To ask the Secretary of State for Transport, whether HS2 Ltd has used (a) InSAR surveys and (b) other survey methods to survey ground movements on the proposed route of phase 2B of HS2 between Crewe and Manchester/Leeds.
7 September 2016
HS2 Ltd has not commissioned any satellite (InSAR) surveys nor (to date) any purchase of existing/historical data or bespoke analysis of that.
HS2 Ltd has carried out two Lidar surveys of the proposed route of phase 2B of HS2 between Crewe and Manchester, with a view to comparing the two datasets to appraise ground movements in the time between the two surveys. This is work in progress. Other available Lidar data (made available by the Environment Agency) has been used to manually appraise ground movements of specific locations in the saltfield.