The Value of Data Preparation Services

Written by Chad Cooper

Created on Friday, 03 April 2009 03:18

We build a lot of data for heavy highway and site construction projects. Over the years working with clients, engineers, grading contractors and fellow data builders, I am asked many questions. While some are unique, there are a handful of questions that come up, time and time again. One of those questions is:

“Should engineers provide DTM data for construction?”

This is a sensitive subject to many so allow me to first qualify my comments. My professional experience and education have been based from working as a civil engineer. My ability to create data however is a skill set acquired from working with seasoned grade checkers, machine operators, grading contractors, land surveyors and professional engineers all masterful in their professions. The ability to think in 3D is an ongoing educational process; I learn every day.  That being said, my perspective in answering this question is based on my experience from both engineering and data preparation.

So, with that out of the way, let’s address the question. Should engineers provide data to the client? Yes and No.

My answer is not a dodge to be politically correct. Rather it is intended to bring consideration to a new question; “Should engineers provide DTM Data for construction if they have no experience in data prep?” The answer to that question is no.
It’s because designing a project from an engineer’s point of view and building data are two very different processes and they have very different scopes of work associated with each process. You can not build data the same way you build an engineering project, and I feel that this is the single largest false assumption made on the part of contractor.

My point is that data prep is a specialty with its own definitions, procedures and considerations critical in the successful implementation of 3D positioning (machine control and site management). This specialty is relatively new so in general, civil engineers are not necessarily experienced in building 3D data for machine control.

When a client procures data services, they are buying two things: One, the client is purchasing the actual model for their use in the field to construct the jobsite quickly, and efficiently using GPS machine control and staking. And two, they are paying for a check; a fresh set of eyes reviewing the project for accuracy. This approach has a lot of value especially since it takes place before any dirt is moved.

As mentioned earlier, designing a site, as an engineer is not the same as building data for use in 3D machine control. I cannot speak for all data builders but I personally rebuild the surface aspect of the engineer’s design, plan, profile, cross sections, spot elevations and when appropriate, contours. This helps me better understand the site applying my experience as both engineer and data builder. I believe this is what I am paid to do.

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