First_node

network-functions first node

syntax

  • first_node(arc_polygon_dataitem)

definition

first_node(arc_polygon_dataitem) results in a point data-item with the coordinates of the first point of an arc or polygon of argument arc_polygon_dataitem.

description

Use the arc2segm function to split an arc in segment.

applies to

data item arc_polygon_dataitem with fpoint or dpoint value-type and composition type arc or polygon.

example

attribute<fpoint> first_node (Road) := first_node(road/geometry);
road/geometry first_node
{2 {399246, 112631}{398599, 111866}} {399246, 112631}
{3 {398599, 111866}{399495, 111924} {401801,111524}} {398599, 111866}
{2 {401529, 114921}{398584, 114823}} {401529, 114921}

domain Road, nr of rows = 3

see also