# Latest **URL:** https://forum.atmospherictoolbox.org/latest.md [Latest](https://forum.atmospherictoolbox.org/latest.md) · [Categories](https://forum.atmospherictoolbox.org/categories.md) · [Tags](https://forum.atmospherictoolbox.org/tags.md) --- ## [Welcome to Discourse](https://forum.atmospherictoolbox.org/t/welcome-to-discourse/7)
**Author:** [@system](https://forum.atmospherictoolbox.org/u/system)\ **Replies:** 0\ **Last updated:** [April 9, 2019, 1:38pm UTC](https://forum.atmospherictoolbox.org/t/welcome-to-discourse/7 "2019-04-09T13:38:56Z")
Discuss anything related to the Atmospheric Toolbox. From basic installation and usage to discussions on future developments. Although the forum is dedicated to discussions on the CODA, HARP, VISAN, and QDOAS software, … --- ## [HARP Support for new Sentinel-5 L2 data (not Sentinel-5P)](https://forum.atmospherictoolbox.org/t/harp-support-for-new-sentinel-5-l2-data-not-sentinel-5p/940)
**Author:** [@jamessill1978](https://forum.atmospherictoolbox.org/u/jamessill1978)\ **Replies:** 2\ **Last updated:** [July 2, 2026, 2:50pm UTC](https://forum.atmospherictoolbox.org/t/harp-support-for-new-sentinel-5-l2-data-not-sentinel-5p/940 "2026-07-02T14:50:53Z")
@sander.niemeijer , could you share any plans you have of HARP support for the new Sentinel-5 Level-2 data once it becomes available? From the initial documentation it appears that mostly the same Level-2 products will … --- ## [Harpmerge doesn't work anymore with TROPOMI SO2 L2](https://forum.atmospherictoolbox.org/t/harpmerge-doesnt-work-anymore-with-tropomi-so2-l2/938)
**Author:** [@nkadygrov](https://forum.atmospherictoolbox.org/u/nkadygrov)\ **Replies:** 2\ **Last updated:** [February 26, 2026, 4:24pm UTC](https://forum.atmospherictoolbox.org/t/harpmerge-doesnt-work-anymore-with-tropomi-so2-l2/938 "2026-02-26T16:24:17Z")
I was using harpmerge (1.29, conda installation) to create gridded netcdf files from L2 orbit data. In the end of 2025, the format of L2 data has been changed, and now I have error (when I tried to apply “SO2\_column\_num… --- ## [How to get attribute keys from a node?](https://forum.atmospherictoolbox.org/t/how-to-get-attribute-keys-from-a-node/937)
**Author:** [@Steven\_Compernolle](https://forum.atmospherictoolbox.org/u/Steven_Compernolle)\ **Replies:** 3\ **Last updated:** [February 23, 2026, 2:22pm UTC](https://forum.atmospherictoolbox.org/t/how-to-get-attribute-keys-from-a-node/937 "2026-02-23T14:22:19Z")
Is there a function that lists the attribute keys of a node? coda.get\_field\_names gives the node names below that node, but not the attributes. coda.get\_attributes seems to give the attribute values on the node, but … --- ## [How to apply e.g., '-1' in coda.fetch on S5P L2 products](https://forum.atmospherictoolbox.org/t/how-to-apply-e-g-1-in-coda-fetch-on-s5p-l2-products/936)
**Author:** [@Steven\_Compernolle](https://forum.atmospherictoolbox.org/u/Steven_Compernolle)\ **Replies:** 5\ **Last updated:** [January 16, 2026, 4:18pm UTC](https://forum.atmospherictoolbox.org/t/how-to-apply-e-g-1-in-coda-fetch-on-s5p-l2-products/936 "2026-01-16T16:18:27Z")
I was trying out coda.fetch on a S5P L2 file, following the documentation at CODA Python. Unfortunately I don’t fully grasp the documentation, especially the optional use of the integers and a bit the terminology. Would… --- ## [HARP operations](https://forum.atmospherictoolbox.org/t/harp-operations/934)
**Author:** [@panfount](https://forum.atmospherictoolbox.org/u/panfount)\ **Replies:** 1\ **Last updated:** [December 4, 2025, 4:14pm UTC](https://forum.atmospherictoolbox.org/t/harp-operations/934 "2025-12-04T16:14:28Z")
Hello!! I am using harp in the S5P/TROPOMI trajectory files, in order to keep from each file the data that are “inside” a circle area. To do so, I use the following command in the harp operations: point\_distance({lat},… --- ## [How to handle the Averaging kernel for regional scale](https://forum.atmospherictoolbox.org/t/how-to-handle-the-averaging-kernel-for-regional-scale/928)
