Practices for Construction-Ready Digital Terrain Models (2021) / Chapter Skim
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Pages 45-64
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45 Survey Questionnaire A P P E N D I X A
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46 Practices for Construction-Ready Digital Terrain Models Email to Potential Participants From: NCHRP Staff To: Members of AASHTO Standing Committee on Construction Subject: NCHRP Project 20-05/Synthesis Topic 51-01: Practices for Construction-Ready Digital Terrain Models Dear AASHTO Committee on Construction (COC) Member, Hope you had a safe and wonderful holiday season and Happy New Year!
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Survey Questionnaire 47 DTM Survey Questionnaire NCHRP Synthesis 51-01: Digital Terrain Models for Construction NCHRP SYNTHESIS Project 20-05/Topic 51-01 PRACTICES FOR CONSTRUCTION-READY DIGITAL TERRAIN MODELS QUESTIONNAIRE Dear AASHTO Committee on Construction (COC) Member, The Transportation Research Board (TRB)
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48 Practices for Construction-Ready Digital Terrain Models What department of transportation (DOT) do you work for?
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Survey Questionnaire 49 oMaine oMaryland oMassachusetts oMichigan oMinnesota oMississippi oMissouri oMontana oNebraska oNevada oNew Hampshire oNew Jersey oNew Mexico oNew York oNorth Carolina oNorth Dakota oOhio oOklahoma oOregon o Pennsylvania
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50 Practices for Construction-Ready Digital Terrain Models oRhode Island o South Carolina o South Dakota o Tennessee o Texas oUtah oVermont oVirginia oWashington oWest Virginia oWisconsin oWyoming What division do you work for within your agency? oHighway Design oCADD/Support o Surveying/Support oConstruction oOther ________________________________________________
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Survey Questionnaire 51 How would you best describe your role in the agency? o Field Engineer/Inspector oConstruction Engineer/Engineer Manager oMaterials Engineer/Technician oCADD/Technical Support oDesigner oOther ________________________________________________ Approximately how many projects use DTMs in a year in your organization?
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52 Practices for Construction-Ready Digital Terrain Models How frequently do you use DTMs in the construction inspection process? oNever oRarely o Sometimes oOften oAlways Indicate the source of DTMs used on your state's construction projects with your best estimation: 0 10 20 30 40 50 60 70 80 90 100 % created in-house % created by an outside consultant
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Survey Questionnaire 53 Never Rarely Sometimes Often Always Field Staking o o o o o Progress Checks o o o o o Quantity Measurements o o o o o Automated Machine Guidance o o o o o Grade Work o o o o o Pavement Thickness Checks (Including Aggregate Base Courses) o o o o o QA/QC, Clash Detection, or Reducing Plan Discrepancies o o o o o Cost Analysis for Initial Construction Bid o o o o o Cost Analysis for Future Maintenance o o o o o How has your state transportation agency used DTMs in projects?
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54 Practices for Construction-Ready Digital Terrain Models Work Planning, Productivity, or Efficiency o o o o o Survey Verification o o o o o Other o o o o o What DTM training is provided to the construction inspection staff in your state? Please check all that apply.
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Survey Questionnaire 55 Please evaluate the following aspects of DTMs that are handed over to contractors for their use on projects based on the perspective of the DOT. Very Low Low Moderate High Very High Not Applicable Accuracy compared to PDF/printed (contract)
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56 Practices for Construction-Ready Digital Terrain Models Please evaluate the following aspects of DTMs that are handed over to contractors for their use on projects based on the perspective of contractors (as perceived by the DOT)
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Survey Questionnaire 57 What size projects do you use DTMs for (based on engineer's estimate of cost)
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58 Practices for Construction-Ready Digital Terrain Models What project delivery methods have you used DTMs with? Please check all that apply.
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Survey Questionnaire 59 Please provide a brief description of your involvement in using DTMs on highway construction projects. (This question is optional.)
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60 Practices for Construction-Ready Digital Terrain Models Please rate the project-specific benefits of using the DTM, in terms of the following areas. No Benefit Very Low Low Moderate High Very High Reduced Risk During Bidding for Contractors and/or DOTs o o o o o o Fewer Change Orders or Construction Revisions o o o o o o Fewer Project Delays o o o o o o Earlier Identification of Plan Discrepancies and Conflicts o o o o o o Improved Communication on the Project o o o o o o Easier to Calculate Construction Quantities o o o o o o Other o o o o o o
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Survey Questionnaire 61 Considering long-term benefits of DTM use across DOTs, please state the level of agreeableness with the following statements. Please indicate one response for each.
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62 Practices for Construction-Ready Digital Terrain Models What barriers exist for adoption or further implementation of DTMs on highway construction projects? Please check all that apply.
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Survey Questionnaire 63 What is included in the written language of your DOT's policy manual(s) /contract document that the contractor is bound to, regarding the DTMs used in construction?
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64 Practices for Construction-Ready Digital Terrain Models Place in order from top to bottom with the document taking precedence placed at the top when a conflict arises. ______ 2D blueprints ______ Written specifications ______ 3D model/DTM How has your state verified the accuracy of the DTM used in construction?
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