Difference between revisions of "Tutorial M04 Check Files QGIS GPKG"
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= Introduction = | = Introduction = | ||
QGIS is used to import the check files and review the topographic modification cutting through the embankment, and the layered flow constriction. <br> | QGIS is used to import the check files and review the topographic modification cutting through the embankment, and the layered flow constriction. <br> | ||
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Review the check files: | Review the check files: | ||
<ol> | <ol> | ||
| + | <li>Open the files, either: | ||
| + | :*Within the QGIS Browser Panel, navigate to '''Module_04\TUFLOW\check\M04_5m_001_Check.gpkg''' and double click the following layers, or | ||
| + | ::*'''M04_5m_001_zsh_zpt_check_P''' | ||
| + | ::*'''M04_5m_001_lfcsh_uvpt_check_P''' | ||
| + | :*In File Explorer, navigate to the '''Module_04\TUFLOW\check''' folder, drag and drop the '''M04_5m_001_Check.gpkg''' into the QGIS workspace and select the layers above (hold Ctrl to select multiple). | ||
<li>Navigate to the '''Module_04\TUFLOW\check''' folder and open the '''M04_5m_001_DEM_Z.tif''' layer into QGIS. | <li>Navigate to the '''Module_04\TUFLOW\check''' folder and open the '''M04_5m_001_DEM_Z.tif''' layer into QGIS. | ||
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<li>Use the 'Apply TUFLOW Styles to Open Layers'. | <li>Use the 'Apply TUFLOW Styles to Open Layers'. | ||
<li>Use the 'Apply GPKG Layer Names'. | <li>Use the 'Apply GPKG Layer Names'. | ||
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<li>The zsh_zpt_check file displays the elevation points changed by Z shape topographic update and the TUFLOW styling provides an indication of the elevation difference.<br> | <li>The zsh_zpt_check file displays the elevation points changed by Z shape topographic update and the TUFLOW styling provides an indication of the elevation difference.<br> | ||
<br> | <br> | ||
| − | + | {{Video|name=Animation_M04_GPKG_Check_01.mp4|width=1280}}<br> | |
<br> | <br> | ||
<li>The lfcsh_uvpt_check file shows the Zpts where the 2d_lfcsh is applied as a thin line. Only the cell sides have the flow constriction applied. The attribute table shows the values specified in the 2d_lfcsh and the final elevation of the invert level after applying the Z shape. <br> | <li>The lfcsh_uvpt_check file shows the Zpts where the 2d_lfcsh is applied as a thin line. Only the cell sides have the flow constriction applied. The attribute table shows the values specified in the 2d_lfcsh and the final elevation of the invert level after applying the Z shape. <br> | ||
<br> | <br> | ||
| − | + | {{Video|name=Animation_M04_GPKG_Check_02.mp4|width=1280}} | |
</ol> | </ol> | ||
<br> | <br> | ||
Latest revision as of 12:38, 14 August 2023
Introduction
QGIS is used to import the check files and review the topographic modification cutting through the embankment, and the layered flow constriction.
Method
This tutorial introduces:
Review the check files:
- Open the files, either:
- Within the QGIS Browser Panel, navigate to Module_04\TUFLOW\check\M04_5m_001_Check.gpkg and double click the following layers, or
- M04_5m_001_zsh_zpt_check_P
- M04_5m_001_lfcsh_uvpt_check_P
- In File Explorer, navigate to the Module_04\TUFLOW\check folder, drag and drop the M04_5m_001_Check.gpkg into the QGIS workspace and select the layers above (hold Ctrl to select multiple).
- Navigate to the Module_04\TUFLOW\check folder and open the M04_5m_001_DEM_Z.tif layer into QGIS.
- Use the 'Apply TUFLOW Styles to Open Layers'.
- Use the 'Apply GPKG Layer Names'.
- The DEM_Z grid shows the final elevations used for the model calculations. Change the styling and inspect the area of the embankment is lowered. See Module 2 for more information on how to review topographic modifications. Note: The DEM_Z appears different to the input DEM as the resolution of the DEM_Z is coarser (2.5m) than the input file (0.5m).
- The zsh_zpt_check file displays the elevation points changed by Z shape topographic update and the TUFLOW styling provides an indication of the elevation difference.
- The lfcsh_uvpt_check file shows the Zpts where the 2d_lfcsh is applied as a thin line. Only the cell sides have the flow constriction applied. The attribute table shows the values specified in the 2d_lfcsh and the final elevation of the invert level after applying the Z shape.
Conclusion
- The DEM_Z and zsh_zpt_check file was used to ensure the cut through was correctly applied to allow flow through the embankment.
- The lfcsh_uvpt_check was viewed showing the form losses and blockages applied to the thin line.
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