Hi Salvatore,
You could try:

1.       Selecting/Highlighting Polygon 1, which should also highlight the area 
you want to cut into area 4.

2.       Using the Split Features tool, you can then create a cutline to clip 
it successfully, something like what’s shown below in green, should work.

The polygons 2 and 3 shouldn’t be altered, as the Split feature tool will only 
alter the Selected/Highlighted Polygon 1

[cid:[email protected]].

Hope that helps.
Regards,

Richard



——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/[email protected]

Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/

——
MSc GIS, FME Certified Professional

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://https://gov.ie/opw<https://www.opw.ie>

——
Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/<https://www.opw.ie/en/disclaimer/>
From: QGIS-User <[email protected]> On Behalf Of Prisma via 
QGIS-User
Sent: 24 July 2023 10:59
To: [email protected]
Subject: [Qgis-user] draw polygon

Hello,

I need to draw a polygon, the blue one indicated in the figure below:

[cid:[email protected]]

I tried with the split features toll but I received an error. Any solution?

Thank you.

Regards,

Salvatore


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