AASHTO PP 111:2021 Standard Practice for Definition of Terms Related to Transverse Pavement Profiling Systems and Ground| Ret ference Equipment

AASHTO PP 111:2021 Standard Practice for Definition of Terms Related to Transverse Pavement Profiling Systems and Ground| Ret ference Equipment.
1.1. AASHTO PP 111 practice is to provide standard definitions for terms used in transverse pavement profiling system specifications, test methods, standard practices, and the various quality assurance procedures.
2. TERMINOLOGY
2.1. Data Types:
2.1.1. gridded claw—A set of point cloud data whose elevation values have been interpolated to a regularly spaced grid in the horizontal plane (either X-Y or U-V).
2.1.2. ground reference daw—Set of three-dimensional measurements that constitutes reference data for evaluation of point cloud or gridded data and is collected using a GRE.
2.1.3. longitudinal profile—Perpendicular deviations of the pavement surface from an established reference parallel to the lane direction, usually measured in the wheel tracks.
2.1.4. mapping sensor mneasurement—A set of data points from an individual mapping sensor in a sensor or global reference frame. This measurement may not span the complete lane width and may be oriented at an angle relative to transverse direction.
2.1.5. point cloud data A set of irregularly spaced data points in a global or path reference frame, calculated from a combination of mapping and location sensor measurements of the road surface.
2.1.6. systerm scan—Combined set of mapping sensor measurements acquired over a single sampling time from all mapping sensors on the TPP.
2.1.7. transverse profile—Vcrtical deviations of the pavement surface from a horizontal reference perpendicular to the lane direction.
2.2. Directions:
2.2.1. longitudinal direction—Direction parallel to two consecutive lane center locations. The longitudinal direction is denoted by the V axis in the path reference frame.
2.2.2. transvere direction—Direction perpendicular to two consecutive lane center locations. The transverse direction is denoted by the U axis in the path reference frame.
2.2.3. vertical direction—Direction normal to the WGS84 ellipsoid.
2.3. Fabricated Surfaces:
2.3.1. excitation hoards—A manufactured surface that contains consecutive square bumps of specified dimensions to ensure the primary and secondary ride modes of the TPP are excited between a prescribed range of speeds.
2.3.2. macrotexture object—A manufactured object that has at least one surface (macrotexture surface) with a specified mean profile depth. The macrotexture surface shall contain a set of verifiable dimensions.
2.3.3. reference object—An object with a set of verifiable dimensions that has distinguishable features allowing for the global position and orientation of the object to be established from the TPP point cloud.AASHTO PP 111 pdf download.