Dimensional surveys and dimensional control describe the high order three dimensional precision measurement and positioning in engineering environments.

Typical projects involve the initial measurement of available space, measurement of the fabricated units and positioning of the units within the space.

A variety of proven measurement techniques are employed and instrumentation tends to be specially calibrated in order to achieve the required precision.

Instrumentation includes electronic levels, one second electronic theodolites and calibrated total stations and REDM units. However, more important than the instrumentation is the experience of the surveyors with this type of work and their understanding of precision measurement within a three-dimensional engineering environment.