We do all of our construction site layout using electronic total stations and data collectors. We start by obtaining the site design in CAD format and then carefully checking it to be sure it was properly drawn. For example, we check that the 24 foot of pavement is drawn as 24.00 feet wide. Though most CAD drawings are drawn to the exact intended dimension, there are still enough "sloppy" CAD jobs that a good review is mandatory. After we are satisfied with the accuracy of the CAD file, we set data points at all points we will be staking in the field. These points are then exported from the drawing as ASCII data files and loaded into a data collector for the field survey. The surveyor, in essence, carries an exact duplicate of the site design with him to the job.
Example of ASCII data file:
166, 4620.2215507, 4722.5256079, 13.9871292,BB 14M
167, 4597.0454811, 4714.5379820, 12.1099278,BB 12
168, 4581.2187870, 4710.4521918, 11.3224765,CLP
169, 4577.5547370, 4713.6751077, 11.2079334,EHH
170, 4583.7863507, 4692.9768721, 12.3561393,UK 10
171, 4535.5585601, 4648.8439090, 11.6748825,UK 14M
172, 4466.2138478, 4600.8165372, 11.9317563,PP 20
173, 4449.2894038, 4594.7539219, 11.4632238,CLP
174, 4444.4629232, 4600.5753486, 10.6811584,EHH
175, 4776.1950586, 4872.8552016, 11.3326754,CHEADER
176, 4772.3635057, 4868.5403957, 11.2373555,CHEADER

Above is a comma-delimited ASCII data file in the format of Point No., North Coordinate, East Coordinate, Elevation, and Description Code

 

 

nickgun2.JPG (12407 bytes)

Workers put down new track on the Old Colony Railroad Project in Southeastern Massachusetts.

constr.jpg (29497 bytes)

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