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==Introduction== This page describes the method for using QGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers hav..."

2023-01-09T00:09:00Z

Created page with "<ol> ==Introduction== This page describes the method for using QGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers hav..."

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==Introduction==
This page describes the method for using QGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers have been setup, surface roughness or bed-resistance values (e.g. Manning’s n) are assigned to each of these land use areas via the materials.csv file created in [[Module1_test_Archive#Define_the_Materials_.28Surface_Roughness.29|Module 1]]. 

==Method==
<li>Copy the contents of the '''Module_data\Module_07\Materials''' into the '''TUFLOW\model\gis folder'''. This folder contains the following two layers: '''2d_mat_M07_DEV_001_R''' and '''2d_mat_M07_DEV_Buildings_001_R'''.
<li>Open both layers in QGIS. The '''2d_mat_M07_DEV_001_R''' layer contains polygons defining grassed areas and roads within the proposed development. The '''2d_mat_M07_DEV_Buildings_001_R''' layer contains polygons defining the buildings within the proposed development.
<li>The materials attribute for a number of polygons representing proposed roads in the '''2d_mat_M07_DEV_001_R''' 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. 
 
[[File:M07 mat roads QGIS.png]] 
 
All polygons within the '''2d_mat_M07_DEV_Buildings_001_R''' 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_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. 
 
[[File:M07 mat update QGIS.png|700px]] 
 
<li>Open the '''Materials.csv''' file created in Module 1 within the '''TUFLOW\model\''' folder to observe the Manning’s n values that will be assigned to each Material ID.
<li>Save both '''2d_mat_M07_DEV_001_R''' and '''2d_mat_M07_DEV_Buildings_001_R''' layers.

==Conclusion==
Two 2d_mat GIS layers have been created to define land use categories representing the proposed development. [[Tutorial_Module07_Archive#Define_Pipe_Network | Please return to the main page of module 7]].

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Tute M07 QGIS 2D MAT Archive - Revision history

ElizaCollison: Created page with " ==Introduction== This page describes the method for using QGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers hav..."

ElizaCollison: Created page with "
==Introduction== This page describes the method for using QGIS to create the GIS based material types (land use areas) for the proposed development. Once these layers hav..."