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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22. Data Structure<br />

22.9.3 Meteo and Water Vapor Radiometer Data<br />

Type: ASCII<br />

Directory: Campaign-specific directory ATM.<br />

Extension: MET<br />

Content: Station surface meteorological data or water vapor radiometer data.<br />

Created by: RXMBV3 (”Menu>RINEX>Import RINEX to <strong>Bernese</strong> format>Meteo files”)<br />

Used by: <strong>GPS</strong>EST as a priori troposphere information.<br />

Example: Figures 22.48 (type 1) and 22.49 (type 3). Example files are available in the<br />

distribution in ${X}/DOC.<br />

Remarks:<br />

• There is one meteo file per station (session-independent). The time difference between<br />

subsequent epochs is not essential. If the subroutine METEO gets a request to calculate<br />

tropospheric refraction at time t, this value is calculated by linear interpolation of the<br />

table values in this file, where the two nearest times of recorded meteo data are used.<br />

• File structure:<br />

The first record characterizes the campaign. The second record defines the station<br />

name, the difference local time – UTC (meteorological data may be recorded in local<br />

time), and the data type. The following types of meteo files are allowed:<br />

Type 1 Pressure (mbar), temperature (Celsius), humidity (%).<br />

Type 2 Pressure (mbar), dry temperature, wet temperature (both in Celsius).<br />

Type 3 dr (m), where dr is the total tropospheric zenith delay.<br />

Type 4 Obsolete, replaced by troposphere parameter file (see Section 22.9.1).<br />

Type 5 Pressure (mbar), temperature (Celsius), humidity (%), and zenith wet<br />

delay.<br />

Type 6 Pressure (mbar), temperature (Celsius), humidity (%), and precipitable<br />

water vapor.<br />

The following models (mapping functions) are allowed for type 3:<br />

Model 0 1/cos(z) mapping<br />

Model 1 simplified Herring mapping<br />

• The meteo file has to end with a blank line (or a line starting with -1).<br />

SLR 8834 METEO FILE FOR SLR CAMPAIGN<br />

STATION : 8834 WETT UTC-LOCAL TIME(HOURS) = 0 TYP= 1 #VALUES= 3 MOD= 0<br />

JJ MM DD HH MM SS PPP.PP TT.TT HH.HH<br />

3 12 11 8 48 5 946.70 4.20 52.00<br />

3 12 11 9 24 12 946.70 4.70 52.00<br />

3 12 11 9 26 34 946.70 4.70 52.00<br />

.. .. .. .. .. .. ... ... ...<br />

Figure 22.48: Meteo (MET) file of type 1.<br />

Page 536 AIUB

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