Parse_descriptor
t_err Parse_descriptor (t_data_descr * dd, byte_t * data)This function parse a first PAS L0 packet containing 3D data descriptor and extract:
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nb_cem + cem_offset
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nv_elevation + first elevation
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nb_energy + first_energy
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nb_sample
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nb_K
Then computes size of expected data, registered in the following PAS 3D data packets:
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sampling_size = nb_cem * nb_elevation * nb_energy * size (int16_t)
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total_size = sampling_size * nb_k
All these values are registered in the t_data_desr * dd structure.
Store_3D_counts
This function populates a 9 x 11 x 96 matrix of counts :
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from a byte array of counts (dd→data)
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for a given k, where 0 ⇐ k ⇐ dd→k
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setting nb_elev x nb_cem x nb_cem values, in the corresponding cells
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taking in accounfs offset form first_energy, first_elevation and cem_offset
t_err Store_3D_counts (t_data_descr *dd, t_counts_3d counts, int k)
{
byte_t * ptr = dd->data + dd->sampling_size * k);
for (energy = 0; energy < dd->nb_energy; energy++) {
int en = dd->first_energy + energy;
for (elevation = 0 elevation < dd->nb_elevation; elevation++) {
int el = dd->first_elevation + elevation;
for (cem = 0; cem <= dd->nb_cem; cem++) {
int c = dd->cem_offset + cem;
short value = get_int16 (ptr);
counts [c][el][en] = value;
ptr += 2;
}
}
}
}Write_CDF_record
This function will write k CDF records from data contained in t_data_descr descriptor.
t_err Write_CDF_record (char * key, t_data_descr * dd)
{
// use key : swa-pas-3ds, swa-pas-3db, swa-pas-3dt, swa-pas-3dn
// to select CDF output file
for (k = 0; k < dd->k; k++) {
// Populates 3D matrix with data from k sampling
Store_3D_counts (dd, counts_3D, k);
// Write counts in a new CDF record
Put_CDF (cdf, "COUNTS", record, & counts_3d);
record ++;
}
}