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I am trying to split features in a shape file but I got an error message. I've had cases in other shape files where the message also appear. I then run the "Check Validity" option and rearrange the nodes and it solves the problem. However, this time, the outputs indicates that the geometry is valid and it can't split a feature. Could you please let me know how to solve the problem?

Please find below a picture of the polygon and the wkt geometry (3857):

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polygon_map

  • judging by your coordinates, the following follows: the first, the polygon is not closed, and the second most likely you do not have a part of the southern and eastern coordinates, which should convert the list of coordinates into a polygon ... – Cyril Aug 4 '19 at 15:07
  • Hi Cyril, thank you for your message. It seems like I had not copied the entire polygon coordinates, apologies for that. I have now edited and updated the GPS coordinates. Please let me know if it is now closed and includes the southern and eastern coordinates. Thank you – spanishnick Aug 4 '19 at 15:36
  • This time you downloaded the list of coordinates from several polygons, and from them it will be possible to create many polygons ... – Cyril Aug 4 '19 at 17:01
  • Thanks Cyril, sorry I am relatively new in QGIS. Based on what you are saying, the updated list of GPS coordinates correspond to several polygons. However, I don't understand why I cannot split the polygon by feature if the wkt_geometry generates multiple polygons that are closed. Thanks for your help – spanishnick Aug 4 '19 at 17:08
  • Most likely the first polygon represents the polygon that you need, the second, third and fourth are polygon artifacts and you need to delete them ... – Cyril Aug 4 '19 at 17:21
5

You can't split "features" because there is only one feature in your polygon. So, I used QuickWKT QGIS plugin to visualize that complete polygon:

enter image description here

Near at bottom, there are several artifacts, however, three of them are holes (not features).

enter image description here

They can be eliminated with "Delete Ring" tool from Advanced Digitizing Toolbar (see following image).

enter image description here

Left artifact of above image is not a hole; as it can be observed at following image:

enter image description here

In this case you need to move or delete corresponding nodes.

  • Perfect, thank you xunilk! I'm now able to split the polygon. – spanishnick Aug 4 '19 at 19:09
0

Follow this link to download the file with the * .shp resolution with the name poly and use it in your work,

I fixed the sidebar at the bottom of the polygon.

https://drive.google.com/file/d/1dyF69pgxOZMuNCrHOY9Zz_aWj9unLSsI/view?usp=sharing

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