Section 2: Specifications
Anchor: #i1011172Overview
The specifications within this chapter ensure that a survey performed with GPS technology is repeatable, meets accuracy requirements, and referenced to the National Spatial Reference System (NSRS) by providing the following:
- elimination or reduction of known and potential systematic error sources
- occupational (station) and observational (baseline) redundancy to clearly demonstrate the stated accuracy
- baseline processing, data adjustment and data analysis to clearly demonstrate the stated accuracy
- documentation demonstrating verification of the results.
GPS survey specifications continually evolve with the advancements in equipment and techniques. Changes to these specifications are expected as these advancements occur. The size, scope, and site conditions of a project may also require variations from these specifications.
Remember, any variations from these specifications should be designed to meet the above criteria and to achieve the accuracy standard of the survey; as required by this manual. All variations must be pre-approved by TxDOT and documented in the project report.