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FM Tute M02 ARC Define Roughness: Difference between revisions

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Created page with "=Introduction= This page describes the method for using ArcGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers have be..."
 
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=Method=
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1. <li>Copy the contents of the <b>FMT_tutorial\Module_data\Module_02\Materials</b> into the <b>TUFLOW\model\gis folder</b>. This folder contains the following two layers:
*<b>2d_mat_FMT_M02_DEV_001_R.shp</b>, and
*<b>2d_mat_ FMT_M02_DEV_Buildings_001_R.shp </b>.
2. <li>Open both layers in ArcGIS. The 2d_mat_ FMT_M02_DEV_001_R layer contains polygons defining grassed areas and roads within the proposed development. The <b>2d_mat_ FMT_M02_DEV_Buildings_001_R.shp</b> layer contains polygons defining the buildings within the proposed development.
3. <li>The materials attribute for a number of polygons representing proposed roads in the <b>2d_mat_ FMT_M02_DEV_001_R.shp</b> layer have not been assigned and will need to be populated. Assign a Material ID of 2 to these polygons as shown in the figure below. Leave the remaining larger polygon with a Material ID of 1.<br>
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[[File:M07 mat roads ARC.png]]<br>
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All polygons within the 2d_mat_ FMT_M02_DEV_Buildings_001_R layer represent the buildings of the proposed development and will have the same Material ID of 3. To update the 'Material' field from 0 to 3, open the 'Calculate Field' toolset and populate the dialogue box as shown in the figure below.<br>
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[[File:M07 mat update ARC.png|600px]]<br>
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<li>Open the Materials.csv file within the <b>TUFLOW\model\</b> folder to observe the Manning’s n values that will be assigned to each Material ID.
 
=Conclusions=
 
Two 2d_mat GIS layers have been created to define land use categories representing the proposed development. Please return to the main page of the [[Flood_Modeller_Tutorial_Module02#Define Pipe Network|Flood Modeller Module 2 Tutorial]]
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