# Unable to open zip files of the CAMS global inversion-optimised greenhouse gas products **URL:** \ **Category:** CAMS - Datasets and Usage\ **Tags:** cams\ **Created:** [6 November 2024 06:35 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474 "2024-11-06T06:35:14Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Diego\_JCO](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/diego_jco/32/392_2.png) [@Diego\_JCO](https://forum.ecmwf.int/u/Diego_JCO)\ **Post date:** [6 November 2024 06:35 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/1 "2024-11-06T06:35:14Z")
I have downloaded one month of data using the API as well as the Web Interface in two different accounts. In both cases, I cannot unzip the downloaded zip file. I have tried this in three computers (Windows, MacOS and Linux). Some months ago, I had no problems. When unzipping I receive always an error message that indicates that the zip file is not a zip file. Here an example: ```auto Archive: 3dd89c3040020710fe49455087edb4d4.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of 3dd89c3040020710fe49455087edb4d4.zip or 3dd89c3040020710fe49455087edb4d4.zip.zip, and cannot find 3dd89c3040020710fe49455087edb4d4.zip.ZIP, period. ``` If I try to unzip it with Python `zipfile` package, I get a `BadZipFile` exception. ---
**Author:** ![Diego\_JCO](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/diego_jco/32/392_2.png) [@Diego\_JCO](https://forum.ecmwf.int/u/Diego_JCO)\ **Post date:** [6 November 2024 08:52 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/2 "2024-11-06T08:52:40Z")
![unzip_problems](https://forum.ecmwf.int/uploads/default/original/1X/c46e29a26199fba40fb683b460a9399d15bbf548.png) I tested in the Windows machine with 7zip and it can uncompress the file but shows that there is an unexpected end-of-file and that there is a data error. Another colleague tried to open the netcdf files coming from different requests, one for CO2 and another CH4. In the methane case, she was successful to open it and plot something. In the other case, she received a netCDF HDF error. Apparently, the file is corrupted. There is a problem with the file compression process on the server side and this error is breaking our workflow to ingest the inversion-optimised product, as we use the Python `zipfile` package to automatise the decompression. In case the problem with the decompression is solved from our side, the integrity of the netCDF file is not assured. ---
**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\ **Post date:** [6 November 2024 10:31 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/3 "2024-11-06T10:31:01Z")
Hi Diego, Unfortunately we’ve been hit by a bug in an underlying library that has corrupted some of our dynamically constructed output files. It only affects files of certain sizes, hence why the majority of requests still work. We’re applying a fix now and you should find your request works again within an hour or two. Sorry for the inconvenience, Luke. ---
**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\ **Post date:** [6 November 2024 14:33 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/4 "2024-11-06T14:33:58Z")
Today’s release, which will contain the fix, is taking more time than usual I’m afraid. It should be applied by the end of the day though. ---
**Author:** ![Hugo\_M](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/h/a88e57/32.png) [@Hugo\_M](https://forum.ecmwf.int/u/Hugo_M)\ **Post date:** [6 November 2024 15:36 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/5 "2024-11-06T15:36:55Z")
Hello, I’m unable to open few netcdf files with panoply or python (xarray) even though I download them with the datastore. For exemple I can’t open the 2m temperature of April 2000. But it’s working for January 2000. Here is the panoply error message : There was an error opening the dataset: Unable to acquire dataset in either enhanced or unenhanced mode. I’d like to know if this has been resolved in today’s patch? ---
**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\ **Post date:** [6 November 2024 17:46 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/6 "2024-11-06T17:46:58Z")
Hi Hugo, The release is being rolled out right now. If your request doesn’t already give a valid file, it should do within the next hour. That is, if it’s caused by the same problem. Luke. ---
**Author:** ![Diego\_JCO](https://forum.ecmwf.int/user_avatar/forum.ecmwf.int/diego_jco/32/392_2.png) [@Diego\_JCO](https://forum.ecmwf.int/u/Diego_JCO)\ **Post date:** [7 November 2024 10:59 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/7 "2024-11-07T10:59:01Z")
Thanks, Today I tested the resulting file from a freshly made request and now it decompresses correctly. Thanks for the fast response. Cheers, Diego ---
**Author:** ![Sebastian\_Schunke](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/s/a587f6/32.png) [@Sebastian\_Schunke](https://forum.ecmwf.int/u/Sebastian_Schunke)\ **Post date:** [7 November 2024 14:56 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/8 "2024-11-07T14:56:43Z")
I have had similar issues with recently downloaded data and I am wondering, if I am affected by the same issue. I did notice, that my downloaded files appear to be in grib format, but trying to open them with xarray and cfgrib also raises errors about an unsupported Edition. Is that related, or another issue? ---
**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\ **Post date:** [8 November 2024 10:12 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474/9 "2024-11-08T10:12:31Z")
It affected all requests from any dataset from approximately Oct 30 10:00 UTC until Nov 6 17:00 UTC, so possibly. Files whose sizes were in certain very specific, narrow ranges may have been truncated. If you have an error opening a file and it was downloaded in this period, it’s worth downloading it again to see if this was the cause. Luke.