GMS:Converting 3D Grids to Other Data Types: Difference between revisions
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===Grid -> 3D Scatter Points=== | ===Grid -> 3D Scatter Points=== | ||
:The '''''Grid -> Scatter Points''''' command in the | :The '''''Grid -> Scatter Points''''' command in the ''Grid'' menu in the 3D Grid Module is used to create a new scatter point set using the nodes or cells of a 3D grid. A copy is made of each of the data sets associated with the grid and the data sets are associated with the new scatter point set. | ||
=== Grid -> 3D Mesh === | === Grid -> 3D Mesh === | ||
:A new 3D finite element mesh can be created from a 3D grid by selecting the '''''Grid -> Mesh''''' command from the | :A new 3D finite element mesh can be created from a 3D grid by selecting the '''''Grid -> Mesh''''' command from the ''Grid'' menu in the 3D Grid menu. An eight node quadrilateral element is created from each cell in the grid. | ||
=== Grid -> 2D Grid === | === Grid -> 2D Grid === | ||
:A new 2D grid can be created from a 3D grid by selecting the '''''Grid -> 2D Grid''''' command from the | :A new 2D grid can be created from a 3D grid by selecting the '''''Grid -> 2D Grid''''' command from the ''Grid'' menu in the 3D Grid module. This creates a 2D grid which matches the 3D grid, i.e., one cell is created in the 2D grid for each vertical (ij) column in the 3D grid. This command is typically used in conjunction with the '''''3D Data -> 2D Data''''' command. | ||
=== MODFLOW Layers -> 2D Scatter Points === | === MODFLOW Layers -> 2D Scatter Points === | ||
:The '''''MODFLOW Layers -> 2D Scatter Points''''' command in the | :The '''''MODFLOW Layers -> 2D Scatter Points''''' command in the ''Grid'' menu of the 3D Grid module is used for regional to local model conversion. It is only available if the true layer mode is being used with a MODFLOW model. When this command is selected, a new 2D scatter point set is created and a scatter point is created at the centroid of each vertical column of cells in the 3D grid. A data set is then created on the scatter point set for the top and bottom elevations of each layer and for the computed head values (if a MODFLOW solution is in memory). The MODFLOW head data set is chosen in the following way: If a modflow head data set is the active data set then GMS uses that data set for the starting heads. If the active data set is in a modflow solution but is not a head data set then GMS tries to use the head data set in the active solution. If neither of the first 2 cases works then GMS just goes through the list of data sets and uses the last modflow head data set that it finds (most likely the last solution that was read in). At a later point in time, these data sets can be interpolated from the scatter points to the cell centers of a smaller, local grid. | ||
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=== 3D Data -> 2D Data === | === 3D Data -> 2D Data === | ||
{{only in print|[[Image:Sample_water_table.GIF|left|frame|Watertable Elevations From a MODFLOW Simulation]] | {{only in print|[[Image:Sample_water_table.GIF|left|frame|Watertable Elevations From a MODFLOW Simulation]] | ||
The '''''3D Data -> 2D Data''''' command in the | The '''''3D Data -> 2D Data''''' command in the ''Data'' menu of the [[GMS:3D Grid Module|3D Grid module]] is used to create data sets on a 2D grid created using the [[GMS:3D Grid Module#Converting_3D_Grids_to_Other_Data_Types|Grid to 2D Grid]] command. These two commands are useful for creating a 2D representation of a 3D data set for contouring. | ||
The '''''3D Data -> 2D Data''''' command brings up the 3D Data Set -> 2D Data Set dialog. The button at the top of the dialog is used to select which 3D data set is to be converted to a 2D data set. The drop down box lists each of the options available for converting each column of 3D data values to a single 2D data value. The figure below shows an example of using the '''''3D Data -> 2D Data''''' command. | The '''''3D Data -> 2D Data''''' command brings up the 3D Data Set -> 2D Data Set dialog. The button at the top of the dialog is used to select which 3D data set is to be converted to a 2D data set. The drop down box lists each of the options available for converting each column of 3D data values to a single 2D data value. The figure below shows an example of using the '''''3D Data -> 2D Data''''' command. |