Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-17 Thread Martin Weis 
Am 16.01.2018 um 21:05 schrieb David Shi:
> It is not merge.  I am trying to intersect two vector ShapeFiles.
> Each contains a collection of polygons.  Each collection of polygons
> cover the same geography, but has different boundaries. Can I do
> that?

Sounds like a classic intersect, did you try that already?
You get the combination of the two layers, if you have overlapping
polygons with different geometries, then all boundaries are kept and the
new polygons are bound by them (likely to be more than in each layer due
to combinations).
Attributes of both layers are appended.

If you get errors due to invalid geometries, well, then correct that
beforehand.

Martin
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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-16 Thread David Shi 
Dear Kirk,
Thanks.
I will try it out.
It is not merge.  I am trying to intersect two vector ShapeFiles.  Each 
contains a collection of polygons.  Each collection of polygons cover the same 
geography, but has different boundaries.
Can I do that?
Regards,
David 

On Tuesday, 16 January 2018, 17:16, Kirk Schmidt  
wrote:
 

  Oh, that's simple.  In the upper word menu, under Vector>Geometry Tools> 
Select Multipart to single part.  Repeat this for all you polygon layers and 
then your merge should work (I assume you are trying to merge the layers).  
  
 On 1/16/2018 12:48 PM, David Shi wrote:
  
 
 Hi, Kirk, 
  To make it simple, how to convert all polygons into simple polygons? 
  Regards, 
  David 
 
  On Tuesday, 16 January 2018, 14:09, Kirk Schmidt 
 wrote:
  
 
This usually occurs when you try to merge features that are mixed single 
and multipart lines or polygons. Simply use vector geometry tools to convert 
from one type to another.  
  
  On 1/16/2018 7:53 AM, David Shi wrote:
  
 
  How to resolving this issue?
  
 
 
  Regards, 
  David
 
  
  
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Tel (902) 922.3607
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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-16 Thread Kirk Schmidt 
Oh, that's simple.  In the upper word menu, under Vector>Geometry Tools> 
Select Multipart to single part. Repeat this for all you polygon layers 
and then your merge should work (I assume you are trying to merge the 
layers).



On 1/16/2018 12:48 PM, David Shi wrote:

Hi, Kirk,

To make it simple, how to convert all polygons into simple polygons?

Regards,

David


On Tuesday, 16 January 2018, 14:09, Kirk Schmidt 
 wrote:



This usually occurs when you try to merge features that are mixed 
single and multipart lines or polygons. Simply use vector geometry 
tools to convert from one type to another.


On 1/16/2018 7:53 AM, David Shi wrote:
How to resolving this issue?



Regards,

David




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Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email:k...@nortekresources.com 
Web:www.nortekreources.com 
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Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
Web: www.nortekreources.com

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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-16 Thread David Shi 
Hi, Kirk,
To make it simple, how to convert all polygons into simple polygons?
Regards,
David 

On Tuesday, 16 January 2018, 14:09, Kirk Schmidt  
wrote:
 

  This usually occurs when you try to merge features that are mixed single and 
multipart lines or polygons. Simply use vector geometry tools to convert from 
one type to another.  
  
 On 1/16/2018 7:53 AM, David Shi wrote:
  
 
 How to resolving this issue?
  
 
 
  Regards, 
  David
 
  
  
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 -- 
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-16 Thread Kirk Schmidt 
This usually occurs when you try to merge features that are mixed single 
and multipart lines or polygons. Simply use vector geometry tools to 
convert from one type to another.



On 1/16/2018 7:53 AM, David Shi wrote:

How to resolving this issue?



Regards,

David




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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
Web: www.nortekreources.com

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[Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

2018-01-16 Thread David Shi 
How to resolving this issue?



Regards,
David

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