Create Start and End Node

Creates start and end nodes from

a network. This modules is used to prepare drainage network data for the SWMM export.

Parameter

Name	Type	Description
view_name	STRING	Name of network view
node_name	STRING	Name of node view
tolerance	DOUBLE	Tolerance used to identify if nodes are identical default 0.01 (m)
is_downstream_upstream	BOOL	True if the downstream node is the first one defining the edge. False if the other way around. Default is true
add_height	BOOL	add height from edge

Data-stream

View	Attribute	Type	Access	Description
view_name		EDGE	read
	start_id	INT	write
	end_id	INT	write
	level_lo	DOUBLE	read	if add_height is true, pipe level downstream
	level_up	DOUBLE	read	if add_height is true, pipe level upstream
node_name		WRITE	read
	node_id	INT	write
	height	DOUBLE	write	if add_height is true

Module Name

GDALExtractNodes

Detail Description

The module iterates over all edges in the network. For each of the edges it extracts the coordinates of the start and end node as well as their height (level_lo / level_up). It checks if for these coordinates a if node exists within the defined tolerance. If no existing node is found a new node is created. The node height is defined by the lowest level of the connected edges.

Sample Code for Python Simulation

nodes = sim.add_module('GDALExtractNodes',
                       {'tolerance': 0.01,
                       'view_name': 'drainage',
                       'node_name': 'junction',
                        'is_downstream_upstream': False,
                        'add_height': True},
                       pipe_network)