Abstract
Recent airports are inevitably constructed on deep water areas or reclaimed land over very weak grounds as seen in the Kansai International Airport and the Tokyo International Airport.This is why countermeasures for ground subsidence have become an important issue. The level measurement is important for ensuring safe aircraft operations and maintaining airport facilities, as can be seen at the Tokyo International Airport. But the current surveys are conducted using levels and total stations. It is difficult to improve work efficiencies using this method. That is why the development of efficient measuring instruments has been required. We developed a new height measurement system combining RTK-GPS and laser level, and demonstrated the accuracy and efficiency of its potential application.
