[Qgis-user] hide vector under raster?

[Tobias Wendorff]

Hi there,

is it possible to hide a vector layer under a raster layer?

The "click through" identify function allows to query data from the
vector, but on each zoom the vector layer gets rendered completely
again. Sure, it makes use of an spatial index, but since there are
many vector elements, it takes a while.

I tried to hide the vector layer using visibility at fixed scale,
but then it's not possible to query it...

Best regards,
Tobias

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Re: [Qgis-user] hide vector under raster?

[Tobias Wendorff]

Hi there,

Am Di, 29.05.2018, 14:17 schrieb Karl Magnus Jönsson:
>
> How about using the no symbols renderer in the style tab in Layer
> properties? Wouldn't that do?

I just had the same idea, but no... when zooming out, QGIS crashes
after some minutes (even on a big machine).

I really miss "join table to raster" function from ArcGIS, but I
don't have enough money to donate the function to QGIS :(

Best regards,
Tobias

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Re: [Qgis-user] hide vector under raster?

[Karl Magnus Jönsson]

Hi!
How about using the no symbols renderer in the style tab in Layer properties? 
Wouldn't that do?

Regards

Karl-Magnus Jönsson

-Ursprungligt meddelande-
Från: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] För Tobias Wendorff
Skickat: den 29 maj 2018 13:08
Till: qgis-user@lists.osgeo.org
Ämne: [Qgis-user] hide vector under raster?

Hi there,

is it possible to hide a vector layer under a raster layer?

The "click through" identify function allows to query data from the
vector, but on each zoom the vector layer gets rendered completely
again. Sure, it makes use of an spatial index, but since there are
many vector elements, it takes a while.

I tried to hide the vector layer using visibility at fixed scale,
but then it's not possible to query it...

Best regards,
Tobias

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Re: [Qgis-user] hide vector under raster?

[Bernhard Ströbl]

Hi Tobias,
I did not really get what you want to achieve. Let me put it in my words 
(this is what I understand)

1) You have a vector layer with _many_ features
2) You do not want to have it rendered because it takes so long to render
3) You want to query this layer
4) When you zoom out QGIS crashes when using the no symbols renderer

Questions: What kind of layer is this: DataProvider? geometryType?
Which version of QGIS are you using?
Does QGIS crash when zooming out while you use a simple renderer?

Bernhard

Am 29.05.2018 um 14:25 schrieb Tobias Wendorff:

Hi there,

Am Di, 29.05.2018, 14:17 schrieb Karl Magnus Jönsson:


How about using the no symbols renderer in the style tab in Layer
properties? Wouldn't that do?


I just had the same idea, but no... when zooming out, QGIS crashes
after some minutes (even on a big machine).

I really miss "join table to raster" function from ArcGIS, but I
don't have enough money to donate the function to QGIS :(

Best regards,
Tobias

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Re: [Qgis-user] hide vector under raster?

[Tobias Wendorff]

Hi Bernhard,

Am Di, 29.05.2018, 14:42 schrieb Bernhard Ströbl:
> 1) You have a vector layer with _many_ features

Exactly.

> 2) You do not want to have it rendered because it takes so long to render

Exactly.

> 3) You want to query this layer

Exactly.

> 4) When you zoom out QGIS crashes when using the no symbols renderer

Actually, it doesn't crash because of no symbols renderer. It just
takes so long to load the vector data that QGIS doesn't respond
anymore. When I click somewhere into QGIS after 10-15 minutes, Windows
told me that the app crashed and that I have to restart it.

> Questions: What kind of layer is this: DataProvider? geometryType?

24 shapefiles, polygon grid with 100 x 100 meters

> Which version of QGIS are you using?

QGIS3 (tested stable release and nightly)

> Does QGIS crash when zooming out while you use a simple renderer?

Same behavior: it doesn't respond after some minutes.
There's no difference between no symbols and simple renderer.

Best,
Tobias

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Re: [Qgis-user] hide vector under raster?

[Nicolas Cadieux]

Hi,

If you are having crashes, try on 2.18 to see if you have the same problem.  
Are you using on the fly reprojection?  If your vector file is not in the same 
format as the raster, the reprojection is probably taking all the time.  Try 
saving in an other format like spatialite that is more efficient than shp.  
Copy the file on a local disk and not a file server.  Make a new project with 
only the raster and the vector files to make try and isolate the crash problem. 
 Disable all plugins.

