radtrack −− shifts aircraft track to the radar analysis grid.
radtrack [-s svx:svy:rt] [-o lon0:lat0:alt0]
radtrack reads a Candis file on the standard input consisting of aircraft positions: longitude,latitude,altitude and monotime(in ks). A Candis file is written to the standard output with the horizontal positions of the aircraft are shifted according to the distance that the storm has traveled since a given reference time. The shifted aircraft positions are given by default in longitude and latitude. However, if a reference location is provided, the shifted positions will be given in km from the given reference location.
-s introduces the storm propagation velocity and the reference time.
svx is the east-west(positive toward the east) velocity in m/s.
svy is the north-south(positive toward the north) velocity in m/s.
rt is the reference time in ks.
-o introduces a reference point from where to measure the location of the aircraft in km.
lon is longitude in degrees.
lat is latitude in degrees.
alt is altitude in km.
This location is the origin of coordinates where the storm is stationary. Typically this is the origin of the grid where the radar analysis is performed -- see ngradcart.
It is assumed that longitude and latitude are in degrees and their names are lon and lat respectively; the time is is expected in ks under the name of monotime. The altitude which is used but not modified, is expected in km and to be named alt. This variables (with this units and names) are typically extracted from the radar files after they have been converted to candis files. Furthermore, lon,lat and monotime are expected to be one-dimensional vectors with the same index and size.
Note: These assumptions can be easily changed when the need arise.
NGRADCART(1)
This program was written by Carlos Lopez Carrillo and it is based on ngradcart by David Raymond.