[Qgis-user] Shapefile symbology no longer working when zoom in

[Andrew Chapman]

Hi Andreas

 

In the layer properties->source tab if I delete the .shx file the option Create Spatial Index is grey’d out.  If the .shx file exists the same button is marked Spatial Index Exists and is again grey’d out.

 

 

Andrew

 

From: Andreas Neumann [mailto:andreas at qgis.org] 
Sent: 28 November 2024 17:15
To: Andrew Chapman
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Shapefile symbology no longer working when zoom in

 

Hi Andrew,

 

Maybe it is worth a try to recreate the spatial index? Maybe it has defects or is incompatible. Just remove the .shx files and recreate them with QGIS in the layer properties --> Source tab.

 

Maybe it helps,

Andreas

 

 

 

On Thu, 28 Nov 2024 at 18:05, Andrew Chapman via QGIS-User <qgis-user at lists.osgeo.org> wrote:

Hi

 

My first thought has been  Scale Dependant Visibility but I confirmed that it was off. However, text displays ok when I zoom in but the symbology lines or points vanish – I don’t think one could do this with SDV without two instances of the same layer and different styling.

 

The suggestion of trying an earlier version of QGIS may be worth investigating. I’m returning to QGIS now because we’ve had very bad flooding (again) but I haven’t been involved for the last five years due to health issues. A wrecked computer and finding that all the backups hadn’t been 100% is rather complicating matters.

 

I’ve found old QGIS setup exe files from 2013 and 2014 which I haven’t tried to run yet as I’m not sure if they would load an earlier version in parallel with my later version. 

 

Also, as the problem is associated with shapefiles, are there any suggestions as to how then could be “sanitised”? It seems the problem files are layers that I have created with earlier versions of QGIS while similar aged ones that I’ve downloaded from Ordinance Survey work fine.

 

Andrew

 

From: Karl Magnus Jönsson [mailto:Karl-Magnus.Jonsson at kristianstad.se] 
Sent: 28 November 2024 14:59
To: Richard McDonnell; Andrew Chapman; qgis-user at lists.osgeo.org
Subject: Sv: [Qgis-user] Shapefile symbology no longer working when zoom in

 

Hi!

Which old version are you migrating from? Could be worth trying some intermediate version of QGIS. Open and save and then go to 3.40.

 

Kind regards

 

Karl-Magnus Jönsson

 

Från: QGIS-User <qgis-user-bounces at lists.osgeo.org> För Richard McDonnell via QGIS-User
Skickat: den 28 november 2024 15:07
Till: Andrew Chapman <andrew.chapman at donkagen.co.uk>; qgis-user at lists.osgeo.org
Ämne: Re: [Qgis-user] Shapefile symbology no longer working when zoom in

 

Hi Andrew, 

Sounds like you have set Scale Dependant Visibility, setting a Min or Max Scale in the Symbology or Rendering on the Layer Properties

That would be my first port of call anyway.

Kind Regard’s,

 

Richard

 

 



——
Richard McDonnell MSc GIS, FME Certified Professional
Flood Risk Management - Data Management

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From: QGIS-User <qgis-user-bounces at lists.osgeo.org> On Behalf Of Andrew Chapman via QGIS-User
Sent: 28 November 2024 13:38
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] Shapefile symbology no longer working when zoom in

 

I’ve not used QGIS for a number of years and now returned to version 3.34.0. With projects that worked ok with earlier versions I find that some shapefiles now only partially work when I zoom in. Text labels continue to work but sybology markers (point and line) vanish when I zoom to scales below about 1:10000.

 

I’ve tried Vector->Geometry Tools->Check Validity but the problem still exists.

 

Any suggestions?

 

 

Andrew Chapman

 

 

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Andreas Neumann

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