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| =Cartesian grid module=
| | #redirect [[SMS:Cartesian Grid Module]] |
| ==Overview==
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| The [[SMS:Cartesian Grid Module|2D Cartesian Grid Module]] contains tools used to construct 2D Cartesian finite difference grids. These grids consist of cells aligned with a rectilinear coordinate system.
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| Some models limit the grid to be defined with square cells, others limit to constant sized rectangular cells, while others add the flexibility of having variable sizes to the cells (variable row height or column width. It is used to create, edit, and visualize rectilinear grids. Datasets can have values at cells, corners, and midsides.
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| ==Functionalities==
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| The 2D Cartesian Grid Module contains tools used to construct 2D Cartesian finite difference grids. These grids consist of cells aligned with a rectilinear coordinate system.
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| Some models limit the grid to be defined with square cells, others limit to constant sized rectangular cells, while others add the flexibility of having variable sizes to the cells (variable row height or column width.
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| It is strongly recommended that grids be created through the [[SMS:Map Module|Map Module]]. The grid module currently includes interfaces for:
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| * [[SMS:BOUSS-2D|BOUSS-2D]] – phase resolving Boussinesq wave energy and circulation model
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| * [[SMS:CMS-Flow|CMS-Flow]] – hydrodynamic circulation specifically adapted for coastal zone
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| * [[SMS:CMS-Wave|CMS-Wave]] – wave energy model
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| * [[SMS:STWAVE|STWAVE]] – wave energy model
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| * [[SMS:TUFLOW|TUFLOW]] – Coastal, Riverine, and Urban hydrodynamic model with emphasis in flooding applications
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| ====Grid Types====
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| Types of 2D Grids Supported by models SMS. (a) Mesh-Centered Grid (b) Cell-Centered Grid.
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| In Cartesian grids, row and column boundaries are straight. Each cell center or grid node can have a unique elevation. The grid can also be rotated about the Z axis if desired.
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| [[File:GridType1.bmp|thumb|none|left|400 px|Types of 2D Grids Supported by SMS models: (a) Mesh-Centered Grid, (b) Cell-Centered Grid.]]
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| ====Creating and Editing 2D Grids====
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| '''Create Grid.''' A new grid can be created by selecting the '''Create Grid''' tool from the [[SMS:Cartesian Grid Tools|Cartesian Grid Tools]]. With this tool active, the user can create a grid by clicking on three points in the graphics window. The first click defines the origin of the grid, the second click defines the orientation of the grid and length of the I axis and the third click defines the length of the length of the J axis. Once the user clicks three times defining the three points, the [[SMS:Converting Feature Objects#Map to 2D Grid|Map → 2D]] dialog appears.
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| '''Editing 2D Grids.''' Each of the cells in a 2D grid can be active (water) or inactive (land). An inactive cell is ignored when contours or vectors are displayed on the grid and by the numeric engine during computation. If a cell has the potential of becoming active (due to wetting/drying or a similar process), it should be classified as active. Cells status is specified by selecting the cell and assigning a status through the model menu.
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| Rows and columns can be added to an existing grid that supports variable row/column size by using the '''Insert Row''', '''Insert Column''', '''Drag Row''', or '''Drag Column''' tool. (See [[SMS:Cartesian Grid Tools|2D Grid Tool Palette]])
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| ====Smoothing 2D Grids====
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| It may be useful to smooth the spatial data stored on a 2D grid for a number of reasons. These reasons include:
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| * In order to conserve the amount of disk spaced required to store a DEM, many DEM formats store elevations rounded to the nearest integer value. This causes elevation changes to occur in discrete steps rather than smoothly, as would be the case in nature. In regions of low relief, rounded elevations can cause an area to be artificially "flat."
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| *Surveys may include anomalies. Smoothing algorithms blend these bad data points into the surrounding values.
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| *Datasets may include spurious noise either from physical conditions such as waves or numerical filtering. Smoothing can dampen these variations.
