World sea levels

Tide Gauge Details - Bangladesh - Chittagong

Device description

Name
Bangladesh - Chittagong
Country
Bangladesh
Group
TD UNESCO
Lat/Lon
22.3333 / 91.824997

Last measured values

Time(UTC)
16 May 2025 02:24:00
Latency
34695133
Level
-1.17

Harmonics

Points count
5950984
First date
01 May 2013 00:01
Last date
16 May 2025 02:24

Click on following link to see data:

Harmonics Constatns
Comp # Period (day) Cos factor (m) Sin factor (m)
0 0.00000 4.11853E+0 0E+0
1 0.12877 -4.35881E-6 -2.05045E-3
2 0.12886 -7.34937E-5 4.91458E-3
3 0.12938 -5.75319E-4 5.38253E-3
4 0.14707 7.24142E-5 -9.99876E-4
5 0.16841 -2.62425E-3 3.71621E-3
6 0.16857 4.9128E-3 -4.74412E-3
7 0.17036 5.11023E-3 5.29982E-3
8 0.17052 -1.93731E-2 -2.18257E-2
9 0.17251 -1.85457E-2 1.41991E-2
10 0.17470 3.15042E-3 -3.60782E-3
11 0.19989 -2.37406E-3 -1.8368E-4
12 0.20545 -1.81241E-3 -7.9045E-3
13 0.24966 -8.5749E-3 1.02709E-3
14 0.25000 1.34879E-2 -1.66728E-3
15 0.25395 8.25442E-3 1.52323E-2
16 0.25431 -1.74967E-2 -6.08022E-2
17 0.25631 4.66191E-3 -7.56581E-4
18 0.25667 -1.17769E-2 -8.41869E-4
19 0.25876 -6.26651E-2 1.70813E-2
20 0.26122 7.69226E-3 2.60051E-2
21 0.33303 4.66252E-3 5.97595E-3
22 0.34071 1.242E-2 -1.03032E-2
23 0.34135 9.00972E-3 -8.84615E-3
24 0.34502 7.51568E-3 1.60507E-3
25 0.34943 -9.96604E-3 -1.34154E-2
26 0.48977 8.28173E-4 -6.67561E-4
27 0.49109 -2.79161E-2 1.12927E-2
28 0.49863 1.13979E-1 1.07218E-1
29 0.49932 -2.5447E-2 5.30484E-2
30 0.50000 -3.80634E-1 -4.47703E-1
31 0.50798 4.32889E-2 9.09639E-2
32 0.50924 3.8972E-2 -2.91997E-2
33 0.51606 7.84378E-3 2.00617E-2
34 0.51679 1.26338E-1 -1.59811E-2
35 0.51753 -1.24667E+0 1.00996E+0
36 0.51826 2.36321E-2 -1.78554E-1
37 0.52608 -9.08534E-2 3.00126E-2
38 0.52743 2.21529E-1 2.24741E-1
39 0.53632 -1.29844E-3 -1.14E-1
40 0.53772 1.70632E-2 -2.82669E-2
41 0.54697 -4.00774E-2 9.72324E-3
42 0.54843 -7.86264E-4 2.61254E-3
43 0.89909 -8.84393E-4 -2.46048E-3
44 0.92942 -3.59691E-3 3.31424E-3
45 0.93417 -9.74003E-3 1.13355E-2
46 0.96244 5.54631E-3 1.83176E-3
47 0.96696 -5.20999E-3 -5.40288E-3
48 0.99185 4.35226E-3 2.56481E-3
49 0.99455 -3.44682E-3 -1.33048E-3
50 0.99727 -1.27812E-3 -1.7073E-1
51 1.00000 -1.9922E-2 3.50672E-3
52 1.00275 1.97995E-2 -4.24499E-2
53 1.00551 5.44646E-3 5.08951E-3
54 1.02954 -3.13784E-3 3.71327E-3
55 1.03472 -3.89034E-4 -3.16501E-3
56 1.04061 3.75939E-3 -1.87037E-3
57 1.06951 8.27684E-3 -7.9636E-3
58 1.07581 -6.10111E-2 -4.10582E-2
59 1.11346 -8.14844E-4 -1.21877E-3
60 1.11951 -4.61438E-3 6.14315E-3
61 1.16035 -2.4471E-3 -7.09751E-3
62 1.16693 -1.13023E-3 1.31537E-4
63 1.21136 -6.09352E-4 1.42264E-3
64 13.66079 -1.74886E-2 6.15995E-3
65 14.76529 -4.09734E-4 4.03096E-2
66 27.55455 -1.10876E-3 3.21249E-2
67 31.81193 3.19487E-2 -1.03141E-2
68 182.62118 5.36046E-2 -1.14952E-1
69 365.25998 -4.76151E-1 -4.03542E-1
Mathematical Formula
Tide calculation mathematical formula
Visual Basic Syntax
Function EstimateTideValues() As [Function]
                        Dim Pi As [Double] = Math.PI
                        Dim sum As [Double] = harmonics(0, 1)
                        For k As Int16 = 1 To harmonics.GetUpperBound(0)
                        Dim period As [Double] = 2 * Pi / harmonics(k, 0)
                        Dim coefCos As [Double] = harmonics(k, 1)
                        Dim coefSin As [Double] = harmonics(k, 2) 
                        sum = sum + coefCos * Math.Cos(time * period)
                        sum = sum + coefSin * Math.Sin(time * period)
                        Next
                        Return sum
                        End Function
C# Syntax
double EstimateTideValues()
                        {
                        double Pi = Math.PI;
                        double sum = harmonics[0, 1];
                        for (int k=1; k <= harmonics.GetUpperBound(0); k++)
                        {
                        double period = 2 * Pi / harmonics[k, 0];
                        double coefCos = harmonics[k, 1];
                        double coefSin = harmonics[k, 2];
                        sum += coefCos * Math.Cos(time * period);
                        sum += coefSin * Math.Sin(time * period);
                        }
                        return sum;
                        }

Axis ranges

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