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 DTM Stakeout

 

1) When I try to import my 3DFACE triangles from a DXF file, the program reads all the lines, but finds no triangles. Why?

You need to enter the layer name that contains the 3DFACE triangles. This name should be 8 characters or less.

SECTION
  2
ENTITIES
  0
3DFACE
  5
2A
100
AcDbEntity
  8
TIN-EXCAVATION
100
AcDbFace
 10
563871.848622
 20
90361.209773
 30
2947.0

In the example above, the layer name is TIN-EXCAVATION.  This should be renamed to something with 8 characters or less. For example, TRIANGLE would be perfect. This matches the default layer name in the DTM stakeout routine.

This is where a job, the DTM file and a DXF layer may be selected.

 

Job - Press ENTER to open listbox (and create a new job) or use right/left arrow key to toggle between jobs.

DTM File - If only one DTM file is kept in the DTM folder on the PC card, it is selected automatically. With several files in the folder press ENTER to make a selection.

DXF Layer - For a DXF file, the layer in which the triangles for the DTM have been stored can be selected here. TRIANGLE is the default layer name setting. If your DXF file uses a different layer, overtype here. For files in Leica GSI format, this line is irrelevant.

 

2) A COGO example: Staking a well at some offset from two section lines.

The drilling company wants us to stake a drill location 2600' west of the east section line and 2500' north of the south section line. This is the only location criterion given.

The project has been scouted and the SW corner, the SE corner and the NE corner of the section have been found, and a good place for the base receiver has been located. Establish a base mark, setup the base receiver, enter the antenna height and do a 5-minute single point position which is stored as point BASE. The base receiver is now broadcasting.

Setup the rover receiver, making sure the units are set to feet (CONFIG key | General | Units). Next, you will want to get into a ground coordinate system. You will use the position of the base receiver to do this. Perform the steps in FAQ.SR530 #8 to create a ground scale coordinate system.

Now, start the survey and occupy the section corners and any other features or points of interest.

To create the well location coordinates for stakeout, we will use the COGO routines. Perform the following steps to create the well location:

1.      From the main menu select 3 Applications.

2.      Select 05 COGO.

3.      The job name will be that of the current job. If this is not the job that contains the section corners that have been located, select the correct job name.

4.      Specify whether or not you want a log file, and if you do, enter the file name.

5.      Set the Use offset field to YES.

6.      Set Use Brg to YES if you want to specify directions as bearings (0-90 east or west of north or south). If left at NO, you will enter directions as north azimuths (0-360 clockwise).

7.      Press <F1> CONT.

8.      Select 3 Intersection.

9.      Select 1 Bearing-Bearing

10.     For our example, set Point Id 1 to the SE section corner.

11.     With the <down-arrow> key, move the cursor to the bearing field and press <F2> INV.

12.     Enter the SE section corner in as Line Pt 1 and enter the NE section corner in as Line Pt 2.

13.     Press <F1> COMP and  the bearing from the SE corner to the NE corner will be entered in.

14.     Move down to the Parall OS field and enter -2600 ft. Note: The offset is to the left of the line so be sure to enter a negative offset.

15.     Set Point Id 2 to the SW corner.

16.     Move down to the bearing field and press <F2> INV.

17.     Enter the SW section corner in as Line Pt 1 and enter the SE section corner in as Line Pt 2.

18.     Press <F1> COMP and the bearing from the SW corner to the SE corner will be entered in.

19.     Move down to the Parall OS field (this field may not be visible, but will appear when you scroll down) and enter -2500 ft. Note: The offset is again to the left of the line so be sure to enter a negative offset.

20.     Press <F1> COMP.

21.     The displayed coordinates are the coordinates of the intersection, i.e., the well location.

22.     Enter in the name for the well location point.

23.     Press <F1> STORE to store this point and stake it out later, or Press <F5> STAKE to go immediately to the stakeout routine.

 

 

 

Copyright(c) 2003 Ellis R. Veatch II. All rights reserved.
ellisv@ellisv.com