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title	Table of Contents

Table of Contents

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exclude	Reading the GNSS in-situ observation files\|Download test data\|Open the file\|Decode text fields\|Selecting data with xarray\|Selecting data with pandas\|Arrange the data with one variable per column

Acronyms

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AC	Analysis Center
AMSL	Height Above the Mean Sea Level
ATBD	Algorithm Theoretical Basis Description
C3S	The Copernicus Climate Change Service
CDDIS	The Crustal Dynamics Data Information System
CDM	Common Data Model
CDR	Climate Data Records
CDS	Climate Data Store
CODE	Center for Orbit Determination in Europe
CSV	Comma Separated Values
DB	Data Base
DC	Data Center
ECMWF	European Centre for Medium-Range Weather Forecasts
EGM2008	Earth Gravitational Model released by the National Geospatial-Intelligence Agency (NGA) EGM Development Team
EPN	EUREF Permanent GNSS Network
EPN-repro2	The 2^nd reprocessing campaign of EPN
ERA5	ECMWF Reanalysis v5
EUREF	European Reference Frame
GFZ	GFZ German Research Centre for Geosciences
GNSS	Global Navigation Satellite System
IGS	International GNSS Service
IGS-repro3	The 3rd reprocessing campaign of IGS
IPW	Integrated Precipitable Water
NetCDF4	Network Common Data Form, version 4
NRT	Near Real Time
RMSD	Root Mean Square Deviation
SC2	Service Contract 2
SINEX	Solution (Software/technique) INdependent EXchange Format
SINEX TRO	SINEX for combination of TROpospheric estimates
STDDEV	Standard Deviation
USNO	U.S. Naval Observatory
ZHD	Zenith Hydrostatic Delay
ZTD	Zenith Total Delay
ZWD	Zenith Wet Delay
σZTD	Formal uncertainty of ZTD

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	table1
	table1

Table 1: Average IPW bias and RMSD between IGS data and co-located techniques.

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	figure5
	figure5

Figure 5: IPW differences in IGRA−IGS daily, ERA5−IGS daily, MWR−IGS daily, and GRUAN RS−IGS daily co-location datasets.

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Table 2. Metadata table

standard name	description
report_id	This parameter starts from 1 for the first data report provided in the data file, and is incremented for each new report.
report_timestamp	Observation date time UTC
station_name	GNSS station identifier
city	City name
latitude	Latitude deg. North
longitude	Longitude deg. East
height_of_station_above_sea_level	Altitude above mean sea level

Table 3. Data table

standard name	description
zenith_total_delay	It is one of the final products from geodetic GNSS data processing software, characterizing a delay of the GNSS signal on the path from a satellite to the receiver due to atmospheric refraction and bending, mapped into zenith direction. The numerical value of the zenith total delay correlates with the amount of total column water vapour (i.e., not including liquid water and/or ice) overhead the GNSS receiver antenna.
uncertainty_value1	Rough estimate of standard uncertainty equivalent to 1-sigma uncertainty of zenith total delay
total_column_water_vapour	Total column water vapour derived from ZTD and ancillary meteorological data
uncertainty_value5	Total uncertainty of GNSS total column water vapour
total_column_water_vapour_era5	Total column water vapour retrieved from ERA5 at the station coordinates and altitude

Product Availability and data licenses

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