The main toolbar in Grid+ provides all of the options most important for building and refining grid. The buttons from the main toolbar are shown in 2148499457 and their functions are described in the table belowThe feature of Create a rectangular grid is used to generate a structured grid with two dimensions. The Create a rectangular grid button in the main toolbar is shown as 2148073585.
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Figure 1 Main toolbar buttons.
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The Import button provides a number of options as shown in 2148499457. These options are described in the table below.
Import Grid: open different types of the grid file as native grid type of Grid+, RGF grid, ECOMSED grid, SEAGRID, etc.
Import EFDC Model: open the EFDC input file (e.g corners.inp, dxdy.inp, lxly.inp)
Import Georeferenced Image: open a georeferenced background image (e.g *.jgw, *.geo)
Import Overlay: open an overlay file as shoreline, polyline, polygon (*.p2d)
Import Splines: open the splines file (*.spl), this is a native file created from Grid+
Import Labels: open the label file (*.dat, *.p2d), this file has three columns. Two columns for coordinates (X, Y), and the third column is label names.
Import Cross-Sections: open the cross-section file (*.ldb, *.p2d), this file has three columns. Two columns are for coordinates (X, Y), and the third column is for elevation.
Import DEM: open the DEM (Digital Elevation Models) file (*.txt, *.asc, *.grd, *.tb2). DEMs are files that contain either points (vector) or pixels (raster), with each point or pixel having an elevation value.
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. Create a rectangular grid.
Once click that button, the Rectangular Grid form will pop up as shown in 2148073585.
- Min. Cell Size (m): the dimension of the grid cell in meters along the I and J direction
- Growth Factors: the expansion of the cell dimension in the I or J direction
- Number of Cells: the number of cells to generate a new grid
- UTM Zone: this is the Universal Transverse Mercator (UTM) zone number, from 1 to 60. After entering the location of the focal point, the UTM zone can be updated automatically
- Location of Focal Point: the longitude and latitude in degrees of the focal point in geographic coordinate system
- Rotation(deg.) : the angle in degrees to rotate the grid
2148073585 presents the generated rectangular grid generated. Selecting the grid layer in the layer control and holding the focal point is to move the grid cell. The corner point is used to rotate the grid. The side point is used to extend or narrow the grid cell along the side. 2148073585 shows the grid cell after extending, cells are added and have the same size as the previous cells.
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Figure 2 Import Menu.
The Export button provides a number of options as shown in 2148499457 . These options are described in the table below.
Export Grid: export the selected grid layer to the native grid file of Grid+ (*.gpc), CVLGrid (*.cvl), Delft3D (*.grd), and others.
Export to EFDC: export the selected grid layer to the EFDC input file (including corners.inp, dxdy.inp, lxly.inp), these files can open with EEMS.
Export to Shapefile: export the selected grid layer to the shapefile which can open with ArcGIS, QGIS, Global Mapper, and others.
Export to KML: export the selected grid layer to the KML file which can open with Google Earth, Global Mapper, and others.
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. Rectangular grid form.
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Figure 3. Rectangular grid.
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Figure 3 Export Menu4. Rectangular grid after extending.