1 Introduction
Siteaware's Digital Construction Verification system relies on the dispersion of accurately measured control points (CPs) for timely and accurate verification results. The two factors that affect the quality of the scan are 1) The dispersion of the CPs to cover the entire scan area and 2) The accuracy of the measurements themselves. This section provides guidelines for placing and measuring CPs, to ensure you receive consistent results every time you scan.
2 CP Placement Method
2.1 Control Point Marking Timing
The CPs should be marked on the columns as close to the time of the scan as possible to ensure the control markings aren’t smudged or erased.
2.2 Control Point Layout
For every pour area, Siteaware will include on the scan map the recommended column and column face that should be marked as a control point. The map will also contain the name of the CP for example, the CP below would be CP4N.
If the recommended column face is unavailable, the opposite face can be marked and the checkpoint should be renamed to CP4S.
2.3 Marking Control Points
When scanning steel structures, control points should be marked on the faces of the columns. This should be done as follows:
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Locate the column that will be used as a control point and find the face indicated on the Siteaware CP map.
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Using the grade rod, make a mark on the column 54” from the deck.
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Use the carpenter’s square and a tape measure to find the center of the column face at the 54” mark and mark an X.
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Write the name of the control point.
3 Uploading Control Points
As the locations of the controls are pre-determined, there is no need to upload any coordinate data.
Note: If using a Total Station to measure the Control Points, they can be placed at any elevation on the specified columns. Siteaware will then need the Easting, Northing, and Elevation of each point. After the stickers have been measured, upload the file containing their coordinates to the Self-Capture Upload Portal.
Reminder: The column sequence is critical, please share the coordinates as Easting, Northing, and Elevation