Tidal Highs and Lows

Data Format

Digital tidal high and low data, either observed historically or predicted using harmonic constituents, are available in standard 80-character length record format as follows:

Sample:

---------0---------0---------0---------0---------0---------0---------0---------0
90 1234 01 011965  530 24.3 1145  3.8 1800 25.1 9999 99.9
91 1234 02 011965   20  3.8  630 23.9 1245  4.1 1900 25.2
91 1234 03 011965  120  3.5  735 23.8 1350  4.2 2000 25.3
70   65  5  11969   33 7.04  633 1.34 1246 7.68 1856  .85
70   65  6  11969  106 7.07  707 1.31 1313 7.62 1928  .85
70 9964 31 121984 999999.99 999999.99 999999.99 999999.99
DATA RECORD:
BYTE            DESCRIPTION
----            -----------
1               1-digit integer, card code 
                        9=elevation in feet
                        7=elevation in meters
2               1-digit integer indicating first tide
                        0=first tide is high water
                        1=first tide is low water
3-7             5-digit integer, right-justified, unique station 
                identification number
8               blank
9-10            2-digit integer, day
11              blank
12-13           2-digit integer, month
14-17           4-digit integer, year
18              blank
19-22           4-digit integer, time in HHMM of first tide
23-27           5-character field, right-justified, elevation of first tide
                with floating decimal point
28              blank
29-32           4-digit integer, time in HHMM of second tide
33-37           5-character field, right-justified, elevation of second tide
                with floating decimal point
38              blank
39-42           4-digit integer, time in HHMM of third tide
43-47           5-character field, right-justified, elevation of third tide
                with floating decimal point
48              blank
49-52           4-digit integer, time in HHMM of fourth tide
53-57           5-digit integer, right-justified, elevation of fourth tide
                with floating decimal point