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I am new to GIS platform. I am using QGIS. I want to create lines inside map similar to border of country at a particular distance (say 100 KM). My data is in geographic coordinate system.

This is my final goal

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  • Its Geographic.
    – victorrr11
    Apr 21, 2021 at 14:02
  • See also here for an answer to a similar question with step-by-step workflow (steps 1 to 7 is preparing data only, you already have that): gis.stackexchange.com/q/383587/88814
    – Babel
    May 21, 2021 at 8:21

2 Answers 2

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I would prefer to save the layer as a new file by changing its CRS into a projected one using Right click > Export > Save Features As.... Select a suitable one for your data region. Maybe one of UTMs.

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Then use Processing Toolbox > Vector geometry > Buffer tool with negative distance value (-100000 m).

enter image description here

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  • Thanks man, this is very helpful.
    – victorrr11
    Apr 21, 2021 at 16:53
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Using a m-based CRS you may buffer geometries using negative values, thus "shrinking" them.

The CRS should be based on m (or miles or feet) and not degree since results otherwise wouldn't be equi-distant.

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