Final Report A Comparison of Mobile Scanning to a Total Station ...

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Iowa DOT SPR RB22-011 Aug 2012Survey Time Comparison:The hours listed below are approximate but are useful in comparing time used to capture theroadway data using MTLS and a total station survey.MTLS:The number of hours per work task for all activities for the MTLS process:Planning22 hoursTravel & Logistics34 hoursOn-Site Planning16 hoursScan Data Acquisition16 hoursOn-Site Pre-Processing12 hoursTrajectory Processing & Reporting8 hoursScan Data Processing, Adjustment & Reporting 16 hoursLAS Data& Image Export12 hoursLAS Data Q/C & Refinement16 hoursData Extraction140 hoursCAD Formatting16 hoursDTM Development6 hoursFinal Reports24 hoursData Assembly & Delivery8 hoursTotal 318 hoursTotal Station Survey:All field and office activitiesTotal 260 hoursBenefitsThe following is a listed of MTLS process and product benefits:• The density of data points collected is significantly greater than traditional survey andprovides the highway designer with a much better understanding of the existingroadway and associated features.• Improved safety for the survey crew members by significantly reducing the amount oftime they need to send in close proximity to the traveling public.• Improved safety to the traveling public by reducing the amount of time that surveyvehicles are present near the roadway as well as reducing the possible distraction ofsurvey activities.• The accuracy of the MTLS products meets the requirements for highway design.• The rate of data collection in the field is much greater than traditional methods.• More Data Features like Super StructuresPage 18 of 19
Iowa DOT SPR RB22-011 Aug 2012ChallengesThe following is a list of challenges to overcome with the MTLS process:• Development of specifications, similar to those found in Chapter 15 of the CaltransSurveys Manual, will be essential for the Iowa DOT to receive data meeting the needsof highway and bridge designers.• Advancement in the software that aid highway designers in fully utilizing the fullbenefits on the MTLS produced data.Summary/ImplementationWith the success of this project, it is anticipate that additional projects will be scanned forthe Iowa DOT for use in the development of highway improvement projects.Page 19 of 19
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