Perhaps the control rendering order in the layer order panel can help?  Not 
sure, I don’t use that.

Nicolas

> Le 29 mai 2018 à 09:00, Tobias Wendorff  a 
> écrit :
> 
> Hi Bernhard,
> 
> Am Di, 29.05.2018, 14:42 schrieb Bernhard Ströbl:
>> 1) You have a vector layer with _many_ features
> 
> Exactly.
> 
>> 2) You do not want to have it rendered because it takes so long to render
> 
> Exactly.
> 
>> 3) You want to query this layer
> 
> Exactly.
> 
>> 4) When you zoom out QGIS crashes when using the no symbols renderer
> 
> Actually, it doesn't crash because of no symbols renderer. It just
> takes so long to load the vector data that QGIS doesn't respond
> anymore. When I click somewhere into QGIS after 10-15 minutes, Windows
> told me that the app crashed and that I have to restart it.
> 
>> Questions: What kind of layer is this: DataProvider? geometryType?
> 
> 24 shapefiles, polygon grid with 100 x 100 meters
> 
>> Which version of QGIS are you using?
> 
> QGIS3 (tested stable release and nightly)
> 
>> Does QGIS crash when zooming out while you use a simple renderer?
> 
> Same behavior: it doesn't respond after some minutes.
> There's no difference between no symbols and simple renderer.
> 
> Best,
> Tobias
> 
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Re: [Qgis-user] Preserving geometry when batching joins

[Nicolas Cadieux]

Hi,

It appears that the join attributes table found in the 2.18 processing 
joins tables but not like the "Joins" found in the layer property.  You 
are right, there is no option to save as a shp file! Only database 
formats.


Your best option is to use the field calculator in the point shp file 
and to create a new column with the geometries x and y. Then you can 
join the table and save as a csv.  Then, reimport the csv and use the x 
and y to recreate the points geometry.


OR

The problem is solved by using Qgis 3 where you can save as a .shp.

Nicolas




On 2018-05-28 1:44 PM, Samuel Williams wrote:

Hi Nicolas,

Thanks! Here are two matching files - I would be interested to know if 
it gives you other options.


https://drive.google.com/open?id=1bM6qGYaNmm93sEbwE4x4aoQSAZMtEIvH 


Let me know if you need anything else.

Sam

On May 28 2018, at 4:15 pm, Nicolas Cadieux 
 wrote:




Hi,

Can you send me a sample of the files?  I have more options on my
computer but is may be that I am not testing with a .csv.

Nicolas

On 2018-05-28 6:35 AM, Samuel Williams wrote:


Bonjour Nicolas,

Thanks for taking the time to answer my email.
Unfortunately the only options that I have for saving the
joined files are all table based - see the screenshot that I
have uploaded here:


https://drive.google.com/file/d/1x0ADTag8xk85Ty3Vx6Wyb0FQCXfKDyBQ/view?usp=sharing



If I do the joins one by one, then yes it is easy to save the
point dataset as a shapefile after it has been joined with the
csv file, but I can't find a way of doing this in batch mode.

Any suggestions?

Thanks,

Sam





On May 28 2018, at 2:16 am, Nicolas Cadieux



wrote:


Hi,
Once you have joined the geometry file to the matching
attribute file, you should be able to save that as a shape
file.  If you can’t figure it out, put a sample on the
next email.
Nicolas

Le 27 mai 2018 à 17:10, Samuel Williams
https://link.getmailspring.com/link/1527529341.local-5ca47607-9dc5-v1.2.1-7e744...@getmailspring.com/3?redirect=https%3A%2F%2Flink.getmailspring.com%2Flink%2F1527503634.local-c54bfe18-f86f-v1.2.1-7e7447b6%40getmailspring.com%2F1%3Fredirect%3Dmailto%253Asam.williams%2540sineenvironmental.com%26recipient%3Dbmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYQ%253D%253D&recipient=bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYQ%3D%3D>>
a écrit :

Hello,

I've hit a issue in Qgis that I'm struggling to
resolve, and I'm hoping that someone might be able to
point me in the right direction.

