[Qgis-user] How to generate intersect areas properly in QGIS with use of Grass v.overlap?

Give two vectorised area data sets,  How to generate intersect areas properly in QGIS with use of Grass v.overlap? Regards, David___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Problems with Intersection by using Grass's v.overlay

I encountered following problems with Intersection by using Grass's v.overlay. I used 2 vector area maps to create a new map through intersection (or option used). The number of new polygonal areas of the output each time is different.    Inconsistent output. I kept encountering Error 6:  Failed

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

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 <k...@nortekresources.com> wrote: This usually occurs when you try

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

lygons. 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 ___ Qgis-user mailing list Qgis-user@lists.osg

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

How to resolving this issue? Regards, David ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Areal Interpolation in QGIS

Is there any Areal Interpolation code in QGIS? Regards, David ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Code for Intersection

In QGIS's geoalgorithms, there is an Intersection in Vector overlay tools. Can anyone tell me where to find the original code? Regards. David___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] writing out a vector shape file - no error and no file

QgsVectorFileWriter.writeAsVectorFormat(outlayer, "my_shapes.shp", "system", \QgsCoordinateReferenceSystem(4326), "ESRI Shapefile") I used above command, after capturing a layer as outlayer as the result of processing. However, there is no file, and no error message. Can anyone help? Regards.

Re: [Qgis-user] How to set python search path for standalone script?

Hello, Jurgen, It only worked once.  Then, it can not find other modules. How to set a top level path, so that Python will look for modules in any sub-directories. Regards. David On Wednesday, 4 May 2016, 13:45, David Shi <davidg...@yahoo.co.uk> wrote: Do you mean run python-qg

Re: [Qgis-user] How to set python search path for standalone script?

Do you mean run python-qgis.bat in command window?Then, run my script?Regards.David On Wednesday, 4 May 2016, 13:14, Jürgen E. Fischer <j...@norbit.de> wrote: Hi David, On Wed, 04. May 2016 at 12:07:51 +, David Shi wrote: > Thank you. > I am using QGIS in Windows.  Do I

Re: [Qgis-user] How to set python search path for standalone script?

On Wednesday, 4 May 2016, 12:50, Jürgen E. Fischer <j...@norbit.de> wrote: Hi David, On Wed, 04. May 2016 at 11:43:24 +, David Shi wrote: > How to set python search path for standalone script? > > I am writing a standalone script, but it can not import qgis.core an

Re: [Qgis-user] How to set python search path for standalone script?

Hello, Jürgen Thank you. I am using QGIS in Windows.  Do I need to set paths? Regards. David On Wednesday, 4 May 2016, 12:49, Jürgen E. Fischer <j...@norbit.de> wrote: Hi David, On Wed, 04. May 2016 at 11:43:24 +, David Shi wrote: > How to set python search path for s

[Qgis-user] How to set python search path for standalone script?

How to set python search path for standalone script? I am writing a standalone script, but it can not import qgis.core and other processing.   modules. Can any one advise me? Regards. David___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info:

[Qgis-user] References to writing of standalone QGIS script

Hello, Can anyone provide references for writing standalone QGIS script? There are a lot of confusing posts on the Internet, regarding that Python cannot find qgis.core and etc. Thank you in advance. Regards. David___ Qgis-user mailing list