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Figure 1 Access projection settings from a toolbar button.
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Figure 2 Access projection settings from File menu.
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Figure 3 Access projection settings from Tools menu.
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Figure 4 Projection Settings form.
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Figure 5 Projection Settings formOpen a generated file by Grid+ with the Notepad editor.
The projection settings cannot be changed. However, Grid+ allows the user to convert from the geographic coordinate system for each file layer in the Layer Control panel to the Universal Transverse Mercator (UTM). The user must define the correct UTM zone number for the latitude and longitude location. For example, we make a grid by using Grid+ for the Caloosahatchee River in Florida, USA. As we define, this river is located in the northern hemisphere UTM zone 17. We now want to convert the grid from the geographic coordinate system to the UTM zone.
To do this, select the grid layer from the Layer Control panel, then Right-mouse click (RMC), select Properties as shown in Working with projection in Grid+. After that Grid Settings form will appear, select Coordinate System tab, as shown in Working with projection in Grid+, and then click the Convert button, the form of Coordinate System will pop up as shown in Working with projection in Grid+. Now, we need to define the correct target coordinate system to which we want to convert. In this case, we select UTM zone 17 in the northern hemisphere and then click OK button. Next, click OK button in the form of Working with projection in Grid+ to close it. At this stage, coordinate system conversion is done.
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Figure 6 Select the Properties option of a layer in Layer Control (e.g., Grid layer).
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Figure 7 Grid Settings: Coordinate System tab.
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In another case, when we open a file which is not generated by Grid+then click the Convert buttonWhen we import external files such as grid, spline, and overlay files, the coordinates in these files are already in Latitude and Longitude so that they will be generated by a third party, for example, a shoreline *.LDB (Delft3D LDB format), do we need to define a coordinate system? The answer is yes.
In this case, we consider the shoreline as an overlay file so that we will click the Import button from the Toolbar, then select Import Overlay as shown in Working with projection in Grid+. The Import Overlay Layer form will pop up, select the file and click Open button, as shown in Working with projection in Grid+. As a result, a new shoreline layer is added to the Layer Control panel, as shown in Working with projection in Grid+. However, it is not located in a place as we expected when we RMC on that layer and select Zoom to Layer option because the file does not contain the coordinate system information, so Grid+ does not know. So, how do we make the shoreline located in the right places in the online background map?
To do that, we need to define the correct projection (coordinate system) to the file by RMC on that layer and then select Properties option, Overlay Properties form will pop up, select the Coordinate System tab and click Define button as shown in Working with projection in Grid+. The Coordinate System the form will appear, as shown in Working with projection in Grid+, and we will select the correct projection from this form. The projection is supposed to be what we already know. In this case, we select UTM zone 17, northern hemisphere. After that, click OK button, this form will close and go back to the form in Working with projection in Grid+. Next, click OK button to close the form. At this stage, the process of defining the coordinate system is completed. RMC on the shoreline layer and select Zoom to Layer, it will be located in the correct place, as shown in Working with projection in Grid+.
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Figure 13 Import third-party files with Grid+.
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Figure 14 Select the file to import.
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Figure 15 New shoreline layer added to Layer Control.
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Figure 16 Coordinate System: Define.
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Figure 17 Coordinate System: Define.
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Figure 18 Shoreline located in the correct place after defining a coordinate system.