the satellite , sentinel-1a , sends out radio waves and times how long it takes for them to reflect back .
the data has been transformed into an ` interferogram ' showing how the land mass has shifted .
scientists count the colored ` fringes ' in the interferogram to detect how much the land has moved .
everest lost an inch of its height in the quake , but still stands at 29,029 feet .
an area 75 miles by 30 miles around kathmandu has risen over three feet .