By opening a multipolygon shape file, and enabling Vertex Tool (under Edit->Edit geometry) am able to see the X, Y coordinates of the points making the polygon. When i use Vector->Geometry Tools->Extract Vertices (on a temporary layer), the vertices are defined as distance/angle - it's unclear what is considered to be the root node of these distance/angle data. Anyone with an idea on how I can locate this root reference in by data?
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1Probably layer units from the origin (coord 0/0) of the layer's CRS?– BabelCommented Nov 17, 2023 at 15:00
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1 Answer
Below the help text from the "Extract vertices" tool :
This algorithm takes a line or polygon layer and generates a point layer with points representing the vertices in the input lines or polygons. The attributes associated to each point are the same ones associated to the line or polygon that the point belongs to.
Additional fields are added to the point indicating the vertex index (beginning at 0), the vertex’s part and its index within the part (as well as its ring for polygons), distance along original geometry and bisector angle of vertex for original geometry.
Reading from that the distance/angle you get are distance along original geometry and bisector angle of vertex for original geometry.
If you want the x and y coordinate of the vertex you need to use the "Add X/Y fields to layer" tool on the layer resulting of the "Extract vertices" tool
