End area volumes
This function applies the method of end areas to compute the volume of an excavation or a stockpile. End Area Volumes will take into account a natural surface and will optionally store the resultant sections into a string file for further processing, such as Split End Area Volumes or Stack Sections For Plotting.
To run this function: Choose Surfaces > Volumes > End area method, or...
Define first Surface
Enter the Location and ID number of the surface being sectioned, usually a pit or stockpile. You may also enter a range of strings that are to be used in the sectioning process.
Define second Surface
Enter the Location and ID number of the natural surface, to be used in the volume calculations. You may also enter a range of strings.
Define Boundary
Enter the Location and ID number of the boundary string file. This file can be obtained from either one of the above two files, or from the file defined here. You may also enter a range of strings.
Decimals to be displayed
Enter the number of decimal places that are to be used in the display of the results for this function. Complete the CALCULATE END AREA VOLUMES form and choose Apply to display the DEFINE RESULT FILE form.
Define the note file to be created
Enter the Location and ID number to define the note file which is to be created.
Complete the DEFINE RESULT FILE form and choose Apply to display the DEFINE AN AXIS LINE form.
The DEFINE AN AXIS LINE form defines the extent of the pit or stockpile in the direction of the axis. This form is only displayed if an axis is not already stored in the axis record of the first surface string file.
Note:It is usual surveying practice to store the axis line in the axis record of the string file. If no axis is present, you will be advised to enter a temporary axis. Remember, if your volume computation is ever subject to dispute, if you have stored the axis in the axis record of your string file, you have a permanent record.
Complete the DEFINE AN AXIS LINE form and choose Apply to display the END AREA SECTIONS RANGE AND OUTPUT form.
Extent of Data
Display only.
These coordinates indicate the extent of the data in the direction of the axis line.
Define Range of Sections
Enter the range of sections in ascending order along the axis.
For example, 6700,6900,5 means that you require sections every 5 meters from N6700 to N6900. If the axis is skewed, the range end of the axis is always at (0,0).
Define the output file for sections
Enter the Location and ID number of a string file in which the output sections can be stored.
Result
The results will be written to a '.not' file using the Location and ID number entered on the DEFINE RESULT FILE form. This file contains the details of the volume calculations on a section by section basis. A sample report is shown below.
-------------------------------------------------------------------------------- LOCATION : pit ID NUMBER 100. DATE OF SURVEY : 5-FEB-93 VOLUME MATERIAL: Join of PIT YA 6650.00 XA 2420.00 YB 7150.00 XB 2420.00 NATURAL SURFACE TAKEN FROM LOCATION : con ID NUMBER 100. -------------------------------------------------------------------------------- SECT WIDTH AREA CUM VOLUME | SECT WIDTH AREA CUM VOLUME 1 0.0 -476.9 0.0| 14 20.0 -9722.4 -2074128.4 2 20.0 -665.8 -11426.8| 15 20.0 -9607.8 -2267430.1 3 20.0 -2935.0 -47434.4| 16 20.0 -10233.1 -2465838.7 4 20.0 -6058.6 -137370.0| 17 20.0 -10645.1 -2674621.1 5 20.0 -7600.6 -273962.1| 18 20.0 -10804.2 -2889114.7 6 20.0 -9142.6 -441394.5| 19 20.0 -10829.5 -3105452.1 7 20.0 -10033.0 -633150.8| 20 20.0 -10676.8 -3320515.7 8 20.0 -10421.4 -837695.5| 21 20.0 -10132.0 -3528604.6 9 20.0 -10304.0 -1044949.9| 22 20.0 -9212.6 -3722050.7 10 20.0 -10535.1 -1253340.5| 23 20.0 -7147.9 -3885654.9 11 20.0 -10567.5 -1464366.3| 24 20.0 -3972.9 -3996862.5 12 20.0 -10272.5 -1672766.7| 25 20.0 -2139.2 -4057983.6 13 20.0 -10070.6 -1876198.2| 26 20.0 -383.8 -4083213.2 -------------------------------------------------------------------------------- COMPUTED ON 19-Feb-93 |
Note:If the first surface is the excavation and the second is the natural surface, the resulting volume will be negative. If the boundary string file contains anti-clockwise segments, End Area Volumes will only produce section lines and calculate volumes outside the boundary segment. A boundary string file can contain clockwise and anti-clockwise segments. Remember, segments can be reversed in STRING TOOLS or in GRAPHICS, this facility is useful to calculate `cut and fill' volumes.