Which type of survey has a minimum closure error of 1 : 15,000?

The type of survey that has a minimum closure error of 1:15,000 is an Urban Class A survey. This standard is established to ensure a high level of accuracy necessary for urban areas where development and construction require detailed measurements to avoid conflicts and legal issues.

Urban Class A surveys are typically performed in locations where precise location information is critical due to the density of buildings, infrastructure, and other land uses. The closure error means that for every 15,000 units measured, the total error should not exceed 1 unit, allowing for very tight tolerances in measurement.

In contrast, other types of surveys may have less stringent closure errors due to factors such as terrain difficulty or lower requirements for precision in less developed areas. This focus on accuracy in Urban Class A surveys is particularly important because even small discrepancies can lead to significant problems in urban environments, such as property disputes or conflicts with existing infrastructure.