PT Journal AU Heublein, M Bradley, PE Hinz, S TI Observing geometry effects on a Global Navigation Satellite System (GNSS)-based water vapor tomography solved by least squares and by compressive sensing SO Annales geophysicae PY 2020 BP 179 EP 189 VL 38 IS 1 DI 10.5194/angeo-38-179-2020 LA english ER