VrOne
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MANAGE DTMs (ManDtm)
Type: System Management
Allows user to manage DTM surfaces, and compute surface volumes.
Detailed Description
The DTM Manager dialog displays a list of the 8 possible DTM surfaces that may be used in VrOne. You can quickly set the active surface, change the parameters for a surface, or compute the DTM for a surface. If you have purchased the VrVolumes module, then the dialog also adds the ability to compute volumes between surfaces or between a surface and a flat plane.
DTM Manager Dialog
This is the full dialog with VrVolumes enabled. Only the left half of the dialog is displayed if VrVolumes is not available.
Each surface is represented by a row in the dialog box.
Surface List
Following is an explanation of each column in the surface list.
Active
Indicates if this surface is active. Only one surface may be active at a time. The user may select the radio button to make the surface active. The ADT command may be also be used to make a surface active.
Points
Displays the number of points making up this surface. Only displayed if the Run command has been used on this surface and free DTM was set to no.
Breaks
Displays the number of break lines making up this surface. Only displayed if the Run command has been used on this surface and free DTM was set to no.
Enter Params
Makes the surface active, and displays the parameters dialog box for this surface. Each surface can have it’s own unique set of parameters.
Run
Makes the surface active, and computes the DTM based on the parameters for this surface. This is the same as using the ADT command followed by RUNDTM.
Clear
Clears the surface. Removes the surface from memory, does not affect any surface data in the VrOne file.
Enter Params
Displays the parameters dialog box for this surface. Each surface maintains it’s own unique set of parameters. See the documentation for SetDtm for a full explanation of the DTM parameters.
Volumes
The volumes section of the dialog is displayed if you have purchased the VrVolumes module. VrVolumes provides cut and fill results using a prismoidal volume computation method. Volumes are calculated directly from the triangles of the surfaces.
To compute the volume between two surfaces, you must first define the surfaces by using the “Enter Params” button on two of the 8 available surfaces. Once the surface parameters have been defined (points and break line layers), you can set the Original and New DTM numbers to the appropriate surface numbers, then press the Compute button to start the volume computation process.
To compute the volume between a surface and a flat plane, you must have at least one surface defined in one the 8 available surfaces. Once the surface is defined, you can set the Original or New surface to the appropriate surface number, and the set the other surface to use the “Flat Elev”, and then press the Compute button to start the volume computation process.
When computing surface to surface volumes, only the overlapping area between the two surfaces is used in the volume computations. Because this overlapping area is not always well defined, it is recommended that you provide a specific boundary line for the area to be computed. You do this by using the “ID Boundary Line” button to select a boundary line before staring the volume computation. You must also turn on the “Use Boundary Line” option. This line does not need to be part of either surface, and does not need to have valid elevations. It will be integrated into each surface temporarily during the volume calculations.
During the volume computations, temporary surfaces are created that represent the merging of the two original surfaces and trimming to the boundary line area if one is specified. In order to verify and visualize the data used for volume computations, the boundary line and triangles from the merged surfaces can be saved in the VrOne file. The layers for saving this data are defined under the Output Options section.
After volume computations are complete, the results are displayed as raw Cut and Fill quantities below the compute button. These are displayed in the units of the VrOne file. For example, if you are working in feet, then the results will be cubic ft, and you would divide by 27 to get cubic yards.
Original DTM
Select the surface number that represents the original surface. If using a flat elevation for the original surface, then select “Flat Elev”, and enter the desired elevation in the adjacent text box.
New DTM
Select the surface number that represents the new surface. If using a flat elevation for the new surface, then select “Flat Elev”, and enter the desired elevation in the adjacent text box.
Use Boundary
If this is turned on, then the volume computation will be limited to an area defined by a closed boundary area. This area is defined by selecting a VrOne line using the “Id Boundary Line” button.
Id Boundary Line
Selecting this button allows you to pick an existing VrOne line to be used as the boundary of the volume computations.
Show Boundary Line
This is a tool that helps you identify if the correct boundary is being used for the computations. Clicking on this button will result in a white line being displayed I nthe VrOne graphics window representing the outline of the currently defined boundary area.
Delete Output Layers
If this is on, then all output layers will be deleted each time volumes are computed. The output layers are include the Original boundary line layer, New boundary line layer, Original Triangles layer, and New Triangles layer.
Output delta surface file
If a filename is specified, then the delta TIN is written to the specified surface file after the volume computations are complete. If the surface file already exists, it will be overwritten. This surface file can be used with the Quick Dtm command to generate contours, drape data, etc.
Original Surface Boundary Layer
The boundary line around the merged volume computation area at the elevation of the original surface will be placed in this layer. Set to 0 to disable.
New Surface Boundary Layer
The boundary line around the merged volume computation area at the elevation of the new surface will be placed in this layer. Set to 0 to disable.
Original Surface Triangles Layer
The triangles from the merged volume computation area at the elevation of the original surface will be placed in this layer. Set to 0 to disable.
New Surface Triangles Layer
The triangles from the merged volume computation area at the elevation of the new surface will be placed in this layer. Set to 0 to disable.
Report Settings Button
Press this button to set reporting options. The following dialog will be displayed.
Output to file
If this is checked, volume information will be written to a file.
Append to existing report file
If this is checked, and a report file is specified, volume information will be appended the report file if it already exists.
Output filename
This is the name of the output report file. Volume information is written in ASCII format to this file f the Output to file option is set.
Header text file
If a filename is specified, its’ contents will be added at the top of the report data. This must be a plaint text (ASCII) file.
Project name
The project name will be displayed at the top of the report.
Original Surface name
The original surface will be referred to by this name in the report.
New Surface name
The new surface will be referred to by this name in the report.
Volume units name
This postfix will be appended to the standard reported volumes.
Volume units scale factor
The standard volume amount will be multiplied by this number. For example, if a job is in feet, and the required reporting units are cubic yards, then a value
of 0.0370 could be used to convert from cubic feet to cubic yards.
Volume alternate units name
This postfix will be appended to the alternate reported volumes. If this is left blank, no alternate volumes will be reported. This is useful if the volume needs to be reported in more than one unit format.
Volume alternate units scale factor
The alternate volume amount will be multiplied by this number. For example, if a job is in feet, and the required reporting units are cubic yards, then a value
of 0.0370 could be used to convert from cubic feet to cubic yards.
Perimeter units name
This postfix will be appended to the standard reported perimeter.
Perimeter units scale factor
The standard perimeter amount will be multiplied by this number.
Perimeter
alternate units name
This postfix will be appended to the alternate reported perimeter. If this is left blank, no alternate perimeter will be reported. This is useful if the perimeter needs to be reported in more than one unit format.
Perimeter
alternate units scale factor
The alternate perimeter amount will be multiplied by this number.
Area
units name
This postfix will be appended to the standard reported area.
Area units scale factor
The standard area amount will be multiplied by this number.
Area
alternate units name
This postfix will be appended to the alternate reported area. If this is left blank, no alternate area will be reported. This is useful if the area needs to be reported in more than one unit format.
Area
alternate units scale factor
The alternate area amount will be multiplied by this number.
Decimal display digits
Specifies the number of digits to display to the right of the decimal point for all reported values.
Compute Button
Press this button to begin the volume computation process. When processing is complete the results will display beneath this button.