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Two input GIS layers can be used, these are the branch lines (channels) and cut lines (cross sections). 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===
The branch lines are split into channels using the cross-section cut lines detailed below. A number of channel characteristics can be set for branch lines. The required
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|ChanType (character 4)|| Sets the "Type" attribute for all output channels in the 1d_nwk layer. If left blank a default channel type of "S" is applied.
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===Cut Lines===
For each line in the cut line layer a cross-section will be extracted and output into .csv file format ready for use in TUFLOW. A number of options can be set for each cut line. Attributes for the cross-section cut line are:
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