Hello,
if I import a shape (414 features) with v.in.ogr.qgis I get output with 594 features. I had read the problem is, that a boundary line between two polygons get saved double. How can I manage to save as one boundary line between two polygons?
Thanks a lot in advance!
Steffen
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Hello,
looks like Your data are coming from non-topological vector storage
(Shapefile?). Cleanness of data stored in non-topological formats
(i.e. Shapefile) depend on data creation software abilities to produce
cliean-look data and not are enforced by data storage, as it is in
GRASS.
Without seeing more information, my guess would be - You imported
shapefile with areas into GRASS, still they had slivers and thus
feature count has increased. Only way out is to clean data with
v.clean and friends or by hand.
Maris.
http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
2011/1/27, mails-foren@gmx-topmail.de <mails-foren@gmx-topmail.de>:
Hello,
if I import a shape (414 features) with v.in.ogr.qgis I get output with 594
features. I had read the problem is, that a boundary line between two
polygons get saved double. How can I manage to save as one boundary line
between two polygons?Thanks a lot in advance!
Steffen
--
GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
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Hello Maris,
thanks a lot for replying.
Yes, I imported an esri shapefile. I'd tried to clean data with v.clean and with many different grass clean modules, without any success.
Any other idea how to solve this issue? Maybe there is a method to import esri shapefiles without saving double the boundary?
Steffen
-------- Original-Nachricht --------
Datum: Thu, 27 Jan 2011 21:35:17 +0200
Von: Maris Nartiss <maris.gis@gmail.com>
An: mails-foren@gmx-topmail.de
CC: grass-user@lists.osgeo.org
Betreff: Re: [GRASS-user] problem: boundary lines double
Hello,
looks like Your data are coming from non-topological vector storage
(Shapefile?). Cleanness of data stored in non-topological formats
(i.e. Shapefile) depend on data creation software abilities to produce
cliean-look data and not are enforced by data storage, as it is in
GRASS.Without seeing more information, my guess would be - You imported
shapefile with areas into GRASS, still they had slivers and thus
feature count has increased. Only way out is to clean data with
v.clean and friends or by hand.Maris.
http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
2011/1/27, mails-foren@gmx-topmail.de <mails-foren@gmx-topmail.de>:
> Hello,
>
> if I import a shape (414 features) with v.in.ogr.qgis I get output with
594
> features. I had read the problem is, that a boundary line between two
> polygons get saved double. How can I manage to save as one boundary line
> between two polygons?
>
> Thanks a lot in advance!
>
> Steffen
> --
> GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
> gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
--
NEU: FreePhone - kostenlos mobil telefonieren und surfen!
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On Tue, Feb 1, 2011 at 4:43 PM, <mails-foren@gmx-topmail.de> wrote:
Hello Maris,
thanks a lot for replying.
Yes, I imported an esri shapefile. I'd tried to clean data with v.clean and with many different grass clean modules, without any success.
Any other idea how to solve this issue? Maybe there is a method to import esri shapefiles without saving double the boundary?
The imported shapefile should be clean if v.in.ogr was not used with
the -c flag, i.e. v.in.ogr did topological cleaning. Duplicate
boundaries should not exist when using v.in.ogr with default settings.
Markus M
-------- Original-Nachricht --------
Datum: Thu, 27 Jan 2011 21:35:17 +0200
Von: Maris Nartiss <maris.gis@gmail.com>
An: mails-foren@gmx-topmail.de
CC: grass-user@lists.osgeo.org
Betreff: Re: [GRASS-user] problem: boundary lines doubleHello,
looks like Your data are coming from non-topological vector storage
(Shapefile?). Cleanness of data stored in non-topological formats
(i.e. Shapefile) depend on data creation software abilities to produce
cliean-look data and not are enforced by data storage, as it is in
GRASS.Without seeing more information, my guess would be - You imported
shapefile with areas into GRASS, still they had slivers and thus
feature count has increased. Only way out is to clean data with
v.clean and friends or by hand.Maris.
http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
2011/1/27, mails-foren@gmx-topmail.de <mails-foren@gmx-topmail.de>:
> Hello,
>
> if I import a shape (414 features) with v.in.ogr.qgis I get output with
594
> features. I had read the problem is, that a boundary line between two
> polygons get saved double. How can I manage to save as one boundary line
> between two polygons?
