Tute M03 QGIS 2d zsh Archive: Difference between revisions

Content deleted Content added
Created page with "<ol> =Introduction= In this page, we import data from text file format into a QGIS file. Once the data is in QGIS format we will manipulate into a TUFLOW 2d Z Shape (2d_zsh) f..."
 
No edit summary
 
Line 31:
[[File:Tute M01 QGIS projection2.png | frame | none ]]
<br>
The 2d Z Shape (2d_zsh) format requires the input data to be in the format outlined in Tablethe 4<u>[https://docs.8 of the 2010tuflow.com/classic-hpc/manual/latest/ TUFLOW manualManual]</u>. The first four columns of the table should contain the following attributes:<br>
* Z
* dZ
Line 98:
|}
As per the creek line above, the elevations are associated with the points and a dummy value of 99 is used on the line (the actual value is unimportant). If no points are in the layer, the elevation on the line object is used, i.e. the elevation along the line does not vary.<br>
As explained in Tablethe 4<u>[https://docs.8 of the 2010tuflow.com/classic-hpc/manual/latest/ TUFLOW manualManual]</u>, for a line object the Shape_Width_or_dMax, controls the width of the breakline in metres. Depending on the cell size the following methods of application are used:<br>
* Shape_Width_or_dMax = 0 - a "thin" breakline is used, only elevations on the cell side are modified (no change in storage);
* Shape_Width_or_dMax less than or equal to 1.5 times the cell size - a line of whole cells are modified (a "thick" breakline); or