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Two input GIS layers can be used, these are the branch lines and cut lines. The branch line is split into the 1d_nwk layer, a new 1D channel is created for each section. The GIS attributes of these are defined in the sections below.
===Branch Lines===
Attributes for the branch line are:
{| align="center" class="wikitable"
! Attribute (type)
! width=80% | Description
|-
|Name (character 10)|| Sets the branch name, unique chainage identifier is added to all output channels.
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|n_or_nF (float)|| Sets the output "n_or_nF" attribute for all output channels in the 1d_nwk layer.
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|UCS (float)|| Sets the "UCS" attribute for all output channels in the 1d_nwk layer.
|}
===Cut Lines===
===EGC commands===
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! Command
! width=
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|Read GIS Branch == <1d_br GIS file>|| Reads the branch lines, these are described above.
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|Read GIS XS == <1d_cut GIS file>|| Reads the cross-section cut lines, these are described above.
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|Read GIS FLC == <GIS file>|| Optional GIS layer of polygons that can be used to specify form loss coefficients to the 1d_nwk layer. A single GIS (float) attribute is required. A FLC value of greater than 0 will be split between all 1d_nwk channels within the region. A FLC value of less than 0, will apply the absolute value to all channels within the polygon. For example if an FLC value of -0.1 is specified, all channels that fall within the polygon will have a form_loss attribute of 0.1. If a channel falls within multiple polygons, the form loss values will be added.
|Set XS dx|| Sets the default distance across section to extract elevations and materials data. This can be specified on the cut lines as detailed above.▼
Reads the polygons off losses from GIS layer. cross-section cut lines, these are described above.
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▲|Set XS dx == <distance>|| Sets the default distance across section to extract elevations and materials data. This can be specified on the cut lines as detailed above.
|Set XS Z|| Sets the elevation for all points in all cross-sections.▼
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|Set XS
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▲|Set XS
|Read Grid Z|| Read elevations from DEM and assign this to all cross-section extraction points that fall within active DEM pixels.▼
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|Read Grid
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▲|Read Grid
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|Write XS == ON | {OFF}|| Turns on or off the writing of the 1d_xs layer. The default is off.
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|Write NWK == ON | {OFF}|| Turns on or off the writing of the 1d_nwk layer. The default is off.
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|Output XS == <output gis layer> || Sets the output GIS layer for the 1D cross-sections.
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|Output NWK == <output gis layer> || Sets the output GIS layer for the 1D channel cross-sections.
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|Output NWK == <output gis layer> || Sets the output GIS layer for the 1D channel cross-sections.
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|FLC per Unit Length == <form loss per unit length> || The form loss per unit length is written to the "exit_loss" attribute of all 1d_nwk channels.
|}
Example:<br>
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