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I am trying to create a buffer of 10 kilometers around each dot already uploaded. The problem is that these buffers seem to be unreasobly larger than 10km. (Portugal). I have tried to use multiple multiple CRS but it doesn't work. Some people suggested to save layers as .shp but I can't see how to do that (maybe there was an update?). I have been using EPSG:4326 - WGS 84. I have tried some others and couldn't solve the issue.

I have read multiple suggestions in other Questions but couldn't solve so far.

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  • Welcome to GIS SE. As a new user, please take the Tour. Please Edit the Question to provide details on exactly how you are attempting this task, and provide a screenshot or the resulting geometry (and report your measurement thereof). Do NOT use Web Mercator to make any distance calculations, for it is ALWAYS wrong in distance.
    – Vince
    Commented Jan 13, 2023 at 18:27
  • Always try put some example of data, like a printscreen or a code to simplify your question Commented Jan 13, 2023 at 18:27
  • See this answer how to create correct buffer size, regardless of CRS: gis.stackexchange.com/a/438809/88814
    – Babel
    Commented Jan 13, 2023 at 22:12

1 Answer 1

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Any tool that uses distances must use a projected and non-geographic reference system. Reproject the geometry to the proper EPSG which should work correctly

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    For example EPSG:27429
    – Bera
    Commented Jan 13, 2023 at 18:25
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    Yes BERA, As I didn't know which system, I preferred not to suggest so as not to confuse Commented Jan 13, 2023 at 18:26
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    And certainly not EPSG:3857
    – Vince
    Commented Jan 13, 2023 at 18:27
  • I have now changed the project CRS to ESPG:27429. I changed the World Map and the layer as well. When I create the buffer the same thing happens... When you say "reproject" is there anything I should be particularly careful with?
    – Nuno Can
    Commented Jan 13, 2023 at 18:38
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    Thanks @BERA, I have now been able to sort it!
    – Nuno Can
    Commented Jan 13, 2023 at 19:00

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