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I have a point layer for the cold air flow in specific region. I would like to simplify all the single points to a polygon shape as to be able to join the data with other spatial data.enter image description here My way is pretty complicated (buffer the points e.g.400m, dissolve, simplify) because I have to extract the single values (orange, blue, light blue) and then do it with all these single values separately. Afterwards there is the need to create differences in order to avoid doubles. I wonder if somebody knows a more convenient way.

marked as duplicate by Richard Law, Fran Raga, Jochen Schwarze, JGH, whyzar May 28 at 13:52

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  • How can your point data not be joined with other data? – Erik May 24 at 8:59
  • ..we want to define the whole area of e.g. yellow arrows and combine (union) them with other polygones so that we have a defined area with the attributes yellow+nature reserve+arable land + etc... – oppia04 May 24 at 9:11
  • frankly, not but it hits my point exactly. I will test it out. Thank you so far and sorry for missing it out. – oppia04 May 24 at 9:21
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    I think you maybe want a concave hull (alpha shape) rather than convex – MappaGnosis May 24 at 11:02
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Assuming that all the points are in the same layer, and they already an attribute with the desired unique values (classes) I would do the following:

  1. Create Voronoi polygons for the point layer (this avoids overlapping)
  2. Dissolve the polygons using the mentioned attribute to dissolve adjacent polygons of the same class.
  3. Run multiple parts to single parts to split the multi-polygons into single part polygons
  4. Clip the result to the area of interest
  • this is smart, thank you! – oppia04 May 24 at 11:59

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