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

[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 <kirk at nortekresources.com> 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 <kirk at nortekresources.com> 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
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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: kirk at nortekresources.com
Web: www.nortekreources.com 

   

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