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How to find the center point of MULTILINESTRING, which lies on the multiline?

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What software are you using? The more details you give, the better an answer you will receive. – sgrieve Sep 17 '12 at 13:22
I am using SQL in PostGIS. – Marko Sep 17 '12 at 13:26

2 Answers

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I have found, the function is called ST_PointOnSurface.

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Have a look at ST_Line_Interpolate_Point(). If you give 0.5 as the second parameter, it will return a point 1/2 way along the line. BTW, if your layer is a MULTILINESTRING, then "center point" really doesn't have any meaning. For example, a MULTILINESTRING can be non-contiguous or intersecting LINESTRINGs.

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