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When calculating the elevation difference in construction, elevation references are critical because they serve as the baseline or benchmark that provides a consistent point of measurement. Establishing accurate elevation references ensures that various elements of the construction project, such as foundations, floors, and roofs, are correctly aligned relative to one another.

Elevation references help to minimize discrepancies by offering a reliable point from which measurements can be taken. This is essential in maintaining the structural integrity of the construction and ensuring that it meets design specifications.

Survey data also plays a significant role in determining elevation, as it offers detailed geographical information and precise measurements. However, without proper elevation references, the survey data may not be effectively utilized. Building codes may dictate certain specifications related to elevation but are not directly involved in the calculations of elevation differences. Material selection is unrelated to elevation calculations and focuses more on the characteristics and suitability of the materials being used in construction. Therefore, understanding and using elevation references is fundamental for accurate elevation difference calculations in building projects.