This linear baseline is located east of Grande Prairie, Alberta. The baseline piers are on the road allowance about 9 m west of the centerline. There are six piers made of 35 cm diameter pile pipe driven to a depth of 10.5 meters with tops projecting about 1.6 meters above ground level, and filled with concrete. A stainless steel plate, adapted for forced centering with a 1.59 cm threaded pin, is cemented into the top of each pier.
All piers are intervisible and accessible.
See Appendix A for a plan and profile view of this baseline. See Table 1 for the measurement history of the original and repaired baseline. The constant bias from the NGBL was used as a gross check on the value determined from the Grande Prairie baseline adjustment. The average scale bias from the two NGBL calibrations was applied to all distance observations. See Table 2 for the 1996 NGBL biases.