infrastructures. since subsidence was established in one thousand nine hundred eighty one in shanghai they've measured a lot of elevation of two to three meters. allow me for you. to keep watch on this change the city built an extensive surveillance network. through the storm. this is our ground subsidence monitoring network for shanghai. it's made up of thirty seven land subsidence monitoring stations. we're here in one of the this is where we monitor the evolution of ground subsidence and the different layers at various steps. today the measurements are carried out fully automatic lay the real time monitoring of the different soil layers makes it possible to observe the variations of subsidence more than two hundred meters below
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