Triton Isis User Manual

Page 55

June 2004 Isis® Sonar User's Manual, Volume 2

followed by a file name to be used for the file name switch.

{lom}

Serial template to parse fish longitude stored with separate
degrees and minutes. Example: S 44 38.231 W 121 17.455. The
template to parse this is {lam}N{lom}E, where E is the token for
the fish position.

{lp}

Power-bottle leak detector

{ms}

Ship speed in m/s. Converted to knots by multiplying by
1.9438445.

{m}

Conductivity in MMHO/cm. Converted to Siemens/meter by
dividing by 10.0.

{pattern=

input_string}

Isis finds any pattern of characters in input_string. Processing
of the string proceeds from that point forward. Pattern matching
is case-sensitive. If a match is not found, processing stops. Any
processing that happened before the {pattern=input_string}
token was encountered, still occurs. To specify a '}' character as
part of a pattern string, put a '\' character in front of it. For
example, {pattern=\}} will cause Isis to look for a closed-brace
character. To specify a '\' character as part of a pattern string,
use two backslashes (\\). See ‘Examples of Pattern Matching’.

{pf}

Pressure Frequency (CTD data)

{p}

is pressure in psia. Fish depth is then computed from

pressure according to a standard UNESCO formula as
follows:

(P,

φ) = 9.72659x10sP – 2.512x10-1P2 + 2.279x10-4P3 –

1.82x10-7P4
[g(

φ) + 1.092x10-4P]

Where g(

φ), the international formula for gravity, is given by:

φ) = 9.780318 (1 + 5.2788 x 10

-3

sin

φ + 2.36 x 10

-5

sin

φ)

Z = depth in meters
P = pressure in MPa
φ = latitude

The above equation is true for oceanographers’ standard ocean,
defined as an ideal medium with a temperature of 0 C and
salinity of 35 parts per thousand. Other methods for calculating

Appendix D: Serial Interfaces