If the computed elevation of BM 19 is 42.095 meters, what is its correct elevation?

In geodetic leveling, the correct elevation of a benchmark (BM) is determined through a precise leveling survey, and the elevation provided (42.095 meters in this case) is typically a computed value that may need further adjustment or correction based on various factors.

To identify the correct elevation among the provided choices, one must consider the possible corrections that could impact the computed elevation due to systematic errors or local adjustments. The selected answer of 42.062 meters suggests that it reflects a more accurate or adjusted value that accounts for such factors, like local sea level variations or equipment calibration issues, which could cause slight discrepancies in the computed elevation.

In practice, when validating the computed elevation, engineers often refer to established benchmarks, adjust for any known systematic errors, and compare calculated values against these benchmarks to determine the most accurate elevation. Thus, 42.062 meters may be the result after applying adjustments such as corrections for network errors or adjustments for locally measured factors, making it the most reliable answer in this context.