# \#file\_format **URL:** https://forum.ecmwf.int/tag/file-format/62.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [📢 ESiWACE3 Data compression hackathon](https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 1\ **Last updated:** [16 July 2026 15:44 UTC](https://forum.ecmwf.int/t/esiwace3-data-compression-hackathon/14846 "2026-07-16T15:44:16Z")
Event date: 15-17 September 2026 Location: Bonn, Germany Attendance: Hybrid Registration deadline for in-person attendance: 31-07-2026 Registration deadline for online attendance: 31-08-2026 We are excited to a… --- ## [NaN values in Solar Surface Radiation Downwards](https://forum.ecmwf.int/t/nan-values-in-solar-surface-radiation-downwards/1474)
**Author:** [@Frank\_DeMarco](https://forum.ecmwf.int/u/Frank_DeMarco)\ **Replies:** 6\ **Last updated:** [8 July 2026 09:54 UTC](https://forum.ecmwf.int/t/nan-values-in-solar-surface-radiation-downwards/1474 "2026-07-08T09:54:14Z")
I'm reading some NaN values for ERA5-Land Solar Surface Radiation Downwards on 2018/08/27 at location (32.3, -86.9) from 0 - 6 hours. I think I downloaded this data previously and and it did not contain NaN values, so I… --- ## [Sort timesteps in GRIB file in ascending order](https://forum.ecmwf.int/t/sort-timesteps-in-grib-file-in-ascending-order/1652)
**Author:** [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\ **Replies:** 0\ **Last updated:** [2 March 2023 16:47 UTC](https://forum.ecmwf.int/t/sort-timesteps-in-grib-file-in-ascending-order/1652 "2023-03-02T16:47:41Z")
Sometimes the grib records in a file may not be sorted into the correct time order. You can use ecCodes to sort the grib records into ascending time order: grib\_copy -B "date asc, time:i asc, step:i asc, level:i asc" i… --- ## [Mismatch between instantaneous and accumulations validity time](https://forum.ecmwf.int/t/mismatch-between-instantaneous-and-accumulations-validity-time/1024)
**Author:** [@Taina\_Martins](https://forum.ecmwf.int/u/Taina_Martins)\ **Replies:** 4\ **Last updated:** [8 August 2022 13:49 UTC](https://forum.ecmwf.int/t/mismatch-between-instantaneous-and-accumulations-validity-time/1024 "2022-08-08T13:49:28Z")
Dear all, I'm part of a team which is using ERA5 data to estimate the power production of wind and solar plants. To do that, we use U and V wind components, surface temperature, and radiation (SSRD and TISR). While win… --- ## [Unexpected coordinates - CAMS global forecast from CDS with restricted area](https://forum.ecmwf.int/t/unexpected-coordinates-cams-global-forecast-from-cds-with-restricted-area/1063)
**Author:** [@Shaked\_Friedman](https://forum.ecmwf.int/u/Shaked_Friedman)\ **Replies:** 2\ **Last updated:** [31 July 2022 08:21 UTC](https://forum.ecmwf.int/t/unexpected-coordinates-cams-global-forecast-from-cds-with-restricted-area/1063 "2022-07-31T08:21:40Z")
I used the CDS app web interface to fetch CAMS global forecast data, but the data I got was on a grid which didn't match what I expected. It seems that the new data I got from CDS was for some reason shifted so that the… --- ## [What is dimension 'step' in dataset after a query to ERA5-Land monthly averaged data from 1950 to present](https://forum.ecmwf.int/t/what-is-dimension-step-in-dataset-after-a-query-to-era5-land-monthly-averaged-data-from-1950-to-present/1645)
**Author:** [@Markus\_Kaukonen](https://forum.ecmwf.int/u/Markus_Kaukonen)\ **Replies:** 0\ **Last updated:** [28 June 2022 12:38 UTC](https://forum.ecmwf.int/t/what-is-dimension-step-in-dataset-after-a-query-to-era5-land-monthly-averaged-data-from-1950-to-present/1645 "2022-06-28T12:38:51Z")
The python script produces a xarray dataset with dimensions Data variables: u10 (time, step, latitude, longitude) float32 ... v10 (time, step, latitude, longitude) float32 ... sp (time… --- ## [Open/read ERA5 reanalysis data in ascii format inside IDL V6.2 in windows system](https://forum.ecmwf.int/t/open-read-era5-reanalysis-data-in-ascii-format-inside-idl-v6-2-in-windows-system/1480)
**Author:** [@Khaled\_Megahed](https://forum.ecmwf.int/u/Khaled_Megahed)\ **Replies:** 2\ **Last updated:** [11 March 2022 08:23 UTC](https://forum.ecmwf.int/t/open-read-era5-reanalysis-data-in-ascii-format-inside-idl-v6-2-in-windows-system/1480 "2022-03-11T08:23:13Z")
Dear all, I had downloaded a netcdf ERA5 reanalysis data from the ECMWF. I made some attempt to open/read such this file inside IDL V6.2 under windows system. Unfortunately, I failed. I will be appreciate any one help … --- ## [Open/read ERA5 reanalysis file in ascii format inside IDL6.2 in windows system](https://forum.ecmwf.int/t/open-read-era5-reanalysis-file-in-ascii-format-inside-idl6-2-in-windows-system/1165)
