A Qualitative Assessment of Close Range Photogrammetry for use in measuring Stratas/Stratums

Wahbe, Martin (2017) A Qualitative Assessment of Close Range Photogrammetry for use in measuring Stratas/Stratums. [USQ Project]

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This project was conducted for the purpose of assessing the use of Close Range Photogrammetry, using a portable high resolution camera to determine whether it will produce the same accuracy as traditional survey methods in measuring Strata/Stratums. The test was based on completing a stratum survey of a commercial building basement using a DSLR camera and an electronic tape for control data. An analysis of accuracies and precision for both types of equipment would be determined to assess the practicality and reliability of the camera in completing traditional strata and stratum surveys.

This project was undertaken to increase the speed of measuring both strata and stratum plans to compensate for the increasing amount of high density residential and commercial building being constructed within Sydney. With a high consumer demand to live closer to Sydney's CBD, land has been reclassified and rezoned to allow for multi-storey developments, which in turn requires the need for stratum plans to be produced at a subsequent rate. Similarly, this project was conducted to reduce the cost of each survey, finding an affordable alternative to equipment including 3D scanners. Reducing the time on site will also minimise the wages required for each surveyor, overall reducing the expenses to complete the job.

The close range photogrammetry method within the project was completed using a Canon EOS 600D accompanied with a Canon Tripod and swivel bracket. The control data for the stratum was completed using a Leica Disto D510, marked according to a Draft Strata Plan. The project used AutoCAD and Civilcad for the processing software for the electronic tape measurements and Photomodeler for photogrammetry extraction later to be reduced through both AutoCAD and Civilcad.

The project was completed within a section of a commercial building carpark, a common site to be used with strata/stratums. The area has approximately 12 car spots with columns between each spot. There are 3 walls that are concrete block and one that is opened with meshing. The use of electronic measurements for control data was to provide the accuracies accepted by current methods and generate a coordinate system to be used in comparison to the close range photogrammetric method.

The coordinates and areas between the different methods were compared both analytically and statistically, determining whether the accuracies are suitable for practical application. When compared to the electronically computed coordinates, the photogrammetric coordinates had minimal differences and were within the acceptable limits of the 95% confidence interval. Also when comparing the areas between the various models, the differences were acceptable to the standards set by current Strata legislation.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Honours) (Surveying)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Smith, Jessica
Date Deposited: 08 Sep 2022 01:32
Last Modified: 08 Sep 2022 01:32
Uncontrolled Keywords: close range photogrammetry; measuring; Strata/Stratums
URI: https://sear.unisq.edu.au/id/eprint/40884

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