Compute Volume between two Surfaces

(This functionality is available with the Volumes module)

Computes the volumes of cut and fill between two model surfaces, and allows the generation of a new height difference model. Note that this command is block sensitive.

Surface to Surface Volumes dialog box

Item	Used to
Region Size:	Select a region size which will be used in the process to index the data into a number of regions.
Data Sets
From:	Display the name of the currently open database.
Model name:	Select the number of the model in the current database to be used as the 'From' model. Models may be created for any particular database using the Terrain Modelling/Modelling/Form Model command. Any previously created model may be displayed using the Display/Features command. Note: The 'From' model is considered to be the original surface which will be (or has been) cut and/or filled to achieve the 'To' surface.
To:	Display the name of the database from which the 'To' model is to be selected. This may be the currently open database or any other database. Use the Select button to change the selected database.
Browse	Open the dialog box to select the 'To' database to be used in the comparison.
Model name:	Select the number of the model in the 'To' database to be used as the 'To' model. The model Description will be shown in a static field next to the Model No. Note: The 'To' model is considered to be the finished surface after cut and/or fill has been (or will be) applied to the 'From' surface.
Common Data
Code Table:	Select the code table to be used for setting the attributes of the common data.
Save No Cut / No Fill Lines:	Select whether the lines of no cut / no fill are to be saved. These are the lines computed at the intersection of the 'From' and 'To' models.
Define (No Cut / No Fill Lines):	Assign feature codes to the points and lines computed at the intersection of the models; and to select whether these points and lines are saved to the 'From' data set, the 'To' data set, or both data sets. Refer to the No Cut / No Fill Codes dialog box.
Save Common Boundary Lines:	Select whether the common boundary lines are to be saved. These are line strings computed at the edge of the areas common to each of the 'From' and 'To' models. They define the extent of overlap between the two models.
Define (Common Boundary Lines):	Assign feature codes to the points and lines computed at the common area boundary of the models, and to select whether these points and lines are saved to the 'From' data set, the 'To' data set, or both data sets. Refer to the Boundary line Codes dialog box.
Save Height Difference Data Set:	Select whether the height difference data set is to be saved. The height difference data set forms a new database and consists of every point and line in the common area of the 'From' and 'To' models, as well as the points and lines computed at the intersection of the models and the common boundary. The computed elevation of each point in the new database is the height difference between the 'From' and 'To' models at that point.
Define (Height Difference Data Set):	name the new Height Difference database, and assign feature codes to the points and lines included in this database. Refer to the Create Height Difference Database dialog box.
Define (Height Difference Data Set):	name the new Height Difference database, and assign feature codes to the points and lines included in this database. Refer to the Create Height Difference Database dialog box.
Output results
Screen:	Output the computed volumes to the computer screen.
Printer:	Output the computed volumes to a printer.
File:	Output the computed volumes to a text file.
Header:	Toggle the option to output header information with the volume report.
Browse	Open the dialog box that is used to select the location of the volume report. The name of the volume report can be entered in the edit field next to the Browse button.
Compute	Perform the comparison between the 'From' and 'To' models, produce the output results and if requested create the height difference model. Refer to the Surface to Surface Volume Results dialog box.
Cancel	Close the dialog box without comparing the models.

NOTE: The height difference database may be opened and separately modelled as a quality control check on the results in the comparison report. After forming a model from the height difference database, compute the volume to a datum elevation of zero. The Cut and Fill results may then be compared to the results of the comparison between the 'From' and 'To' models. The results will of course not be exactly the same, as they are from a new model with a different triangle structure;