**Author:** [@Khaled\_Megahed](https://forum.ecmwf.int/u/Khaled_Megahed)\ **Replies:** 0\ **Last updated:** [9 March 2022 21:21 UTC](https://forum.ecmwf.int/t/open-read-era5-reanalysis-file-in-ascii-format-inside-idl6-2-in-windows-system/1165 "2022-03-09T21:21:03Z")
Dear all, I had downloaded a netcdf ERA5 reanalysis data from the ECMWF. I made some attempt to open/read such this file inside IDL V6.2 under windows system. Unfortunately, I failed. I will be appreciate any one help… --- ## [CAMS global emission inventories - change to downloaded filenames](https://forum.ecmwf.int/t/cams-global-emission-inventories-change-to-downloaded-filenames/997)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [6 July 2021 10:58 UTC](https://forum.ecmwf.int/t/cams-global-emission-inventories-change-to-downloaded-filenames/997 "2021-07-06T10:58:20Z")
We would like to inform you that a change in the filenames for the CAMS global emission inventories has been implemented on the Atmosphere Data Store (ADS). The species are now labelled in the filenames as in the follo… --- ## [Saving to multiple files](https://forum.ecmwf.int/t/saving-to-multiple-files/1160)
**Author:** [@Ariel\_Goerl](https://forum.ecmwf.int/u/Ariel_Goerl)\ **Replies:** 2\ **Last updated:** [20 June 2021 01:39 UTC](https://forum.ecmwf.int/t/saving-to-multiple-files/1160 "2021-06-20T01:39:57Z")
I am using the API to download model-level data and would like to programmatically save to separate files (e.g., one for each month). When I submit a text file containing multiple requests, however, only the first one is… --- ## [Time issue when using CAMS European Air Quality forecast netCDF data in ArcGIS](https://forum.ecmwf.int/t/time-issue-when-using-cams-european-air-quality-forecast-netcdf-data-in-arcgis/1564)
**Author:** [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\ **Replies:** 0\ **Last updated:** [19 March 2021 17:58 UTC](https://forum.ecmwf.int/t/time-issue-when-using-cams-european-air-quality-forecast-netcdf-data-in-arcgis/1564 "2021-03-19T17:58:34Z")
When using netCDF files from CAMS European Air Quality forecasts from the ADS in ArcGIS, the 'time' values may not be displayed correctly. In netCDF files which follow the CF conventions the 'time' variable is normall… --- ## [Differences between data access methods and file formats](https://forum.ecmwf.int/t/differences-between-data-access-methods-and-file-formats/927)
**Author:** [@mbacou](https://forum.ecmwf.int/u/mbacou)\ **Replies:** 4\ **Last updated:** [11 January 2021 15:04 UTC](https://forum.ecmwf.int/t/differences-between-data-access-methods-and-file-formats/927 "2021-01-11T15:04:15Z")
We're looking at ERA5-LAND 2m-temperature, but can't explain differences between GRIB and NetCDF files downloaded at https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-land?tab=form with another NetCDF fi… --- ## [Seasonal Forecast monthly data - ensemble numbering?](https://forum.ecmwf.int/t/seasonal-forecast-monthly-data-ensemble-numbering/1137)
**Author:** [@Kevin\_Marsh](https://forum.ecmwf.int/u/Kevin_Marsh)\ **Replies:** 4\ **Last updated:** [15 January 2020 11:16 UTC](https://forum.ecmwf.int/t/seasonal-forecast-monthly-data-ensemble-numbering/1137 "2020-01-15T11:16:05Z")
When i download data from the monthly seasonal forecast dataset at: https://cds.climate.copernicus.eu/cdsapp#!/dataset/seasonal-monthly-single-levels?tab=form e.g. Then for each lead time month I have 28 member… --- ## [ECMWF seasonal forecasts - GRIB/NETCDF and ensemble format](https://forum.ecmwf.int/t/ecmwf-seasonal-forecasts-grib-netcdf-and-ensemble-format/856)
**Author:** [@Richard\_Dixon1](https://forum.ecmwf.int/u/Richard_Dixon1)\ **Replies:** 1\ **Last updated:** [25 October 2019 14:12 UTC](https://forum.ecmwf.int/t/ecmwf-seasonal-forecasts-grib-netcdf-and-ensemble-format/856 "2019-10-25T14:12:04Z")
Hoping someone can help - I've downloaded one of the C3S seasonal forecasts: a September forecast with all the ensembles and all the timesteps for one specific field. When I convert the grib format to netcdf using CDO, …