Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
nxg = IESAMP - IBSAMP+1
nyg = JESAMP - JBSAMP+1
CALPUFF contains an option to compress the data by replacing strings of zeroes with a coded repetition
factor. The factor is a negative number whose absolute value indicates the number of consecutive zeroes
that have been replaced by the repetition factor. This method is especially useful in reducing the size of
the output file when large segments of the receptor arrays lie upwind of the puffs during an hour, thereby
producing long strings of zeroes in the output arrays. For example, the following record with data for 20
receptors requires 20 unpacked words:
0.0, 0.0, 0.0, 0.0, 0.0, 1.2, 3.5, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.7, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
These data in packed form would be represented in six words:
-5., 1.2, 3.5, -6., 0.7, -6.
Table 9-55:
Unformatted DFLX.DAT File - Data Records
(Records 1 and 2 of each set)
No. Variable Type Description (Record 1)
1 NYRB integer Year (4 digits) at start of averaging period
2 NJULB integer Julian day at start of averaging period
3 NHRB integer Hour (00-23 LST) at start of averaging period
4 NSECB integer Second (0000-3600 LST) at start of averaging period
5 NYRE integer Year (4 digits) at end of averaging period
6 NJULE integer Julian day at end of averaging period
7 NHRE integer Hour (00-23 LST) at end of averaging period
8 NSECE integer Second (0000-3600 LST) at start of averaging period
No. Variable Type a Description (Record 2)
1 ISTYPE integer Source type
2 ISNUM integer Source number of this type
3 SNAME C*16 Source name
4 SXKM real Source X-coordinate (km) in the modeling map projection
5 SYKM real Source Y-coordinate (km) in the modeling map projection
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