I have so big big data (like about 60 Gb.) and it seems to have much unnecessary pseudo nodes.

I would like to remove them using PostGIS or QGIS without simplifying or changing its original shape (Simplification might helpful though it changes the original shape and this is not what I want... also, ArMap DataReviewer is not going to be helpful or GT Tools such as ArcMap Addin)

What function names should I look into? I have polygons and polylines that need to be worked done.

Finding pseudo nodes in free GIS software?

this might be the closest answer that i am looking for but this is related to lines and i need to delete them :(

examples of Pseudo Nodes in Polyline is illustrated below. (and the second picture, i need to apply this to polygons too)

enter image description here enter image description here

an example of Pseudo Nodes in Polygon is illustrated below

enter image description here

so, the definition of Pseudo Nodes here is unnecessary nodes in a shape. Also, with or without the pseudo nodes, the shape will still remain the same.

For instance, straight line only needs end nodes (2 nodes) but somehow there is a couple of extra nodes on the line (for some reason. maybe editting error), i would like to remove them.

  • 1
    Define what you mean with pseudo nodes. Degree of two vertices en.wikipedia.org/wiki/Degree_(graph_theory), or?
    – user30184
    Commented Apr 16, 2018 at 15:48
  • @user30184 sure sure i will edit my post
    – Pil Kwon
    Commented Apr 16, 2018 at 15:50
  • Did you try this old trick: buffer out by a very small amount, then buffer in by the same amount
    – csk
    Commented Apr 19, 2018 at 18:45

1 Answer 1


It seem that what you call a pseudo-node is when there is two connected line where you only want a single line (the last vertice of the first line is superposed to the first vertice of the second line) if I understand well you want to mergedissolve some (or all) of the line to remove the duplicate vertice.

you may have a look at the "Merge lines", "Aggregate" or "Dissolve" tool to see if they fit your need

  • oh, dissolve is the function i should look into.
    – Pil Kwon
    Commented Apr 16, 2018 at 16:08
  • I guess without the shape loss (such as without simplification), this is the best solution I have found so far. Thank you for your help.
    – Pil Kwon
    Commented Apr 19, 2018 at 1:51

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