Page Comparison

The accuracy of a model is increased when the orthogonality of a grid is optimized. A perfect grid would have all cells perpendicular to the boundary lines. This is very difficult to achieve, and thus, for most EFDC models an orthogonality of under 3^o is recommended. The orthogonalization tool is used to reduce the orthogonal deviation of a grid.

To view the orthogonal deviation of a grid, LMC on the grid layer in the Layer Control then RMC on that grid layer to show RMC's options, select Show Properties/Orthogonal Deviation as shown in Figure 1. In addition, the orthogonal deviation of a grid can be viewed from the Grid menu as shown in Figure 2.

Anchor

	Figure 1
	Figure 1

Image RemovedImage Added

Figure 1 View orthogonal deviation of a grid from RMC's option.

Anchor

	Figure 2
	Figure 2

Image RemovedImage Added

Figure 2 View orthogonal deviation of a grid from Grid menu.

Anchor

	Figure 3
	Figure 3

Image RemovedImage Added

Figure 3 Orthogonal deviation of a grid.

...

Select the grid layer in the Layer Control by LMC
From Grid menu, select Orthogonalize Grid, or the user can click on the Orthogonalize grid button from the main toolbar as shown in Figure 4. As a result, the entire grid will be orthogonalized immediately. Figure 5 shows orthogonality change of the grid after applying Orthogonalize Grid

...

.

Anchor

	Figure 4
	Figure 4

Image RemovedImage Added

Figure 4 Orthogonalize grid.

Anchor

	Figure 5
	Figure 5

Image RemovedImage Added

Figure 5 Grid image after applying "Orthogonalize Grid"
anchorFigure 6Figure 6

Image Removed

Figure 6 Message informs the orthogonality reaches a limitation.

Othogonalize grid block

Select the grid layer in the Layer Control by LMC
From the main toolbar, select the Select object button then select a grid node, hold the Shift key and select the second grid node. The grid block will be highlighted as shown Figure 76.
Next, from Grid menu, select Orthogonalize Grid or the user can click on the Orthogonalize grid button from the main toolbar. In On the other hand, the user also can select Orthogonalize Grid Block from RMC's options as shown in Figure 87. As a result, the grid block will be orthogonalized immediately. Figure 98 shows orthogonality change of the grid after applying Orthogonalize Grid for a grid block.