[Qgis-user] Layers not showing when .QGS file opened via shared drive

[Baker, Matthew]

Hi all,

I'm having an issue where a .QGS file created on a shared drive then opened 
from another computer doesn't display any of the layers, though the information 
seems to be still in the QGS file.

Attached (hopefully) is an example of this problem.

Can anyone see if there is something missing from the file that is preventing 
the layers from displaying?

Thanks!

-m


Matthew Baker
Denver Public Schools
Department of Planning and Analysis
matthew_ba...@dpsk12.org
720-423-3419 / x33419



Melissa_Compare_GeocodeV2.qgs
Description: Melissa_Compare_GeocodeV2.qgs
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Re: [Qgis-user] Layers not showing when .QGS file opened via shared drive

[Árni Geirsson]

I have had a problem where layers did not show up, only layer groups, that
I traced to the presence of a virtual layer. After removing that in a text
editor, the problem was solved.

Arni


Árni Geirsson
*Alta ehf* // +354 582 5000 // +354 897 9549

On 19 April 2017 at 21:51, Baker, Matthew  wrote:

> Hi all,
>
>
>
> (Sending this again without an attachment)
>
>
>
> I’m having an issue where a .QGS file created on a shared drive then
> opened from another computer doesn’t display any of the layers, though the
> information seems to be still in the QGS file.
>
>
>
> In the .QGS file linked below, when opened in notepad, I can see all the
> layer styling and connection information, but why doesn’t it show the
> layers when opened in QGIS?
>
>
>
> https://www.dropbox.com/s/udz8eb80u1i7lgp/Melissa_
> Compare_GeocodeV2%20-%20bug%20report.qgs?dl=0
>
>
>
> The map was created and opened using the same version of QGIS on both
> client machines.
>
>
>
> Can anyone see if there is something missing from the file that is
> preventing the layers from displaying?
>
>
>
> Thanks!
>
>
>
> -m
>
>
>
>
>
>
> *Matthew Baker *Denver Public Schools
> Department of Planning and Analysis
> matthew_ba...@dpsk12.org
> 720-423-3419 / x33419
>
>
>
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[Qgis-user] Layers not showing when .QGS file opened via shared drive

[Baker, Matthew]

Hi all,

(Sending this again without an attachment)

I'm having an issue where a .QGS file created on a shared drive then opened 
from another computer doesn't display any of the layers, though the information 
seems to be still in the QGS file.

In the .QGS file linked below, when opened in notepad, I can see all the layer 
styling and connection information, but why doesn't it show the layers when 
opened in QGIS?

https://www.dropbox.com/s/udz8eb80u1i7lgp/Melissa_Compare_GeocodeV2%20-%20bug%20report.qgs?dl=0

The map was created and opened using the same version of QGIS on both client 
machines.

Can anyone see if there is something missing from the file that is preventing 
the layers from displaying?

Thanks!

-m


Matthew Baker
Denver Public Schools
Department of Planning and Analysis
matthew_ba...@dpsk12.org
720-423-3419 / x33419

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Re: [Qgis-user] Join multiple Linestrings to single Linestring

[Richard McDonnell]

Another option, you could try is using the*Advanced Digitising Toolbar* 
under *View, Toolbars
*Select the lines you want to merge/Join and click *Merge Selected 
Features*.

This should also allow you to edit the DB directly from QGIS.
I have not tried it, so your issue with Multi-Lines instead of single 
linestrings may still apply.
You could still use the above example on the locally saved version of 
the table though and upload and overwrite the changed dataset.

Sorry I cant be of more help.
Reagrds,

Richard.
On 19/04/2017 14:07, fuenfer-koenigstein.benja...@swm.de wrote:


Hi Richard,

thanks for your suggestion! I think Dissolve won’t work for me as it’s 
applied to the whole layer (hope I understood this right). I’m looking 
for a way to easily merge certain linestrings when I, for example, 
want to create one geometry by first creating a spline and then a 
straight line feature. I will try out your workaround with local 
files. But as the db-source is very large (> 500.000 rows) I’m happy 
for any other suggestion to solve it directly in QGIS with db-source.


Regards

Benjamin

*Von:*Richard McDonnell [mailto:richard.mcdonn...@opw.ie]
*Gesendet:* Mittwoch, 19. April 2017 10:10
*An:* David J. Bakeman; Fuenfer-Koenigstein.Benjamin G-PRA; 
qgis-user@lists.osgeo.org

*Betreff:* Re: [Qgis-user] Join multiple Linestrings to single Linestring

Benjamin,
You could try Dissolve, under Geoprocessing Tools, alternatively you 
could try saving the dataset locally as a shapefile, edit using either 
of the methods you outlined below, In relation to saving the edits 
back to the table as linestring, use the DB Manager tool, select the 
table you wish to update, tick the options you want, making sure both 
*Replace destination Table (if exists) *and*Create single-part 
geometries instead of multi-part* This has worked for me in the past, 
admittedly for polygons, but it should also work for linestrings.


Hope this helps,

Richard.

On 18/04/2017 17:24, David J. Bakeman wrote:

On 04/18/2017 02:17 AM,fuenfer-koenigstein.benja...@swm.de
  wrote:

Hi there,

I want to merge multiple linestrings with same start/endpoint to a single linestring (all 
lines within one layer). As I use a PostGIS source with geometry type linestring, it is important 
that the new geometry is still linestring and not multilinestring type. "Merge selected 
features" tool and "JOIN" in QAD-Plugin both create multilinestrings. Has anyone an 
idea how to directly merge into linestring or how to change geometry type after merging? Thanks for 
your suggestions!

