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I am looking to try and make a heatmap for the UK and its overseas territories that represents blue carbon sequestration and storage potential for marine ecosystems that exist there.

The problem I am having is that there is on exact datapoint files, or shaprefules I can use to do this so I will really just be using second hand information from published literature.

Can I create a heatmap "by hand" in QGIS for something like this, without having an explicit input datafile for the points of data I am using?

So I would just be putting the points and information myself onto the map one by one. All the tutorials and guides I have seen online all assume you use an input datafile, so I am really just wondering if something like this is possible and can actually be done.

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    what is "a heatmap" for you and what is the usecase for the heatmap? Is it a simple graphic that has fancy colors, or do you want to do analysis on the data? What you want to do with it will bring you in the right direction on what tools you could use.
    – til_b
    Commented Apr 5 at 11:45
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    So I would just be putting the points and information myself onto the map one by one ... and then use this layer as the input for generating the heatmap
    – JGH
    Commented Apr 5 at 11:46

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As I understand, you would like to do something very "basic":

  1. Create new shapefile: https://docs.qgis.org/3.34/en/docs/training_manual/create_vector_data/create_new_vector.html
  2. Add some features (points from published literature) to that shapefile: https://docs.qgis.org/3.34/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#adding-features
  3. Do the heatmap rendering: https://docs.qgis.org/3.34/en/docs/user_manual/working_with_vector/vector_properties.html#heatmap-renderer

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