I have 12 point geometry data sets and 12 csv files.
Each csv file contain the attributes for one of the
point data sets - there are exactly the same number of
records in each point / csv pair:

Points1.shp:
-- point 1 UID
-- point 2 UID
..
-- point 980 UID

Attributes1.csv:
-- record 1 (Point 1 UID, blah, blah, whatever)
-- record 2 (Point 2 UID, blah, blah, whatever)
...
-- record 980 (Point 980 UID, blah, blah, whatever)

I've loaded them all into Qgis and was hoping that I
could join them as a batch process, so that I end up
with 12 point geometry shapefiles, with each point
associated with the equivalent record from the
matching csv file I've had some success, in that
the batch interface to join allows me to list the
input layers, fields for the joins and the output file
names very easily, but I can't work out how to
preserve the geometry of the points. The only file
   

Re: [Qgis-user] Preserving geometry when batching joins

[Samuel Williams]

Thanks, I'll check out QGIS 3!

On Tue, 29 May 2018, 16:00 Nicolas Cadieux, 
wrote:

> Hi,
>
> It appears that the join attributes table found in the 2.18 processing
> joins tables but not like the "Joins" found in the layer property.  You are
> right, there is no option to save as a shp file! Only database
> formats.
>
> Your best option is to use the field calculator in the point shp file and
> to create a new column with the geometries x and y.   Then you can join the
> table and save as a csv.  Then, reimport the csv and use the x and y to
> recreate the points geometry.
>
> OR
>
> The problem is solved by using Qgis 3 where you can save as a .shp.
>
> Nicolas
>
>
>
>
> On 2018-05-28 1:44 PM, Samuel Williams wrote:
>
> Hi Nicolas,
>
> Thanks! Here are two matching files - I would be interested to know if it
> gives you other options.
>
> https://drive.google.com/open?id=1bM6qGYaNmm93sEbwE4x4aoQSAZMtEIvH
> 
> Let me know if you need anything else.
>
> Sam
>
> On May 28 2018, at 4:15 pm, Nicolas Cadieux 
>  wrote:
>
>
>
> Hi,
>
> Can you send me a sample of the files?  I have more options on my computer
> but is may be that I am not testing with a .csv.
>
> Nicolas
>
> On 2018-05-28 6:35 AM, Samuel Williams wrote:
>
>
> Bonjour Nicolas,
>
> Thanks for taking the time to answer my email.
> Unfortunately the only options that I have for saving the joined files are
> all table based - see the screenshot that I have uploaded here:
>
>
> https://drive.google.com/file/d/1x0ADTag8xk85Ty3Vx6Wyb0FQCXfKDyBQ/view?usp=sharing
> 
>
> If I do the joins one by one, then yes it is easy to save the point
> dataset as a shapefile after it has been joined with the csv file, but I
> can't find a way of doing this in batch mode.
>
> Any suggestions?
>
> Thanks,
>
> Sam
>
>
>
>
>
> On May 28 2018, at 2:16 am, Nicolas Cadieux 
> 
> wrote:
>
>
> Hi,
> Once you have joined the geometry file to the matching attribute file, you
> should be able to save that as a shape file.  If you can’t figure it out,
> put a sample on the next email.
> Nicolas
>
> Le 27 mai 2018 à 17:10, Samuel Williams <
> sam.willi...@sineenvironmental.com
> >
> a écrit :
>
> Hello,
>
> I've hit a issue in Qgis that I'm struggling to resolve, and I'm hoping
> that someone might be able to point me in the right direction.
>
> I have 12 point geometry data sets and 12 csv files. Each csv file contain
> the attributes for one of the point data sets - there are exactly the same
> number of records in each point / csv pair:
>
> Points1.shp:
> -- point 1 UID
> -- point 2 UID
> ..
> -- point 980 UID
>
> Attributes1.csv:
> -- record 1 (Point 1 UID, blah, blah, whatever)
> -- record 2 (Point 2 UID, blah, blah, whatever)
> ...
> -- record 980 (Point 980 UID, blah, blah, whatever)
>
> I've loaded them all into Qgis and was hoping that I could join them as a
> batch process, so that I end up with 12 point geometry shapefiles, with
> each point associated with the equivalent record from the matching csv
> file I've had some success, in that the batch interface to join allows
> me to list the input layers, fields for the joins and the output file names
> very easily, but I can't work out how to preserve the geometry of the
> points. The only file type listed that I can save are DBF / XLSX / CSV /
> ODS files, which will only preserve the joined tables not the geometry.
>
> Am I approaching this whole problem in the wrong way, or is there
> something very obvious that I've missed?
>
> I'm using:
>
> QGIS version
>
> 2.18.17
>
> QGIS code branch
>
> Release 2.18
>