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After building a grid, it is necessary to modify and improve it. Clicking on the Grid menu in the main toolbar displays a number of options for this purposeGo to the Tools menu to access a tool to make a georeferenced map and general settings, as shown in 2126118913Tool Menu. The function of each option is described in the table below.

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Figure 1
Figure 1

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Figure 1 Grid Tools menu options.


OptionsDescription
Refine Grid
Image Georeferencing

This option allows the user to

increase the resolution of the grid. It operates by multiplying the existing number of cells in the current grid with I and J directions independently.Coarsen GridThis option operates in an opposite way to that for Refine Grid. It decreases the resolution of the grid.Orthogonalize GridThis option is used to reduce the orthogonal deviation of a grid.Merge Two GridsOften the model domain is too complex to create a single grid that accurately represents the area. Therefore, the user may have to create several grids and connect them using the Merge Two Grid tool.Delete Selected Grid BlockWhen a grid block is selected, using this option will delete grid nodes inside the block.Modify Indexing

This feature allows to change grid indices, including transpose I-J, flip I or J, and rotate I→J and J→I (2126118913).

Transpose I - J Indices

Flip I Indices

Flip J Indices

Rotate Indices Clockwise

Rotate Indices Counter-Clockwise

Show Grid Properties

This feature allows showing grid's properties as shown in 2126118913.

None

Orthogonal Deviation

Cell Area

Cell Aspect Ratio

Cell DX

Cell DY

Show Grid Labels

This feature allows showing grid's labels as shown in 2126118913.

None

Nodal I,J Indices

Cell I,J Indices

Cell L Indices

make a background georeferenced map (described in detail below).

Settings

General settings for Grid+

Image Georeferencing

Suppose that we define a region in Google Earth with two points (P1 and P2), as shown in Tool Menu. We will save the image to a file (with *.jpg extension format).

Go to the Tool menu from Grid+ GUI, select Image Georeference and then the Image GeoReference Tool form appears, click Add Images button and browse to the image, which was generated by Google Earth. Click the Clear Points to empty the Control Points frame (Tool Menu).


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Figure 2
Figure 2

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Figure 2 Modify Indexing optionsMake an image file with at least two points from Google Earth.

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Figure 3
Figure 3

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Figure 3 Show Grid Properties optionsAdd an image to the Image georeference tool.

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Figure 4
Figure 4
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Figure 4 Show Grid Labels options.