>
> Thanks a lot in advance!
>
> Steffen
> --
> GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
> gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>--
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_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
Hello Markus,
thank you for your advice. Unfortunatly its not possible for me to get clean data. If I import an esri file (16 features) with the command v.in.ogr -o (the o flag is for the locations projection) I get a file with 58 features.
Below I attached the output:
Best regards
v.in.ogr -o dsn=/home/BL2009/Bundeslaender.shp output=test4
Over-riding projection check
Layer: Bundeslaender
Importing map 16 features...
Area size [1.8e-05], area not imported
Area size [8.4e-05], area not imported
Area size [6.3e-05], area not imported
Area size [1.6e-05], area not imported
Area size [2.1e-05], area not imported
Area size [6.7e-06], area not imported
Area size [6.1e-06], area not imported
Area size [2.4e-05], area not imported
Area size [7.2e-05], area not imported
Island size [8.3e-05], island not imported
Island size [5.5e-06], island not imported
Area size [5.5e-06], area not imported
Area size [8.3e-05], area not imported
Area size [5.6e-05], area not imported
Area size [5.5e-05], area not imported
Area size [5.1e-06], area not imported
Island size [5.6e-05], island not imported
Area size [1.1e-05], area not imported
Area size [1.6e-05], area not imported
Area size [8.8e-06], area not imported
Area size [5.5e-06], area not imported
Area size [1.4e-05], area not imported
Area size [5.5e-06], area not imported
Area size [8.5e-06], area not imported
Area size [1.0e-05], area not imported
Area size [3.5e-05], area not imported
Area size [1.3e-05], area not imported
Area size [9.0e-06], area not imported
Area size [3.8e-05], area not imported
Area size [1.5e-05], area not imported
Area size [6.9e-06], area not imported
Area size [5.5e-06], area not imported
Area size [3.1e-05], area not imported
Area size [6.4e-05], area not imported
Area size [6.5e-06], area not imported
Area size [1.3e-05], area not imported
Area size [2.2e-05], area not imported
Area size [7.0e-06], area not imported
Area size [9.3e-06], area not imported
Area size [7.1e-06], area not imported
Area size [1.2e-05], area not imported
Area size [1.4e-05], area not imported
Area size [6.0e-05], area not imported
Area size [6.2e-06], area not imported
Area size [1.9e-05], area not imported
Area size [6.4e-06], area not imported
Area size [3.5e-05], area not imported
Area size [5.9e-06], area not imported
Area size [2.5e-05], area not imported
Area size [1.2e-05], area not imported
Area size [7.8e-06], area not imported
Area size [1.0e-05], area not imported
Area size [1.4e-05], area not imported
Area size [8.2e-06], area not imported
Area size [2.2e-05], area not imported
Area size [6.2e-06], area not imported
Area size [2.2e-05], area not imported
Area size [3.0e-06], area not imported
Area size [6.7e-06], area not imported
Area size [6.2e-06], area not imported
Area size [8.7e-05], area not imported
Area size [5.7e-06], area not imported
Area size [6.1e-05], area not imported
Area size [2.2e-05], area not imported
Island size [1.6e-05], island not imported
Island size [1.1e-05], island not imported
Island size [8.8e-06], island not imported
Island size [2.2e-05], island not imported
-----------------------------------------------------
Building topology for vector map ...
Registering primitives...
61 primitives registered
197855 vertices registered
Building areas...
59 areas built
59 isles built
Attaching islands...
Attaching centroids...
Number of nodes: 60
Number of primitives: 61
Number of points: 0
Number of lines: 0
Number of boundaries: 61
Number of centroids: 0
Number of areas: 59
Number of isles: 59
Number of incorrect boundaries: 2
Number of areas without centroid: 59
-----------------------------------------------------
Cleaning polygons, result is not guaranteed!
Building topology for vector map ...
