The ODF directory is set via the environment variable SAS_ODF. Full use of the OAL calls is required to determine the state and availability of the particular ODF desired. These calls are described in the XMM ODF Access Layer library oal. Other OAL calls can be exploited to retrieve information useful for the output Orbit file as keywords.
The position and velocity vectors returned by OAL_getPosition are extra/interpolated by that subroutine.
It does not appear that any information on the error of the orbit measurements will be available to the PPS. This deficiency should be addressed. As the access subroutine returns orbit parameters for any time specified, the user will need to input the time interval for sampling the orbit parameters.
The value HUGE (ieee NaN) is substituted for any column not correctly retrieved or inter/extrapolated by the OAL.
