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=Introduction=
The native non-Graphical User Interface (GUI) form of TUFLOW uses Geographic Information System (GIS) files for its spatial inputs. TUFLOW requires specific GIS file formats associated with specific TUFLOW commands. For example, the '''1d_nwk_empty1d_zsh_empty''' file associated with the <font color="blue"><tt>Read GIS NetworkZ Shape</tt></font> <font color="red"><tt>==</tt></font> command requires the following data fields:
[[File: TUFLOW_Empty_File_Shapefile_FormatTUFLOW_Empty_File_ZShape_Format.pngPNG|right]]
<ol>
<li> ID
<li> Type
<li> Ignore
<li> UCS
<li> Len_or_ANA
<li> n_nF_Cd
<li> US_Invert
<li> DS_Invert
<li> Form_Loss
<li> pBlockage
<li> Inlet_Type
<li> Conn_1D_2D
<li> Conn_No
<li> Width_or_D
<li> Height_or
<li> Number_of
<li> HConF_or_W
<li> WConf_or_W
<li> EntryC_or
<li> ExitC_or_W
</ol>
Because of thisthe file format requirement, the first task in any modelling project requires theis writingto ofwrite template (empty) GIS files (as demonstrated in [[Tutorial_Module01#Project_Initialisation|Tutorial Module 1]]). This page of the TUFLOW Wiki provides a reference list of the template (empty) GIS files, the associated TUFLOW command and a basic description of their function.<br>
==TUFLOW Control file (*.tcf)==
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