GMS:Converting 3D Grids to Other Data Types: Difference between revisions

From XMS Wiki
Jump to navigationJump to search
No edit summary
Line 4: Line 4:
===Grid -> 3D Scatter Points===
===Grid -> 3D Scatter Points===


: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.
: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 '''''Grid''''' menu in the 3D Grid menu. An eight node quadrilateral element is created from each cell in the grid.
: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 '''''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.
: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 '''''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.
: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.




Line 39: Line 39:
=== 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 '''''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 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.

Revision as of 16:50, 17 November 2011

3D Grid Module
Samp mt3d.gif
3D Grid
Creating and Editing
Viewing Modes
Converting to Other Data Types
Exporting Grids
More
Display Options
Tool Palette
Cell Properties
MODFLOW Display Options
MODPATH Display Options
MT3DMS Display Options
3D Grid Commands

3D Grid data can be converted to other types of data in GMS such as 2D grids, 2D scatter points, 3D Meshes, or 3D scatter points. 3D Grid data is converted using the following commands in the Grid menu:

Grid -> 3D Scatter Points

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

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

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

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.



This dialog allows the user to create a scatter point set and data sets of the current MODFLOW simulation.
The user can limit the number of scatter points created by turning on the Only create scatter points within selected coverage option and selecting the appropriate coverage. This is often used when converting between a regional model and a local scale model.
  • Layer Subdivision
The layers of the current MODFLOW simulation can be subdivided by specifying the Number of local model layers for each layer in the current 3D grid.
The user can select which MODFLOW data sets to create by turning off/on the toggles below the Create data sets of text. Data sets for layer elevations, flow package data (HK, HANI, VK, SY, SS...), Recharge, and Heads can be created. The user must select a 3D grid data set in order to create a data set for the Heads (most often this will be the MODFLOW solution from the regional model).
The Recharge and Head data sets can be transient if the regional model was transient. The user can also select a Start and End time to limit the number of time steps for these data sets.
  • Bias Layer 1
An option to bias the thickness of the new layer 1 is also available. This can be useful if equally subdividing layer 1 of the regional model would result in cells where the elevation would be above the computed heads. Thus, the user can choose to bias the thickness of the new layer 1 to ensure that the top layer in the new model will not be dry.

3D Data -> 2D Data

The 3D Data -> 2D Data command in the Data menu of the 3D Grid module is used to create data sets on a 2D grid created using the 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.
:
File:Sample water table.GIF
Watertable Elevations From a MODFLOW Simulation