[Qgis-user] Convert PNG file to vector file

[krishna Ayyala via QGIS-User]

Hello,
I have a png file. This has polygons with 36 categories as shown in the
legend. Is it possible to convert this file to a vector file such as .shp
or gpkg file? When I open the attribute table, it should be able to
distinguish between each of these 36 categories. Below is the weblink to
png. Can anyone help me with this please?

Regards.

ListofProjects.png (2200×1700) (oklahoma.gov)

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[Qgis-user] Convert PNG file to vector file

[krishna Ayyala via QGIS-User]

I am reposting this question.Can anyone please help?

Hello,
I have a png file. This has polygons with 36 categories as shown in the
legend. Is it possible to convert this file to a vector file such as .shp
or gpkg file? When I open the attribute table, it should be able to
distinguish between each of these 36 categories. Below is the weblink to
png. Can anyone help me with this please?

Regards.

ListofProjects.png (2200×1700) (oklahoma.gov)

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Re: [Qgis-user] Convert PNG file to vector file

[WhereGroup]

No, that would be a very hard computer vision problem because of the 
styles and overlays. You will be faster and more accurate if you 
recreate an approximation of the hexagonal grid and then retrace all 
polygons manually using those cells.


Am 25.10.23 um 13:37 schrieb krishna Ayyala via QGIS-User:

I am reposting this question.Can anyone please help?

Hello,
I have a png file. This has polygons with 36 categories as shown in 
the legend. Is it possible to convert this file to a vector file such 
as .shp or gpkg file? When I open the attribute table, it should be 
able to distinguish between each of these 36 categories. Below is the 
weblink to png. Can anyone help me with this please?


Regards.

ListofProjects.png (2200×1700) (oklahoma.gov) 



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Re: [Qgis-user] Convert PNG file to vector file

[krishna Ayyala via QGIS-User]

Thanks for the reply Simon. The Polygonize tool did not work for me.

Regards.

On Wed, Oct 25, 2023 at 5:49 AM Simon Dietmann  wrote:

> Hi Krishna,
>
>
>
> have you tried the polygonize algorithm? Raster ► Conversion ► Polygonize
> (Raster to Vector)
>
>
> https://docs.qgis.org/3.28/en/docs/training_manual/complete_analysis/raster_to_vector.html
>
> Some post processing may be necessary.
>
>
>
> cheers, Simon
>
>
>
>
>
>
>
> i.A. Simon Dietmann
> Projektleiter | Geograph
>
> PGNU Planungsgesellschaft Natur & Umwelt mbH
> Amtsgericht Frankfurt am Main, HRB 111938;
> Geschäftsführer: Dr. Benjamin Hill, Johannes Christoph Kress, Alexander
> von Küchler
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>
> *Von:* QGIS-User  * Im Auftrag von *krishna
> Ayyala via QGIS-User
> *Gesendet:* Mittwoch, 25. Oktober 2023 13:37
> *An:* qgis-user 
> *Betreff:* [Qgis-user] Convert PNG file to vector file
>
>
>
> I am reposting this question.Can anyone please help?
>
>
>
> Hello,
>
> I have a png file. This has polygons with 36 categories as shown in the
> legend. Is it possible to convert this file to a vector file such as .shp
> or gpkg file? When I open the attribute table, it should be able to
> distinguish between each of these 36 categories. Below is the weblink to
> png. Can anyone help me with this please?
>
>
>
> Regards.
>
>
>
> ListofProjects.png (2200×1700) (oklahoma.gov)
> <https://atpscan.global.hornetsecurity.com/index.php?atp_str=GYN90zoJeaFh811GmAOBZkS2BWvrDu0iRZzKqr1WbSyKhUsdQsbism_XYyxg1BeOfShdSVDEYIyNr6iG4hpBVspG11qDIXgFv8txd2pBoxU0XEfyHeakt4e4JDoEI00Er4kX-t8frtjvSMVO2YN4hp7vRZL2dKQtPvLWTI74ZLBSuiFowFrmHeY_GIxZ68nLweyq6IG-j8gRDFOe3W78OajBXElg3uJ_dLmHgdA4nYePmvDV7ZRN4RmGmTCu_3y5AZqP0jHFy3lvEuY4Zk1JWm07A5OpjX2gHAYKuk3hDwg-6qqK0a13iAOptDHSeySbFK309b6f3NHp04GB7p9ZQ72eBe_FesF6i3IEEl1094nK39rZDNcpY3Qk4PYiXxpoxegkYXwNdLah3C7QdDlfix9lqzv3pQY6z-5qURImx6bPbqojOjoj6J0knGN7Qa0eJY3gIzo6I-RhmBmvSVheFRSS9DDlX7Q>
>
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Re: [Qgis-user] Convert PNG file to vector file

[David Strip via QGIS-User]

  
  
On 10/25/2023 7:46 AM, krishna Ayyala via QGIS-User wrote:

  
  
Thanks for the reply Simon. The
Polygonize tool did not work for me.

  
Regards.

  

It's not surprising that polygonize didn't work. Polygonize
recognizes regions of constant color. The patterned fills of the
regions in your file will completely defeat polygonize. The fact
that regions overlap only further complicates the matter. You will
either have to manually digitize the image or find someone who has
the files that were used to generate the map.
  

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