The VMF data server provides a tool for the creation of individual ray-traced delays for observations in the microwave spectrum. By specifying all required information
about the desired observation(s), the ray-tracing through numerical weather models (NWM) by the ECMWF is carried out automatically and the resulting .radiate file, containing
the ray-traced delays and some more parameters, is sent back to the user by email. Regarding the General Data Protection Regulation it is mentioned that we need to store your
email address for this purpose. For all observations from 1980 to 2007 the ERA-Interim NWM is used, whereas starting 2008 the Operational NWM is used.
See below for the syntax and an example of the ray-tracing input. Please mind that the number of observations (lines) is limited to 100.
Syntax of inputThe ray-tracing input must consist of the following columns:
- Modified Julian Date: real number; including decimal places in order to specify the exact observation time
- Station: maximum 8 characters
- Azimuth: real number; in radians
- Elevation: real number; in radians
- the specified station(s) must be named exactly as in the respective .ell-file
- avoid blanks in the beginning of a line (ahead of the first column)
- avoid blanks in between specified values, e.g. in station names
- avoid a line break at the end of the input
Example for input
53471.70856 KOKEE 4.456821254034057 1.202092193364012 53471.70856 NYALES20 1.218255169340251 0.437707742402452 53471.70856 WETTZELL 1.067042545998244 0.224204632314359 53471.70876 GILCREEK 2.615094914242887 0.295557085448315 53471.70876 WESTFORD 4.092016472325890 0.456109757784886 53471.71149 GILCREEK 5.757777315909077 0.301069010717596