The surveys conducted to establish the positions of points of reference for projects with limited geographic coverage, covering primary control (third order), secondary control (fourth order), and tertiary control, are called:

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Establishing a framework of reference points with defined accuracy levels (primary control at third order, secondary control at fourth order, and tertiary control) over a project’s limited area creates a consistent baseline for all field surveys. This network of control points is specifically built to support the project’s surveying needs, ensuring that all measurements can be tied to common coordinates. That process is called project control surveys. The other terms don’t capture this specialized purpose; they imply broader or different activities rather than the systematic creation and densification of a coordinated control network for a project.