I'm not sure I completely understand what you want but you could run

multipart to singleparts from the Vector/Geometry Tools menu on the

multilinestring layer to generate a layer with just linestrings.

Best regards

Benjamin

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--
*_Richard McDonnell_*
*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
*52 Stephens Green, Dublin 2.*
TEL: 01 6476543

Das Bild wurde vom Absender entfernt. 



--
*_Richard McDonnell_*
*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
*52 Stephens Green, Dublin 2.*
TEL: 01 6476543

OPW - Ag féachaint don am atá le teacht - Ag caomhnú ón am atá thart
OPW - Looking to the future - Caring for the past

***
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[Qgis-user] QGIS Loads Black (Blank) Image For PostGIS Out-Db Raster Data

[Osahon Oduware]

Hi All,

I have an out-db raster on PostGIS which I tried to load in QGIS (v
2.14.12-Essen) utilizing the DB Manager to establish a connection. I could
view the raster table, but when I try to "Add to canvas" it displays a
black (blank) image instead of the raster image.

This raster file exist on the filesystem and when it is loaded directly
into QGIS it displays the image (aerial photo). Also, when the same file is
stored in PostGIS as a raster (IN-DB), it can be viewed in QGIS (using the
DB Manager tool). However, when I reference the same file as an OUT-DB
raster in PostGIS (in this case only the metadata of the raster and the
filepath to the raster file is stored), an attempt to view it in QGIS
(using the DB Manager tool) results in a black image being displayed
instead of the aerial photo.

I would be glad if someone could help me to resolve this.
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Re: [Qgis-user] Join multiple Linestrings to single Linestring

[Richard McDonnell]

Benjamin,
You could try Dissolve, under Geoprocessing Tools, alternatively you 
could try saving the dataset locally as a shapefile, edit using either 
of the methods you outlined below, In relation to saving the edits back 
to the table as linestring, use the DB Manager tool, select the table 
you wish to update, tick the options you want, making sure both *Replace 
destination Table (if exists) *and*Create single-part geometries instead 
of multi-part* This has worked for me in the past, admittedly for 
polygons, but it should also work for linestrings.


Hope this helps,

Richard.

On 18/04/2017 17:24, David J. Bakeman wrote:

On 04/18/2017 02:17 AM, fuenfer-koenigstein.benja...@swm.de wrote:

Hi there,

I want to merge multiple linestrings with same start/endpoint to a single linestring (all lines 
within one layer). As I use a PostGIS source with geometry type linestring, it is important that 
the new geometry is still linestring and not multilinestring type. "Merge selected 
features" tool and "JOIN" in QAD-Plugin both create multilinestrings. Has anyone an 
idea how to directly merge into linestring or how to change geometry type after merging? Thanks for 
your suggestions!

I'm not sure I completely understand what you want but you could run
multipart to singleparts from the Vector/Geometry Tools menu on the
multilinestring layer to generate a layer with just linestrings.

Best regards

Benjamin
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--
*_Richard McDonnell_*
*GIS Specialist PgD GIS AssocSCSI*
*OPW FRM Data Management*
*52 Stephens Green, Dublin 2.*
TEL: 01 6476543

OPW - Ag féachaint don am atá le teacht - Ag caomhnú ón am atá thart
OPW - Looking to the future - Caring for the past

***
Email Disclaimer: http://www.opw.ie/en/disclaimer/

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Re: [Qgis-user] New layer from current view

[phi73]

Hi all,

i have solved it for myself by using the „processing toolbox“
and create a layer for the selected objects (by rectangle)

however: many thanks for your alternatives

pat

On 19. Apr. 2017, 09:57 +0200, Nyall Dawson , wrote:
> On 18 April 2017 at 20:50, Phil (The Geek) Wyatt  
> wrote:
> > Hi Pat,
> >
> >
> >
> > · select just the parts of the current layer that you want to save
> > (CTRL and select the parts)
> >
> > · right click on the layer name and save as
> >
> > · tick the box for 'save only selected features'
>
> There's an easier way -
>
> - right click the layer you want to save, click 'save as'
> - tick the 'extent' check box and click 'map view extent'
>
> done!
>
> Nyall
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Re: [Qgis-user] New layer from current view

[Nyall Dawson]

On 18 April 2017 at 20:50, Phil (The Geek) Wyatt  wrote:
> Hi Pat,
>
>
>
> · select just the parts of the current layer that you want to save
> (CTRL and select the parts)
>
> · right click on the layer name and save as
>
> · tick the box for 'save only selected features'

There's an easier way -

- right click the layer you want to save, click 'save as'
- tick the 'extent' check box and click 'map view extent'

done!

Nyall
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Re: [Qgis-user] General question about best approach

[Stéphane Henriod]

Hi Pat

I think the best would be if yo could share your data (or part of it) and
if you could tell us more about what you want to analyse.

Cheers

Stéphane


Le mardi 18 avril 2017,  a écrit :

> Hello
>
> i have a very general question:
> I am becoming more and more familiar with QGIS and thinking about to run
> some own analysis.
> Now i am not sure how to go on the best.
>
> The key issue is that i have data in two different layers (a link with an
> attribute)
> and i want to compare them (if similar or not or any other mathematical
> calculation)
> and show the result in a table or sth like that.
>
> So how to start the best with so that i can improve my knowledge step by
> step
> in this way.
>
> Thanks
> pat
>
>

-- 
Stéphane Henriod
CIM-Expert for GIS and Green Economy Statistics

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