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FM Tute M02 QGIS 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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<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_R2d_mat_FMT_M02_DEV_Buildings_001_R.shp </b>.
<li>Open both layers in ArcGIS. The <b>2d_mat_ FMT_M02_DEV_001_R2d_mat_FMT_M02_DEV_001_R.shp</b> layer contains polygons defining grassed areas and roads within the proposed development. The <b>2d_mat_ FMT_M02_DEV_Buildings_001_R2d_mat_FMT_M02_DEV_Buildings_001_R.shp</b> layer contains polygons defining the buildings within the proposed development.
<li>The materials attribute for a number of polygons representing proposed roads in the <b>2d_mat_ FMT_M02_DEV_001_R2d_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 QGIS.png]]<br>
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All polygons within the <b>2d_mat_M07_DEV_Buildings_001_R2d_mat_FMT_M02_DEV_Buildings_001_R.sho</b> layer represent the buildings of the proposed development and will have the same Material ID of 3. Make use of the ‘Update All’ feature to automatically assign this value to all objects at the same time. Toggle Editing for the '''2d_mat_M07_DEV_Buildings_001_R2d_mat_FMT_M02_DEV_Buildings_001_R''' layer then right-click and select ''Open Attribute Table''. Type '3' in the blank field and select ''Update All'' as shown in the figure below. <br>
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[[File:M07 mat update QGIS.png|700px]]<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.</ol>
 
=Conclusions=
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