We like to think that the proper implementation of ground control, especially when you consider all factors (including cost), is more of an art than just a necessity. Sure, anyone that has a basic understanding of the technology and general requirements could develop a control plan, but it’s likely to be either over-engineered (resulting in significantly higher cost), or insufficient to meet the true project requirements; higher costs and possibly additional field visits. A quality control plan should create efficiencies across the board.
Detailed Mission Planning efforts are a key component to the success of any field survey. Mission Planning efforts for Mobile LiDAR surveys also include a concerted focus on required ground control. Project requirements ultimately drive the implementation of control, but there are a myriad of factors and options that must also be closely considered.
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| Control layout for a 4-lane divided highway. Additional control is placed as the bridge to account for GPS outage. |
The design and layout of a proper control plan needs to address: client requirements or standards, driving speeds, site access restrictions/limitations, sensor orientation, staff safety, localized obstructions (traffic, vegetation, elevated or sunken roadways, etc), style/type of target, terrain, control point spacing, and processing software limitations among others. A control plan specialist is an integral part of the project team. Their decisions and interpretation of local conditions could dictate the overall success or failure of the mission.
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| The control layout for a city-wide Mobile LiDAR collection. |
A control plan specialist is an integral part of the project team. Their decisions and interpretation of local conditions could dictate the overall success or failure of the mission.
Cheers!
Stephen
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