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ATMOSPHERE FORMAT
The ATM values are saved in binary files which use an ad-hoc format (in
particular, this is not the Gildas Data Format). They are Fortran unfor-
matted (binary) files, usually read in direct access mode with 128 words
(512 bytes) records. The values are written in the current machine sys-
tem (IEEE, EEEI, ...); this system is saved as the very first word in
the file.
The file consists in a succession of tables describing the opacities,
atmospheric emission, and optical length in the space of pressure, tem-
perature, frequency, water vapor, and airmass. The values in the tables,
and the tables themselves, are written contiguously (no blanks inserted
e.g. no alignment on the records). Here is the exact sequence:
Code C*4 [ ] System code
Np I*4 [ ] Number of pressure values
Nt I*4 [ ] Number of temperatures
Nf I*4 [ ] Number of frequencies
Nw I*4 [ ] Number of precipitable water vapor amounts
Na I*4 [ ] Number of airmass values
P[Np] R*4 [HPa ] Pressure values
T[Nt] R*4 [K ] Temperaure values
F[Nf] R*4 [GHz ] Frequencies
W[Nw] R*4 [mm ] Precipitable water vapor amounts
A[Na] R*4 [ ] Airmass values
tauox[Nf,Nt,Np] R*4 [neper] Opacity (dry component)
tauw[Nf,Nt,Np] R*4 [neper] Opacity (wet component)
Temis[Na,Nw,Nf,Nt,Np] R*4 [K ] Atmospheric emission
Path[Na,Nw,Nf,Nt,Np] R*4 [cm ] Optical length
Gildas manager
2024-04-19