https://github.com/gher-uliege/seadatacloud

Tools and interfaces to work with DIVA interpolation software tool.
https://github.com/gher-uliege/seadatacloud

data-analysis data-visualization interpolation nco netcdf ocean-sciences oceanography

Last synced: 12 days ago
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Tools and interfaces to work with DIVA interpolation software tool.

• Host: GitHub
• URL: https://github.com/gher-uliege/seadatacloud
• Owner: gher-uliege
• Created: 2017-01-13T16:49:22.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2022-02-08T10:42:08.000Z (almost 3 years ago)
• Last Synced: 2024-11-01T18:11:52.610Z (about 2 months ago)
• Topics: data-analysis, data-visualization, interpolation, nco, netcdf, ocean-sciences, oceanography
• Language: Jupyter Notebook
• Size: 23.3 MB
• Stars: 3
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# SeaDataCloud

Tools and interfaces to work with DIVA interpolation software tool. 

## Re-gridding

Re-gridding is the action of interpolation a field from a grid to another grid, usually with a higher resolution.     

[nco](http://nco.sourceforge.net) provides a tool [`ncremap`](http://nco.sourceforge.net/nco.html#ncremap) for this purpose. 

### Installation

1. Download and compile [ESMF](https://earthsystemmodeling.org/download/)

2. Download a recent version of nco.

### Usage

```bash

ncremap -i data.nc -d grid.nc -o data_regridded.nc

```

where:

- *data.nc* is the original file containing the fields,

- *grid.nc* is another file containing the new grid

- *data_regridded.nc* is the final output file with the fields interpolated onto the new grid.

The grid file looks like:

```

dimensions:

	longitude = 851 ;

	latitude = 321 ;

variables:

	float longitude(longitude) ;

		longitude:units = "degrees east" ;

	float latitude(latitude) ;

		latitude:units = "degrees north" ;

}

```

Note that the input file needs to have lon and lat as coordinates. If that's not te case, one can always use [`ncrename`](https://linux.die.net/man/1/ncrename), for instance:

```bash

ncrename -d x,lon -v x,lon in.nc

```

* the dimension *x* is renamed *lon*

* the variable *x* is renamed *lon*

### Troubleshooting

#### NetCDF 

If you get errors related to netCDF, define the environment variables as in:     

http://www.earthsystemmodeling.org/esmf_releases/last_built/ESMF_usrdoc/node9.html#SECTION00093200000000000000

#### Grid file

It seems that the dimensions should be named *longitude* and *latitude*, otherwise the result is strange.