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.TH geo2rot
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.TH geo2rot
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.SH NAME
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.SH NAME
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.B geo2rot - rotate from true to rotated longitude and latitude
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.B geo2rot - rotate from true to rotated longitude and latitude
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.SH SYNOPSIS
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.SH SYNOPSIS
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.TP 9
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.TP 9
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.B geo2rot
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.B geo2rot
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.I [ inpfile outfile ] [optional parameters]
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.I [ inpfile outfile ] [optional parameters]
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.TP 9
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.TP 9
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.B geo2rot
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.B geo2rot
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.I [ lon lat ] [optional parameters]
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.I [ lon lat ] [optional parameters]
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.TP 9
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.TP 9
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.B geo2rot
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.B geo2rot
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.I [optional parameters]
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.I [optional parameters]
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.SH DESCRIPTION
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.SH DESCRIPTION
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Rotate the longitude and latitude coordinates from their true geographical values into their values in a rotated coordinate system. The rotation can be done either for a single <lon/lat> point or for a complete trajectory file <inpfile>. In the latter case, a new trajectory <outfile> file with rotated longitude and latitude is written.
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Rotate the longitude and latitude coordinates from their true geographical values into their values in a rotated coordinate system. The rotation can be done either for a single <lon/lat> point or for a complete trajectory file <inpfile>. In the latter case, a new trajectory <outfile> file with rotated longitude and latitude is written.
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.SH PARAMETERS
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.SH PARAMETERS
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.TP 15
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.TP 15
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.I inpfile
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.I inpfile
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input trajectory file (with true lon/lat)
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input trajectory file (with true lon/lat)
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.TP 15
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.TP 15
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.I outfile
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.I outfile
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output trajectory file (with rotated lon/lat)
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output trajectory file (with rotated lon/lat)
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.TP 15
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.TP 15
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.I lon lat
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.I lon lat
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true longitude and latitude
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true longitude and latitude
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.SH OPTIONAL PARAMETERS
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.SH OPTIONAL PARAMETERS
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.TP 15
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.TP 15
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.I -lonlat pollon pollat
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.I -lonlat pollon pollat
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specify the coordinates (pollon, pollat) of the rotated north pole
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specify the coordinates (pollon, pollat) of the rotated north pole
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.TP 15
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.TP 15
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.I -file filename
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.I -file filename
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get the coordinates of the rotated north pole from the file <filename>. The file must be a netCDF file, either a constants or a P,S file.
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get the coordinates of the rotated north pole from the file <filename>. The file must be a netCDF file, either a constants or a P,S file.
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.SH EXAMPLES
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.SH EXAMPLES
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.TP 15
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.TP 15
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.B [1] geo2rot -lonlat -170 45
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.B [1] geo2rot -lonlat -170 45
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sets the rotated north pole to 170 W and 45 N. The new position is written to the file <geo2rot.pole>.
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sets the rotated north pole to 170 W and 45 N. The new position is written to the file <geo2rot.pole>.
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.TP 15
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.TP 15
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.B [2] geo2rot 45 50
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.B [2] geo2rot 45 50
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takes coordinate (lon/lat)=(45/50) and rotates it to the rotated coordainte system. The position of the rotated pole is read from the file <geo2rot.pole>.
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takes coordinate (lon/lat)=(45/50) and rotates it to the rotated coordainte system. The position of the rotated pole is read from the file <geo2rot.pole>.
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.TP 15
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.TP 15
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.B [3] geo2rot 45 50 -file eraint_cst
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.B [3] geo2rot 45 50 -file eraint_cst
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rotates (lon/lat) = (45/50) to the new system - the new pole position is read from the file <eraint_cst>.
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rotates (lon/lat) = (45/50) to the new system - the new pole position is read from the file <eraint_cst>.
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.TP 15
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.TP 15
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.B [4] geo2rot trainp traout
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.B [4] geo2rot trainp traout
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read the trajectory file <trainp> and rotate all coordinates. The trajectory file with rotated coordinates is written to <traout>.
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read the trajectory file <trainp> and rotate all coordinates. The trajectory file with rotated coordinates is written to <traout>.
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.TP 15
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.TP 15
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.B [5] geo2rot
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.B [5] geo2rot
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write the pole position to screen.
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write the pole position to screen.
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.SH AUTHOR
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.SH AUTHOR
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Written by Michael Sprenger and Heini Wernli (July 2011)
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Written by Michael Sprenger and Heini Wernli (July 2011)
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