Some NetCDF data cannot be read by `ucar.nc2.dataset.NetcdfDataset` about netcdf-java HOT 7 CLOSED

@haileyajohnson
Sure. The link below provides the file mentioned in the code:
https://drive.google.com/file/d/1RjI8Mte5M9joROqVvHqR8yWGh-6fjdOa/view?usp=drive_link

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@anikfal,

I didn't know the new API has got such a syntax.

There was some refactoring and adding of methods and classes for opening/acquiring datasets a few years ago, maybe when NJ 5.3 was in development. I'm not sure if the NetcdfFiles or NetcdfDatasets classes existed before then. I had to figure out how to use them because I was tired of getting deprecation alerts whenever I compiled my old code for opening datasets.

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Could you provide an example of a file that isn't working as a NetcdfDataset?

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I am unable to reproduce the issue with the file you've provided. Are you using the latest version of netCDF-Java?

Unrelated to your problem, but we recommend using the newer APIs to open netcdf files and datasets, e.g.:
`NetcdfDataset dataset = NetcdfDatasets.openDataset(filepath);

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I came across a confusing situation:

I was not using the latest version (netcdfAll-5.5.3.jar). Instead, I was using the maven-built netcdf-4.3.22.jar.

With the latest version, the aforementioned problem was solved and era5.nc could be successfully read by NetcdfDataset. However, some other files that used to be read by netcdf-4.3.22.jar, could not be read by the latest version! I provide them below (they are standard and widely used environmental/atmospheric data):

1. VIIRS satellite data
2. WRF model output

More or less, the same situation happened for ucar.nc2.NetcdfFile.

I have a bunch of NetCDF files which have different metadata, attributes, and coordinate systems. This is probably something that causes such a problem and chaotic situation.

Can a user modify or develop the associated netcdf-java class and make it compatible with their own data and application?

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@anikfal, I had no trouble opening any of your three examples. Boiled down, my code does

NetcdfFile njFile = NetcdfFiles.open ( filePathStr );
NetcdfDataset njdEnhanced  = NetcdfDatasets.enhance (njFile, enhSet, null);

where enhSet is my own enhancement set which omits one of the netCDF-Java defaults.

The VIIRS example, I do not see a lot-lat gridding system of any sort. Is it defined outside the dataset?

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NetcdfFile njFile = NetcdfFiles.open ( filePathStr );

I didn't know the new API has got such a syntax. Now I can open them all. Thanks.

The VIIRS example, I do not see a lot-lat gridding system of any sort. Is it defined outside the dataset?

Yes. Coordinates are stored in separate file.

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