Tute M01 Inspect Zpts SAGA: Difference between revisions
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Created page with '<ol> =Introduction= In this page we look at the process on assigning elevations to the TUFLOW Zpts that define the elevations in the model using SAGA GIS. Ensure that SAGA is ope...' |
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[[File:Tute M01 Saga Zpts All2.png|frame|none|400px|All Zpts in SAGA GIS, with attributes selected]]
As can be seen the elevation for all zpts is a nuyll value of 99,999. The next step is to assign values based on the DEM.<br>
<li>Navigate to the ''Modules'' tab in the ''Workspace Window'', expand the ''Shapes - Grid'' entry and right click on the ''Add Grid Values to Points'' and select ''Execute''.</li>
[[File:Tute M01 Saga Modules Shapes Grid.png|frame|none|Shape-Grid Module: Add Grid Values to Points]]
<li></li>In the ''Add Grid Values to Points'' dialogue, set:
* Points to '''2d_zpt_M01_5m_003_P'''
* Result to '''2d_zpt_M01_5m_003_P'''
* Grids to '''DEM_M01'''
Select ''Okay''. See the image below.</li>
[[File:Tute M01 Saga Add Grid Val to Pts.png|frame|none|Add Grid Values to Points Dialogue]]
In the map window, if you select a point with the ''Action'' cursor and navigate to the ''Attributes'' tab in the ''Objects Properties'' window, a new data attribute '''DEM_M01'''. This field should have an elevation assigned:<br>
[[File:Tute M01 Saga Zpt Fields2.png|frame|none|Attributes after DEM value added to points]]
<br>
If you select a Zpt outside the DEM area the value that has been assigned to this attribute is -99,999. We will remove any Zpts that have this elevation.
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<li>Save the current TGC file as '''M01_5m_003.tgc'''. Comment out or delete the Write MI and Stop lines entered previously (these are no longer needed).</li>
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