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    By David Crowther

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    Question:

    How can I create holes within an existing spatial object?

    Answer:

    You may have a polygon layer where you wish to remove parts of it over time e.g. editing a Section 106 polygon to remove certain areas as a development progresses.

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    These types of edits can easily be done within a desktop GIS such as QGIS

    Once you have opened the source file e.g. a SQL Database Table, make the layer editable and then open the Advanced Digitising Toolbar.

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    From the Advanced Digitising Toolbar choose the ADD RING tool and draw an area to cut out of the existing polygon feature.

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    Once the Ring has been digitised the existing polygon will be updated with the area now removed.

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    Save the change to the source file and your data will be updated for all users e.g. webGIS users.

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