Tute M01 Inspect Zpts SAGA - Revision history

tuflow>Par: Protected "Tute M01 Inspect Zpts SAGA": High traffic page ([edit=sysop] (indefinite) [move=sysop] (indefinite))

2011-09-29T01:34:29Z

Protected "Tute M01 Inspect Zpts SAGA": High traffic page ([edit=sysop] (indefinite) [move=sysop] (indefinite))

← Older revision		Revision as of 11:34, 29 September 2011
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tuflow>Par at 05:03, 25 August 2011

2011-08-25T05:03:52Z

← Older revision		Revision as of 15:03, 25 August 2011
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	* Shapes to '''2d_zpt_M01_5m_003_P'''		* Shapes to '''2d_zpt_M01_5m_003_P'''
	* Attribute to DEM_M01		* Attribute to DEM_M01
	* Expression to "a ~~< 0~~" (without the quotes)		* Expression to "eq(a,-99999)" (without the quotes)
	Select ''Okay''.		Select ''Okay''.
	[[File:Tute M01 Saga Select By Attribute.png\|frame\|none\|Select by Attribute]]		[[File:Tute M01 Saga Select By Attribute.png\|frame\|none\|Select by Attribute]]
	<li> Navigate to the ''Data'' tab in the ''Workspace'' window. The Zpts outside of the DEM should be highlighted. To delete these, right click on the '''2d_zpt_M01_5m_003_P''' item and select ''Edit >> Delete Selected Shapes''.</li>		<li> Navigate to the ''Data'' tab in the ''Workspace'' window. The Zpts outside of the DEM should be highlighted. To delete these, right click on the '''2d_zpt_M01_5m_003_P''' item and select ''Edit >> Delete Selected Shapes''. The map window should look like the below:</li>
	[[File:Tute M01 Saga Zpt NullRemoved.png\|frame\|none\|Map View with null Zpts Removed]]		[[File:Tute M01 Saga Zpt NullRemoved.png\|frame\|none\|Map View with null Zpts Removed]]
			TUFLOW requires the elevation data to be in the fourth column and the inspection has added a fifth column with the DEM values. There are two ways of overcoming this:

			* Updating the fourth (elevation) attribute column to have the values of the newly created (RASTERVALU) attribute.
			* Remove the elevation column, so that the RASTERVALU column becomes the fourth column.
			We will demonstrate the second option, the first option will results in the same data being stored twice in the shapefile, which will mean bigger file sizes.<br>
			<li>In the ''Data'' tab, right-click on the '''2d_zpt_M01_5m_003_P''' item and select ''Attributes >> Show''. This should bring up a tabular view of the data:</li>
			[[File:Tute M01 Saga Zpt Attributes1.png\|frame\|none\|2d_zpt_M01_5m_003 Attributes]]
			<li>Select the ''Delete Field'' icon (highlighted above)</li>
			<li>In the dialogue, check the elevation check box and select ''Okay''</li>
			[[File:Tute M01 Saga Zpt DeleteField.png\|frame\|none\|Delete Fields Dialogue]]
			<br>
			By deleting the Elevation field we have promoted the DEM_M01 field to the fourth position and will be used by TUFLOW. In the map window, if you select a point with the ''Action'' cursor and navigate to the ''Attributes'' tab in the ''Objects Properties'' window, the output should look like this:<br>
			[[File:Tute M01 Saga Zpt Fields3.png\|Attributes After Removal of Elevation Field]]
			<li>In the ''Data'' tab, right click on the '''2d_zpt_M01_5m_003_P''' item and select ''Save''</li>
			We have now updated the GIS layer, the next step is to modify the TUFLOW geometry control file to read the new shapefile.<br>
	<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>		<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>

tuflow>Par at 04:31, 25 August 2011

2011-08-25T04:31:04Z

@@ Line 23: / Line 23: @@
 <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.
 <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>

tuflow>Par at 03:01, 25 August 2011

2011-08-25T03:01:24Z

@@ Line 11: / Line 11: @@
 [[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>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>

tuflow>Par: Created page with '
=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...'

2011-08-25T02:16:12Z

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...'

New page

<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 open, and open the DEM, which is provided as part of the '''Module Data''' and is named '''DEM_M01.sgrd'''.

=Method=
<li>Open the blank Zpt layer '''2d_zpt_M01_5m_002_P.shp''', this was written in the '''TUFLOW\Model\saga\''' directory. The Zpts will appear as a mass of points when zoomed to the full extent.</li>
[[File:Tute M01 Saga Zpts All.png|frame|none|400px|All Zpts in SAGA GIS]]
<li>In the ''Workspace'' section of the interface (this can be toggled by using ''Window >> Show Workspace''), navigate to the ''Data'' tab (tab located at the bottom of the window). Right click on the '''2d_zpt_M01_5m_002_P.shp''' and select ''Save As''. Save a copy of the table as '''2d_zpt_M01_5m_003_P.shp'''. This is done for version control, we will edit the version 003 of the table as the input will be used in model run 003.</li>
<li>Open the newly created layer '''2d_zpt_M01_5m_003_P.shp''' and close the previous version '''2d_zpt_M01_5m_002_P.shp'''.</li>
<li>Ensure the ''Object Properties'' (''Windows >> Show Object Properties'') windows is visible, navigate to the Attributes tab. Select the ''Action'' cursor, and select a 2d_zpt. The attributes for the selected zpt will be shown, the SAGA window should look like the below:</li>
[[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. 

<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>

<li>Add the following lines to the TGC file and save.</li>
<tt>Set Zpts </tt> <tt>== 75</tt> 
<tt>Read RowCol Zpts </tt> <tt>== </tt> <tt>..\model\saga\2d_zpt_M01_5m_003_P.shp</tt> 
== Conclusion ==
The Zpts have been inspected from the DEM, the geometry control file (.tgc) updated to use the inspected Zpts. Please return to the tutorial model module 1 page where the next step is to [[Module1_test#Define_Preliminary_Active_and_Inactive_Areas_of_the_2D_Domain|define the active areas]].
</ol>

Tute M01 Inspect Zpts SAGA - Revision history

tuflow>Par: Protected "Tute M01 Inspect Zpts SAGA": High traffic page ([edit=sysop] (indefinite) [move=sysop] (indefinite))

tuflow>Par at 05:03, 25 August 2011

tuflow>Par at 04:31, 25 August 2011

tuflow>Par at 03:01, 25 August 2011

tuflow>Par: Created page with ' =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...'

tuflow>Par: Created page with '
=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...'