Number of nodes: 60
Number of primitives: 61
Number of points: 0
Number of lines: 0
Number of boundaries: 61
Number of centroids: 0
Number of areas: -
Number of isles: -
-----------------------------------------------------
Break polygons:
-----------------------------------------------------
Remove duplicates:
-----------------------------------------------------
Break boundaries:
-----------------------------------------------------
Remove duplicates:
-----------------------------------------------------
Clean boundaries at nodes:
-----------------------------------------------------
Change dangles to lines:
-----------------------------------------------------
Remove bridges:
-----------------------------------------------------
Building topology for vector map ...
Building areas...
60 areas built
45 isles built
Attaching islands...
Number of nodes: 88
Number of primitives: 163
Number of points: 0
Number of lines: 0
Number of boundaries: 163
Number of centroids: 0
Number of areas: 60
Number of isles: 45
Number of areas without centroid: 60
Layer: Bundeslaender
-----------------------------------------------------
-----------------------------------------------------
Building topology for vector map ...
Registering primitives...
161 primitives registered
155800 vertices registered
Building areas...
60 areas built
45 isles built
Attaching islands...
Attaching centroids...
Number of nodes: 146
Number of primitives: 161
Number of points: 0
Number of lines: 0
Number of boundaries: 103
Number of centroids: 58
Number of areas: 60
Number of isles: 45
Number of areas without centroid: 2
-----------------------------------------------------
119 input polygons
Total area: 4.596540e+01 (60 areas)
Overlapping area: 0.000000e+00 (0 areas)
Area without category: 4.309415e-03 (2 areas)
Successfully finished
-------- Original-Nachricht --------
Datum: Wed, 2 Feb 2011 15:42:15 +0100
Von: Markus Metz <markus.metz.giswork@googlemail.com>
An: mails-foren@gmx-topmail.de
CC: grass-user@lists.osgeo.org
Betreff: Re: [GRASS-user] problem: boundary lines double
On Tue, Feb 1, 2011 at 4:43 PM, <mails-foren@gmx-topmail.de> wrote:
>
> Hello Maris,
>
> thanks a lot for replying.
> Yes, I imported an esri shapefile. I'd tried to clean data with v.clean
and with many different grass clean modules, without any success.
> Any other idea how to solve this issue? Maybe there is a method to
import esri shapefiles without saving double the boundary?
>
The imported shapefile should be clean if v.in.ogr was not used with
the -c flag, i.e. v.in.ogr did topological cleaning. Duplicate
boundaries should not exist when using v.in.ogr with default settings.Markus M
>
> -------- Original-Nachricht --------
>> Datum: Thu, 27 Jan 2011 21:35:17 +0200
>> Von: Maris Nartiss <maris.gis@gmail.com>
>> An: mails-foren@gmx-topmail.de
>> CC: grass-user@lists.osgeo.org
>> Betreff: Re: [GRASS-user] problem: boundary lines double
>
>> Hello,
>> looks like Your data are coming from non-topological vector storage
>> (Shapefile?). Cleanness of data stored in non-topological formats
>> (i.e. Shapefile) depend on data creation software abilities to produce
>> cliean-look data and not are enforced by data storage, as it is in
>> GRASS.
>>
>> Without seeing more information, my guess would be - You imported
>> shapefile with areas into GRASS, still they had slivers and thus
>> feature count has increased. Only way out is to clean data with
>> v.clean and friends or by hand.
>>
>>
>> Maris.
>>
>> http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
>>
>>
>> 2011/1/27, mails-foren@gmx-topmail.de <mails-foren@gmx-topmail.de>:
>> > Hello,
>> >
>> > if I import a shape (414 features) with v.in.ogr.qgis I get output
with
>> 594
>> > features. I had read the problem is, that a boundary line between two
>> > polygons get saved double. How can I manage to save as one boundary
line
>> > between two polygons?
>> >
>> > Thanks a lot in advance!
>> >
>> > Steffen
>> > --
>> > GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
>> > gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
>> > _______________________________________________
>> > grass-user mailing list
>> > grass-user@lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/grass-user
>> >
>
> --
> NEU: FreePhone - kostenlos mobil telefonieren und surfen!
