Re: [Qgis-user] Showing all items in attributes table

[Bernd Vogelgesang]

Am 03.08.2016, 13:25 Uhr, schrieb simonc8 :


Thanks for this. The multipart to single part seemed to clean the file as
well as show that one of my polylines existed in three separate  
segments. So

the file now contains 8 features whether I open it in QGIS or other
programmes.

When I was digitising I wanted to use part of one line I'd already  
digitised

in another line, so I made a copy, cut the line and must have incorrectly
discarded the unwanted part, or inadvertently made a second copy.

If I want to combine my line which is currently in three segments into a
single feature how do I do that? Do the different segments have to have
identical end points to join properly? (At the moment there are small  
gaps

between the different segments.)


Maybe now v.clean is the right tool. I love it ;)
Select "snap" there and set the threshold for the estimated width of your  
gaps + x.
If this doesn't work (documentation refers to vertices snapped to lines,  
not vertices to vertices),
try the same, but leave the so threshold low that it will not trigger a  
snap, but go to the advanced settings and rise the threshold for snapping  
there.
This is a different function in GRASS, where you can perform basic  
cleaning and snapping while importing the data set into GRASS.


I think that you will then still have separate features, but spatially  
aligned.
If your line segments have a common value or id, try "Line dissolve" from  
SAGA in the toolbox.


Anyway, hard to give the proper hints without seeing the data. For me it's  
always a trial-and-error-game, too.


Cheers
Bernd






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Bernd Vogelgesang
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Re: [Qgis-user] Showing all items in attributes table

[simonc8]

Thanks for this. The multipart to single part seemed to clean the file as
well as show that one of my polylines existed in three separate segments. So
the file now contains 8 features whether I open it in QGIS or other
programmes.

When I was digitising I wanted to use part of one line I'd already digitised
in another line, so I made a copy, cut the line and must have incorrectly
discarded the unwanted part, or inadvertently made a second copy.

If I want to combine my line which is currently in three segments into a
single feature how do I do that? Do the different segments have to have
identical end points to join properly? (At the moment there are small gaps
between the different segments.)




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Re: [Qgis-user] Showing all items in attributes table

[Bernd Vogelgesang]

Hi,
sounds like something really went wrong while digitizing.
Try the GRASS function v.clean with "rmdupl" from the toolbox to get rid  
of the duplicates.
Or try "Multipart to singleparts" also in the toolbox to create unique  
entries for your lines in the attributes table.


Cheers
Bernd

Am 03.08.2016, 10:41 Uhr, schrieb simonc8 :

I've digitised a shape file layer with several polylines. In the  
Attribute
table it shows 8 items, but in the metadata for the file it states there  
are
14 features. If I open the shape file in another GIS programme it comes  
up

with 17 polylines, some of which are duplicates of others.

I would like to clean up the file in QGIS and remove the duplicates but  
if I

can't get these to show up in the Attribute table I don't know how I can
select them to delete them.

Grateful for advice.



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Bernd Vogelgesang
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91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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[Qgis-user] Showing all items in attributes table

[simonc8]

I've digitised a shape file layer with several polylines. In the Attribute
table it shows 8 items, but in the metadata for the file it states there are
14 features. If I open the shape file in another GIS programme it comes up
with 17 polylines, some of which are duplicates of others.

I would like to clean up the file in QGIS and remove the duplicates but if I
can't get these to show up in the Attribute table I don't know how I can
select them to delete them.

Grateful for advice.



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