have joined the geometry layer to the attribute/text 
layer. That would result in there being no geometry.          i) Open the other 
properties dialog of the other layer and see if there is something in the 
symbology tab.             a) If so remove the join from the first layer, and 
do the join from the other layer instead.             b) adjust the symbology 
in whichever order you see fee it will not make a difference.            c) if 
not you may not have any geometry, so there is no spatial information to 
display symbology for.
2) If you look at the top of Properties dialog do you see a drop down menu that 
says "No Symbols" and a line of text in the middle of the dialog that says "No 
symbols will be rendered for features in this layer." In that case you just 
need to switch the dropdown menu to your desired display type that is 
appropriate for the data type of the fields (see Richard's answer).
3) Kirk's answer is not applicable :-), since a layer with geometry but no 
features should still have adjustable symbology. 
-Thayer

On Wednesday, February 17, 2021, 03:00:49 PM EST, 
qgis-user-requ...@lists.osgeo.org  wrote:  
 
 
Date: Wed, 17 Feb 2021 11:44:36 +
From: Ruby Jardine 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Symbology blank
Message-ID: 
Content-Type: text/plain;    charset=utf-8

Hi, I am trying to create a standard global map on the prevalence of maternal 
health issues. I have added my datasets and joined them, however when I go to 
the ?Symbology? section to colour code the map, it is blank. Do you know why 
this is and how I can change this to be able to create my map. 

Thank you 

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Re: [Qgis-user] Symbology blank

[Richard Duivenvoorde]

On 2/17/21 12:44 PM, Ruby Jardine wrote:
> Hi, I am trying to create a standard global map on the prevalence of maternal 
> health issues. I have added my datasets and joined them, however when I go to 
> the ‘Symbology’ section to colour code the map, it is blank. Do you know why 
> this is and how I can change this to be able to create my map. 

Is the type of your column you want to use ok (depending on the type of 
symbology you want to use)
?
If you want to use a graduated symbol, you need to have numbers. If you data 
has string as type, you can easily use an expression (the little button next to 
the drop down) to 'cast' your string to int or double. Another option is to fix 
this in the join or your original data.

Regards,

Richard Duivenvoorde
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Re: [Qgis-user] Symbol lines every km, moving when changing scale or moving map

[Prud'homme Jérémie]

Hello,

Does anyone can tell me if the behavior is normal or if it is not working
as expected ?


Jérémie.


Le mar. 12 janv. 2021 à 21:33, Prud'homme Jérémie  a
écrit :

> Hi,
>
> I'm using QGIS 3.10.
>
> I tried to use only symbology to display a stroke every km along a road.
> The project CRS is 2154 (Lambert 93).
>
> When adding a ""symbol line" with an interval of 1000 map units (meter for
> 2154) – or 1000 meters at scale, same result – I achieve to display symbols
> every km.
>
> Problem is when I move the map or change scale, the symbols do not always
> stay in place. They are sometimes misplaced.
>
> I've been told that problem can be that the first node of the line is not
> always the reference to calculate the intervals.
>
> You can find a GIF here that displays my problem :
> https://zupimages.net/viewer.php?id=21/02/nvr2.gif
>
> Circles are symbols via Symbology.
> Strokes are symbos on points generated vith the tool "Points along
> geometry".
>
> You can see that circles are not always at the same place as the strokes.
>
> Is it a "normal" behavior ?
> 
> Anyway as a user I would expect that symbols are always generated at the
> same place from the starting node.
>
> Thanks for your enlightments on this.
>
> Jérémie.
>
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Re: [Qgis-user] Symbology blank

[kirk]

Do your data show up spatially at all on the screen?Sent from my Galaxy
 Original message From: Ruby Jardine  
Date: 2021-02-17  7:44 a.m.  (GMT-04:00) To: qgis-user@lists.osgeo.org Subject: 
[Qgis-user] Symbology blank Hi, I am trying to create a standard global map on 
the prevalence of maternal health issues. I have added my datasets and joined 
them, however when I go to the ‘Symbology’ section to colour code the map, it 
is blank. Do you know why this is and how I can change this to be able to 
create my map. Thank you 
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Re: [Qgis-user] file qpj non creato

[Andrea Giudiceandrea]

antonio valanzano-2 wrote
> ho creato un nuovo con QGIS 3.10.2 e mi sono accorto che non viene più
> creato il file .qpj in aggiunta al classico .prj.
> Qualcuno sa dirmi da quale versione di QGIS accade ciò ?

Ciao Antonio,
questa è la mailing list internazionale degli utenti di QGIS, quindi la
maggior parte degli iscritti comprende la lingua inglese e solo pochi anche
la lingua italiana.

La mailing list degli utenti italiani è all'indirizzo
qgis-it-u...@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user.

Ti consiglio di proseguire la discussione in lingua inglese, su questa
lista.


As said by Bernd and Nyall, the reading and writing of the .qpj ancillary
file for shapefiles by QGIS is avoided if QGIS is build and uses a PROJ
version >= 6 (and thus also GDAL >= 3).

AFAIK, this change was introduced one year ago in QGIS 3.10.3: see
https://github.com/qgis/QGIS/pull/34215
(https://github.com/qgis/QGIS/pull/34242) and
https://github.com/qgis/QGIS/pull/34247
(https://github.com/qgis/QGIS/pull/34253).

Regards.

Andrea Giudiceandrea



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[Qgis-user] Symbology blank

[Ruby Jardine]

Hi, I am trying to create a standard global map on the prevalence of maternal 
health issues. I have added my datasets and joined them, however when I go to 
the ‘Symbology’ section to colour code the map, it is blank. Do you know why 
this is and how I can change this to be able to create my map. 

Thank you 
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