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| When you right click on the grid in the Project Explorer, operations for the grid appear in a pop up window. One of these is the [[SMS:Grid Smoothing|smooth]] operation.
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| ====Converting 2D Grids====
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| 2D Grids may be converted to other types of data used in SMS, such as a [[SMS:Scatter Module|Scattered dataset]] of [[SMS:Mesh Module|2D mesh]]. 2D Grids can be converted by right clicking on the grid in the Project Explorer.
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| ==Project Explorer==
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| ====Cartesian Grid Module Root Folder Right Click Menus ====
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| Right clicking on the Cartesian Grid module root folder in the project explorer invokes an options menu with the following options:
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| * [[SMS:Display Options|Display Options]]
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| ====Cartesian Grid Item Right Click Menus ====
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| Right clicking on a Cartesian Grid item in the [[SMS:Project Explorer|Project Explorer]] invokes an options menu with the following module specific options:
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| * Smooth – Opens the [[SMS:Grid Smoothing|Cartesian Grid Smoothing Options Dialog]].
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| ====Model Specific Right Click Menus====
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| {|class="wikitable"
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| |-
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| !Command
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| !Description
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| !Applicable Models
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| |-
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| |Create Transformed Grid
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| |Opens the Create Transformed Grid dialog. Creates a copy of the grid with a rotated origin. Used to change the I direction for wave models.
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| | [[SMS:CMS-Wave|CMS-Wave]], [[SMS:STWAVE|STWAVE]]
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| |}
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| ==Menus==
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| The Cartesian Grid Module ''Data'' Menu commands include:
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| ====Model Specific Menus====
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| * [[SMS:BOUSS-2D Menu|BOUSS-2D ]]
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| * [[SMS:CMS-Flow Menu|CMS-Flow ]]
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| * [[SMS:CMS-WAVE Menu|CMS-Wave ]]
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| * [[SMS:STWAVE Menu|STWAVE ]]
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| * [[SMS:TUFLOW|TUFLOW ]]
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| ====Model Commands ====
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| * [[SMS:Steering|Steering Module ]]
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| * [[SMS:Cartesian Grid Module|Switch Current Model ]]
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| ====Dataset Commands ====
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| * [[SMS:Data Calculator|Data Calculator ]]
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| * [[SMS:Dataset Toolbox|Dataset Toolbox ]]
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| * [[SMS:Create Datasets|Create Datasets ]]
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| * [[SMS:Map Elevation|Map Elevation ]]
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| * [[SMS:Zonal Classification|Zonal Classification ]]
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| ====Visualization Commands / Options====
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| * [[SMS:Contour Options|Contour Options ]]
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| * [[SMS:Vector Display Options|Vector Options ]]
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| * [[SMS:Animations|Film Loop ]]
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| ====Data Conversion Commands====
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| * Grid → Scatterpoint
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| * [[SMS:Mesh to Map|Grid → Map ]]
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| * Grid → Mesh
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| ====Grid Commands====
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| * [[SMS:Cartesian Grid Find Cell|Find Cell]]
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| ==How do I?==
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| To learn more about how to use the Cartesian Grid Module go to the Tutorials section.
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| ==Cartesian Grid Tools==
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| The following tools are contained in the Dynamic Tools portion of the tool palette when the Cartesian Grid module is active. Tools specific to a model interface are described with the corresponding model. Only one tool is active at any given time. The action that takes place when the user clicks in the Graphics Window depends on the current tool. The following table describes the tools in the Cartesian Grid module tool palette. Depending on the current model, and the type of grids it supports, some of these tools may not be available.
