For the timely retrieval of global positioning system based precipitable water vapor (GPS-PWV) over complex topography when there is no in situ pressure-derived zenith hydrostatic delays (ZHDs). this article evaluates three types of ready-made ZHD products. including two newly released products from the Vienna University of Technology (TU Wien. TUW-VMF3) and GeoForschungsZentrum Potsd... https://herbsdailyes.shop/product-category/glutathione/