THE EFFICIENCY EMPLOYMENT OF CLOSE-RANGE PHOTOGRAMMETRY TO  MEASURE AND MODEL POTHOLES IN ASPHALT PAVEMENT

AHMED RAMZY  JAMEE; RAAD AWAD  KATTAN

doi:10.26682/sjuod.2020.23.2.19

AHMED RAMZY JAMEE Dept. of Civil Engineering, College of Engineering, University of Duhok, Kurdistan Region-Iraq
RAAD AWAD KATTAN Dept. ofSurveying Engineering, College of Engineering, University of Duhok, Kurdistan Region-Iraq

DOI: https://doi.org/10.26682/sjuod.2020.23.2.19

Keywords: Distress, Close range photogrammetry, 3-D Modelling, GCPs, Agisoft PhotoScan.

Abstract

The objective of this study is to measure and model potholes distress in the pavement road surface,
which form a major type among several distresses exist in road networks. In this research close-range
photogrammetry is used to represent potholes distress, this approach allows converting images of the
studied potholes into a 3-D model. Ground control points (GCPs) have to be distributed uniformly to
cover the whole measured area helping to solve analytically for the unknown coordinates of the measured
area point cloud and acquiring a georeferenced model with known coordinates.
Agisoft PhotoScan was used for potholes modelling, which is a user-friendly software that allows for 3-
D modelling, producing digital elevation models, point clouds, and orthomosaic. The Agisoft PhotoScan
initial assessment test on a model similar in shape to a real pothole reviles that the best accuracy acquired
using 8 GCPs distributed regularly to cover the shape of the pothole have a maximum discrepancy of -
2.16cm in Z coordinates of one point. The obtained root mean square errors RMS were ±0.79 ±0.78
±0.67cm in X, Y, and Z coordinates respectively.
In a real pothole modelling tests on two sites and comparing the model check points coordinates with
the ground coordinates, the RMS obtained were, ±0.85, ±0.58, ±0.44 cm and ±0.32, ±0.27, ±0.39cm in X, Y
and Z coordinates respectively. Both potholes can be classified as high level potholes as their depths are
more than 50mm in accordance with known specifications. In volume test carried out on the first model,
the Agisoft PhotoScan generated volume was 8413 cm3
confirmed the volume measured with the
standard soil test known as sand replacement method which gave a volume of 8311 cm3
.

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