Pile Metrics Guide

This guide outlines the various metrics used in our system, grouped into four main categories. Each section includes a description of the metrics along with a corresponding illustration.

1. Design Metrics

These metrics represent the planned or target values during the design phase.

• Design N (local distance unit):
• The planned northward coordinate measured in the designated unit (e.g., meters or feet).

• Design E (local distance unit):
• The planned eastward coordinate in the chosen unit of distance.

• Design Z (local distance unit):
• The planned elevation (vertical coordinate) using the designated unit.

• Design Azimuth:
• The planned directional angle relative to true north.

• Design Dip:
• The planned angle of slope (inclination) for the design.

Illustration:

2. Actual Metrics

These metrics capture data recorded by the machine during the operation process.

• Machine:
• Identifier or name of the machine used for the operation.

• Start Date Time:
• The exact timestamp when the hammer penetration begins.

• Start Date:
• The date extracted from the start timestamp.

• Start Time:
• The time extracted from the start timestamp.

• Stop Date Time:
• The timestamp indicating when the Pile Driver drives off the pile at a 1 ft tolerance.

• Stop Date:
• The date portion of the stop timestamp.

• Stop Time:
• The time portion of the stop timestamp.

• Duration:
• The total time elapsed between the start and stop of the operation.

• Start N (local distance unit):
• The north coordinate at the beginning of the operation.

• Start E (local distance unit):
• The east coordinate at the beginning of the operation.

• Start Z (local distance unit):
• The elevation coordinate at the start.

• Azimuth:
• The machine’s measured azimuth during the operation.

• Dip:
• The machine’s measured dip (slope) during the operation.

• End N (local distance unit):
• The north coordinate at the end of the operation.

• End E (local distance unit):
• The east coordinate at the end of the operation.

• End Z (local distance unit):
• The elevation coordinate at the end.

3. Survey Metrics

These metrics document the actual measurements obtained during the survey process.

• Survey Machine:
• Identifier of the machine used for surveying.

• Survey Date Time:
• The timestamp when the survey was conducted.

• Survey N (local distance unit):
• The measured north coordinate from the survey.

• Survey E (local distance unit):
• The measured east coordinate from the survey.

• Survey Z (local distance unit):
• The measured elevation coordinate from the survey.

4. Error Metrics

These metrics quantify discrepancies between the design, machine, and survey measurements, helping to identify and correct deviations.

• N Error (local distance unit):
• The error in the north coordinate (difference between expected and measured).

• Forward/Back Error (-Back local distance unit):
• Error along the forward/backward axis  depending on the direction the machine is facing; negative values indicate a backward deviation.

• E Error (local distance unit):
• The error in the east coordinate.

• Left/Right Error (-Left local distance unit):
• Error along the left/right axis depending on the direction the machine is facing; negative values indicate a leftward deviation.

• Z Error (local distance unit):
• The vertical (elevation) error.

• Azimuth Error:
• The difference between the designed azimuth and the measured azimuth.

• Dip Error:
• The difference between the designed dip and the measured dip.

• N/S Plumb:
• The plumb (degrees) error measured in the north/south direction.

• E/W Plumb:
• The plumb (degrees) error measured in the east/west direction.

• Survey N Error (local distance unit):
• The error between the survey and design values for the north coordinate.

• Survey E Error (local distance unit):
• The error between the survey and design values for the east coordinate.

• Survey Z Error (local distance unit):
• The error between the survey and design values for the elevation coordinate.

Illustration: