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When the Projection Settings is selected, the Projection Settings form will appear as shown in Figure 4. As mentioned in the information box below, The user is not able to change the coordinate system from this form as Grid+ chooses the WGS84 geographic coordinate system as a default setting. It means that when we create any files from Grid+ and then export them to external files, their coordinates are in Latitude and Longitude. Figure 5 shows coordinates of a spline file when opening with the Notepad editor as an example. The first line of the file provides information on the coordinate system.
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As a By default setting, Grid+1.2 always works with the Geographic Coordinate System (GCS). It This means that its coordinates are longitude and latitude. |
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To do this, select the grid layer from the Layer Control panel, then Right-mouse click (RMC), select Properties as shown in 2479915036. After that Grid Settings form will appear. Select Coordinate System tab, as shown in 2479915036, and then click the Convert button. The form for the Coordinate System will pop up, as shown in 2479915036. 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, then click OK button. Next, click OK button in the form of 2479915036 to close it. Coordinate system conversion is now complete.
Anchor Figure 1 Figure 1
Figure 1 1. Access projection settings from a toolbar button.
Anchor Figure 2 Figure 2
Figure 2 2. Access projection settings from File menu.
Anchor Figure 3 Figure 3
Figure 3 3. Access projection settings from Tools menu.
Anchor Figure 4 Figure 4
Figure 4 4. Projection Settings form.
Anchor Figure 5 Figure 5
Figure 5 5. Open a generated file by Grid+ with the Notepad editor.
Anchor Figure 6 Figure 6
Figure 6 6. Select the Properties option of a layer in Layer Control (e.g., Grid layer).
Anchor Figure 7 Figure 7
Figure 7 7. Grid Settings: Coordinate System tab.
Anchor Figure 8 Figure 8
Figure 8 8. Convert Coordinate System.
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Anchor Figure 9 Figure 9
Figure 9 9. Export the Grid layer to an external file (1).
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Anchor Figure 10 Figure 10
Figure 10 10. Export the Grid layer to an external file (2).
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Anchor Figure 11 Figure 11
Figure 11 11. Exported grid in the northern hemisphere.
Anchor Figure 12 Figure 12
Figure 12 12. Exported grid in the southern hemisphere.
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When we import a grid that is not the native grid of Grid+ into Grid+ (this grid file does not have projection information in the file), for example, RGF grid (*.grd), we need to define projection for it by selecting right-mouse click on the grid layer in the Layer Control and then selecting Properties, the Grid Settings form will pop up. We select Coordinate System tab, click the Define button. Then, we should select the proper spatial reference, either geographic or UTM coordinate system. Then click the OK button to finish the projection defining step. Next, right-mouse click on that grid layer in the Layer Control, then select Zoom to Layer option, the grid will be located in the right place. |
Updating Overlay Files
In another case, when we open an overlay file generated by a CVLGrid such as *.P2D, or from third-party software, for example, a shoreline *.LDB (Delft3D LDB format), we will need to define the coordinate system..
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To correctly configure the shoreline location, we must define the correct projection (coordinate system) to the file. RMC on that layer and then select Properties option. The Overlay Properties form will pop up. Select the Coordinate System tab and click the Define button as shown in 2479915036 Figure 16. The Coordinate System form will appear, as shown in 2479915036 Figure 17, and we will select the correct projection from this form. The projection should be known by the user. 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 2479915036. Next, click OK button to close the form. The process for defining the coordinate system is completed. RMC on the shoreline layer and select Zoom to Layer, and it will be located in the correct location, as shown in 2479915036.
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Anchor Figure 13 Figure 13
Figure 13 13. Import third-party files with Grid+.
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Anchor Figure 14 Figure 14
Figure 14 14. Select the file to import.
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Anchor Figure 15 Figure 15
Figure 15 15. New shoreline layer added to Layer Control.
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Anchor Figure 16 Figure 16
Figure 16 16. Coordinate System: Define.
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Anchor Figure 17 Figure 17
Figure 17 17. Coordinate System: Define.
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Anchor Figure 18 Figure 18
Figure 18 18. Shoreline located in the correct place after defining a coordinate system.