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| {|class="wikitable"
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| |-
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| !Tool
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| !Tool Name
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| !Description
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| !Right Click Menu
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| |[[File:SMS_CGrid_Select_Cell_Tool_Icon.bmp]]
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| |Select Cell
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| |The Select Cell tool is used to select a grid cell. A single cell is selected by clicking on it. A second cell can be added to the selection list by holding the ''SHIFT'' key while selecting it. Multiple cells can be selected at once by dragging a box around them. A selected cell can be de-selected by holding the ''SHIFT'' key as it is clicked.
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| When a single cell is selected, its Z coordinate is shown in the [[SMS:Edit Window|Edit Window]]. The Z coordinates can be changed by typing in the edit field, which updates the depth function. If multiple cells are selected, the Z Coordinate field in the [[SMS:Edit Window|Edit Window]] shows the average depth of all selected cells. If this value is changed, the new value will be assigned to all selected points.
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| With one cell selected, the [[SMS:Edit Window|Edit Window]] shows the point i,j location. With multiple cells selected, the [[SMS:Edit Window|Edit Window]] shows the number of selected cells. The number and size of the cells can be changed in the Model Control.
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| |When one or more Cartesian grid cells are selected, and there is a scatter set in the project, a right-click in the graphic window will bring up a menu. One of the options is "Interpolate Bathymetry...". This option brings up the Interpolation dialog where the desired source scatter dataset can be selected. When OK is clicked, SMS will interpolate the selected cell(s)' elevations based on the chosen scatter dataset.
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| |[[File:SMS_CGrid_Select_Row_Tool_Icon.bmp]]
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| |Select Row
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| |The Select Row tool is used to select cell rows. Rows are selected in the same manner as selecting individual cells.
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| |N/A
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| |-
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| |[[File:SMS_CGrid_Select_Column_Tool_Icon.bmp]]
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| |Select Column
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| |The Select Column tool is used to select cell columns. Columns are selected in the same manner as selecting individual cells.
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| |N/A
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| |-
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| |[[File:SMS_CGrid_Split_Grid_Column_Tool_Icon.bmp]]
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| |Split Grid Column
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| |Insert a new column into an existing grid. This tool splits an existing column into two columns at the location selected by the user.
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| |N/A
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| |[[File:SMS_CGrid_Split_Grid_Row_Tool_Icon.bmp]]
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| |Split Grid Row
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| |Insert a new row into an existing grid. This tool splits an existing row into two rows at the location selected by the user.
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| |N/A
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| |[[File:SMS_CGrid_Drag_Column_Boundary_Tool_Icon.bmp]]
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| |Drag Column Boundary
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| |Edit column boundary. This tool makes one column narrower while making its neighbor wider.
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| |N/A
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| |[[File:SMS_CGrid_Drag_Row_Boundary_Tool_Icon.bmp]]
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| |Drag Row Boundary
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| |Edit row boundary. This tool makes one row taller while making its neighbor shorter.
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| |N/A
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| |[[File:SMS_CGrid_Select_Cell_String_Tool_Icon.bmp]]
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| |Select Cell String
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| |Select a “Cell String”. Allows assignment of boundary conditions.
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| |N/A
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| |[[File:SMS_CGrid_Select_Cell_String_Tool_Icon.bmp]]
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| |Create Cell String
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| |Create a “Cell String”. This tools allows the user to define a string of cells for later assignment of boundary conditions or flux observations.
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| |N/A
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| |}
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| ==Related Coverages==
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| The grid module currently includes interfaces for:
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| * [[SMS:BOUSS-2D|BOUSS-2D]] – phase resolving Boussinesq wave energy and circulation model
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| * [[SMS:CMS-Flow|CMS-Flow]] – hydrodynamic circulation specifically adapted for coastal zone
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| * [[SMS:CMS-Wave|CMS-Wave]] – wave energy model
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| * [[SMS:STWAVE|STWAVE]] – wave energy model
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| * [[SMS:TUFLOW|TUFLOW]] – Coastal, Riverine, and Urban hydrodynamic model with emphasis in flooding applications
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| {{Template:Navbox SMS}}
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