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Figure 7: Access Project Settings.
Besides the Coordinate Projection tab, the Project Settings form has General, and Default Precisions. General tab allows setting unit system for the model. While The default Precisions tab allows the precision of parameters in the model to be set as shown in
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Figure 8: Project Settings: General tab.
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Figure 9: Project Settings: Default Precision tab.
Click on the Coordinate Projection section, and the currently applied or selected coordinate system is immediately presented in the window. As noted in the Warning: EFDC+ supports only Universal Transverse Mercator (UTM) and Geographic Projections. Any changes made will alter the projection of the model grid permanently, thus affecting multiple modelling functionalities.
To change the CS, click the Change button in the Projection Settings form.
The pop-up Coordinate System form (Figure 3) comprises the Specify a spatial reference section, which provides different CS options, and the Spatial Reference Information section, which details information of the currently selected CS. There are five reference coordinate systems as below:
- Geographic (Longitude/Latitude): Selecting this applies the World Geodetic System (WGS) 1984 to the project.
- UTM, Northern Hemisphere: Selecting this applies the Universal Transverse Mercator (UTM) - Northern Hemisphere projection. A drop-down menu will be enabled for specifying the specification of UTM Zone (from 1 to 60).
- UTM, Southern Hemisphere: Selecting this applies the UTM – - Southern Hemisphere projection. Similar to the UTM, Northern Hemisphere, users need to select an a UTM Zone for this CS in the second drop-down menu.
- User Defined: Besides the predefined WGS 1984 geographic coordinate system and UTM projection, users can define their own UTM projection or import/download any projection for the current layer. Choosing this option enables the Define, Import, and Download
- Define button: Defines projection by configuring the map projection parameters (Figure 4Setting the Coordinate System (EEMS12)). The parameters are characterized based on the UTM and WGS 84 systems.
- Import button: Defines projection by importing a CS coordinate system information from a *.prj file (Figure 5Setting the Coordinate System (EEMS12)).
- Download button: Defines projection by downloading CS coordinate system information with an EPSG Code (Figure 6 (Setting the Coordinate System (EEMS12)).
- No Projection: Selecting this means no Cartesian projection will be applied to the entire project.
With all CS options, the The Export button is always enabled, allowing allows users to retrieve projection details and save them in a *.prj file.
Once the desired projection is selected, click OK to apply changes to the project.
Figure 3: Coordinate System settings
Figure 4 Setting the Coordinate System (EEMS12) shows a dialog that allows defining a UTM projection with some specific parameters. The scale factor of 0.9996 is applied for the zone width of 6° of longitude, and the scale factor of 0.9999 is applied for the zone width of 3°. The central meridian indicates the central meridian longitude of the zone. The latitude of the original is usually taken as zero, and the false easting is usually taken as 500 000 meters. The false northing is taken the zero value for the Northern Hemisphere and is taken the value of 10 000 000 meters for the Southern Hemisphere.
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Anchor Figure 8 Figure 8
Figure 48: Define coordinate system with projection parameters based on UTM and WGS 84.
Anchor Figure 9 Figure 9
Figure 59: Define projection by importing a *.prj file
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Setting the Coordinate System (EEMS12) shows a dialog that allows users to download projection information from the Internet using an EPSG code. EPSG codes for different CSs coordinate systems can be found at https://epsg.io or https://spatialreference.org. The EPSG codes for the projection information for UTM zones have the form EPSG:326xx. For example, the EPSG code for UTM Zone 10 is EPSG:32610, so users can enter the value of 32610 into the search box to download its projection information.
Figure 610: Define projection using EPSG Code.
Besides the Coordinate Projection tab, the Project Settings form has General, and Default Precisions. General tab allows setting unit system for the model. While The default Precisions tab allows the precision of parameters in the model to be set, as shown in Figure 8 and Setting the Coordinate System (EEMS12).
Anchor Figure 12 Figure 12
Figure 11: Project Settings: General tab.
Anchor Figure 13 Figure 13
Figure 12: Project Settings: Default Precision tab.