> Jetzt informieren: http://www.gmx.net/de/go/freephone
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
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On Sat, Feb 26, 2011 at 1:46 PM, <mails-foren@gmx-topmail.de> wrote:
Hello Markus,
thank you for your advice. Unfortunatly its not possible for me to get clean data. If I import an esri file (16 features) with the command v.in.ogr -o (the o flag is for the locations projection) I get a file with 58 features.
Below I attached the output:v.in.ogr -o dsn=/home/BL2009/Bundeslaender.shp output=test4
Over-riding projection check
Layer: Bundeslaender
Importing map 16 features...
[...]
Number of nodes: 146
Number of primitives: 161
Number of points: 0
Number of lines: 0
Number of boundaries: 103
Number of centroids: 58
Number of areas: 60
Number of isles: 45
Number of areas without centroid: 2
-----------------------------------------------------
119 input polygons
Total area: 4.596540e+01 (60 areas)
Overlapping area: 0.000000e+00 (0 areas)
Area without category: 4.309415e-03 (2 areas)
Successfully finished
A late response:
The 16 features are most probably multipolygons, because a total of
119 polygons are imported, e.g. islands are separate polygons but can
belong to the same Bundesland. All the warnings like e.g. "Area size
[1.8e-05], area not imported" indicate that the input shapefile was
not clean and these small areas are sliver or overlapping polygons
that are created when e.g. reprojecting or simplifying a
non-topological vector. The result of topology building at the end
indicates that the imported vector is clean.
Markus M
-------- Original-Nachricht --------
Datum: Wed, 2 Feb 2011 15:42:15 +0100
Von: Markus Metz <markus.metz.giswork@googlemail.com>
An: mails-foren@gmx-topmail.de
CC: grass-user@lists.osgeo.org
Betreff: Re: [GRASS-user] problem: boundary lines doubleOn Tue, Feb 1, 2011 at 4:43 PM, <mails-foren@gmx-topmail.de> wrote:
>
> Hello Maris,
>
> thanks a lot for replying.
> Yes, I imported an esri shapefile. I'd tried to clean data with v.clean
and with many different grass clean modules, without any success.
> Any other idea how to solve this issue? Maybe there is a method to
import esri shapefiles without saving double the boundary?
>
The imported shapefile should be clean if v.in.ogr was not used with
the -c flag, i.e. v.in.ogr did topological cleaning. Duplicate
boundaries should not exist when using v.in.ogr with default settings.Markus M
>
> -------- Original-Nachricht --------
>> Datum: Thu, 27 Jan 2011 21:35:17 +0200
>> Von: Maris Nartiss <maris.gis@gmail.com>
>> An: mails-foren@gmx-topmail.de
>> CC: grass-user@lists.osgeo.org
>> Betreff: Re: [GRASS-user] problem: boundary lines double
>
>> Hello,
>> looks like Your data are coming from non-topological vector storage
>> (Shapefile?). Cleanness of data stored in non-topological formats
>> (i.e. Shapefile) depend on data creation software abilities to produce
>> cliean-look data and not are enforced by data storage, as it is in
>> GRASS.
>>
>> Without seeing more information, my guess would be - You imported
>> shapefile with areas into GRASS, still they had slivers and thus
>> feature count has increased. Only way out is to clean data with
>> v.clean and friends or by hand.
>>
>>
>> Maris.
>>
>> http://grass.osgeo.org/grass64/manuals/html64_user/v.clean.html
>>
>>
>> 2011/1/27, mails-foren@gmx-topmail.de <mails-foren@gmx-topmail.de>:
>> > Hello,
>> >
>> > if I import a shape (414 features) with v.in.ogr.qgis I get output
with
>> 594
>> > features. I had read the problem is, that a boundary line between two
>> > polygons get saved double. How can I manage to save as one boundary
line
>> > between two polygons?
>> >
>> > Thanks a lot in advance!
>> >
>> > Steffen
>> > --
>> > GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
>> > gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
>> > _______________________________________________
>> > grass-user mailing list
>> > grass-user@lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/grass-user
>> >
>
> --
> NEU: FreePhone - kostenlos mobil telefonieren und surfen!
> Jetzt informieren: http://www.gmx.net/de/go/freephone
> _______________________________________________
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
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