get_hycom_online

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get_hycom_online

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A MATLAB function to download hycom data easily

get_hycom_online 최신버젼 다운로드

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# get_hycom_online

A MATLAB function to download hycom data easily (1992-10-02 to present)

### Main features

- Integrated 14 HYCOM products (including the latest ESPC-D-V02).
- Supports longitude ranges in both [-180, 180] and [0, 360].
- Automatically merges data when the requested region crosses meridional boundaries.
- Downloads available in MAT or NetCDF format with customized prefix names.
- Automatically skips previously downloaded data.

## Example-1: Download HYCOM data of a particular moment

```Matlab
clc;clearvars
aimpath = 'E:\data\';
region = [190 240 -5 5]; % Niño 3.4
% region = [160 210 -5 5]; % Niño 4 
timeTick = datetime(2010,1,1);
varList = {'ssh','temp','salt','uvel','vvel'};    
D = get_hycom_online(aimpath, region, timeTick, varList);
```

## Example-2: Download HYCOM data in netcdf format and customize prefix names

```Matlab
clc;clearvars
aimpath = 'E:\data\';
region = [117.5 122.5 37 41]; % the Bohai Sea
timeTick = datetime(2010,1,1);
varList = {'ssh','temp','salt','uvel','vvel'};
D = get_hycom_online(aimpath, region, timeTick, varList, 'format', 'netcdf', 'prefix', 'bohai_sea');
```

## Example-3: Download HYCOM data in batch

```Matlab
clc;clearvars
aimpath = 'E:\data\';
region = [117.5 122.5 37 41]; % the Bohai Sea
timeList = datetime(2020,1,1):hours(3):datetime(2020,2,1);
varList = {'ssh','temp','salt','uvel','vvel'};

nTimes = numel(timeList);
for iTime = 1:nTimes
    timeTick = timeList(iTime);
    D = get_hycom_online(aimpath, region, timeTick, varList);
end
```

## Example-4: Download data from a specified HYCOM product

```Matlab
clc;clearvars
aimpath = 'E:\data\';
region = [261 280 17.5 32.5]; % the Gulf of Mexico
timeTick = datetime(2010,1,1);
varList = {'ssh','temp','salt','uvel','vvel'};    
URL = 'http://tds.hycom.org/thredds/dodsC/GLBy0.08/expt_93.0?';
D = get_hycom_online(aimpath, region, timeTick, varList, 'URL', URL);
```

<br>

## Notes

Niño 4 region is a good example because it crosses the longitudinal boundaries ([-180,180]) of some hycom products. In this case, the function will splice the west and east parts together to get the desired data.

![sample](https://raw.githubusercontent.com/wenfanwu/get_hycom_online/main/figures/nino4.png)

<br>

Tidal signals are included in the latest HYCOM product (ESPC-D-V02), as illustrated in the figure below, whereas they were absent in earlier versions.

![sample](https://raw.githubusercontent.com/wenfanwu/get_hycom_online/main/figures/ssh.png)

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