**Author:** [@gezahegnsufaa](https://forum.atmospherictoolbox.org/u/gezahegnsufaa)\ **Replies:** 0\ **Last updated:** [September 19, 2025, 7:20am UTC](https://forum.atmospherictoolbox.org/t/how-to-handle-the-averaging-kernel-for-regional-scale/928 "2025-09-19T07:20:47Z")
Good morning Sander, I am currently trying to smooth EAC4, MOPITT, and IASI CO datasets with TROPOMI in order to make their total columns directly comparable, particularly over specific regions rather than just at indiv… --- ## [Request for HARP ingestion update: GOSAT XCO₂/XCH₄ and OCO-3 V11 support](https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927)
**Author:** [@ektf1147](https://forum.atmospherictoolbox.org/u/ektf1147)\ **Replies:** 1\ **Last updated:** [September 16, 2025, 7:45am UTC](https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927 "2025-09-16T07:45:04Z")
Thank you for maintaining and improving the HARP library. I would like to ask about two ingestion issues: GOSAT L2 products (GOSAT\_FTS\_L2\_CO2\_TC, GOSAT\_FTS\_L2\_CH4\_TC) Currently, HARP only ingests total column CO₂/CH₄ … --- ## [Harp grid gives unexpected results for GOME\_1](https://forum.atmospherictoolbox.org/t/harp-grid-gives-unexpected-results-for-gome-1/925)
**Author:** [@Klaus-Peter](https://forum.atmospherictoolbox.org/u/Klaus-Peter)\ **Replies:** 8\ **Last updated:** [September 11, 2025, 2:27pm UTC](https://forum.atmospherictoolbox.org/t/harp-grid-gives-unexpected-results-for-gome-1/925 "2025-09-11T14:27:13Z")
dear Sander, all, I tried to grid GOME\_1 (resolution 320km) data to 1°x° grid. The data were reprocessed with GODFIT and the import\_product works well. When I grid the data, I would expect that ~3 grid cells have the s… --- ## [Conversion to HARP required format](https://forum.atmospherictoolbox.org/t/conversion-to-harp-required-format/924)
**Author:** [@gezahegnsufaa](https://forum.atmospherictoolbox.org/u/gezahegnsufaa)\ **Replies:** 1\ **Last updated:** [September 1, 2025, 3:58pm UTC](https://forum.atmospherictoolbox.org/t/conversion-to-harp-required-format/924 "2025-09-01T15:58:08Z")
Hi Saander I tried to inspect the IASI product using harpdump IASI\_METOPA\_L2\_CO\_20190101\_ULB-LATMOS\_CDR\_V1.2.1.nc however, it returns ERROR: IASI\_METOPA\_L2\_CO\_20190101\_ULB-LATMOS\_CDR\_V1.2.1.nc: unsupported product t… --- ## [Collocating between EAC4 and Sentinel 5p CO product](https://forum.atmospherictoolbox.org/t/collocating-between-eac4-and-sentinel-5p-co-product/923)
**Author:** [@gezahegnsufaa](https://forum.atmospherictoolbox.org/u/gezahegnsufaa)\ **Replies:** 2\ **Last updated:** [August 30, 2025, 3:02pm UTC](https://forum.atmospherictoolbox.org/t/collocating-between-eac4-and-sentinel-5p-co-product/923 "2025-08-30T15:02:45Z")
Hi Sander, I am trying to bring multiple datasets into a similar format so that I can later compare partial and total columns of CO. The datasets I am working with are reported on different pressure levels and horizonta… --- ## [Sentinel 5p CO L2 product using HARP](https://forum.atmospherictoolbox.org/t/sentinel-5p-co-l2-product-using-harp/921)
**Author:** [@gezahegnsufaa](https://forum.atmospherictoolbox.org/u/gezahegnsufaa)\ **Replies:** 5\ **Last updated:** [August 27, 2025, 1:05pm UTC](https://forum.atmospherictoolbox.org/t/sentinel-5p-co-l2-product-using-harp/921 "2025-08-27T13:05:14Z")
Hi, I am matlab user. I would like to extract Sentinel 5p CO L2 product using HARP. I have been using with GEE L3 product but to make comparison with other dataset, co-location has to be performed. Can anyone tell me how… --- ## [Install on osx-arm64?](https://forum.atmospherictoolbox.org/t/install-on-osx-arm64/914)
**Author:** [@scottj](https://forum.atmospherictoolbox.org/u/scottj)\ **Replies:** 4\ **Last updated:** [August 25, 2025, 11:45am UTC](https://forum.atmospherictoolbox.org/t/install-on-osx-arm64/914 "2025-08-25T11:45:34Z")
Tried installing using anaconda but the package was not found. conda install -c conda-forge qdoas 2 channel Terms of Service accepted Channels: conda-forge stcorp-forge defaults Platform: osx-arm64 Collecting pack… --- ## [Request for Guidance on Adding .std Format Support to QDOAS v3.7.5](https://forum.atmospherictoolbox.org/t/request-for-guidance-on-adding-std-format-support-to-qdoas-v3-7-5/917)
**Author:** [@lggyyy](https://forum.atmospherictoolbox.org/u/lggyyy)\ **Replies:** 0\ **Last updated:** [August 17, 2025, 7:04am UTC](https://forum.atmospherictoolbox.org/t/request-for-guidance-on-adding-std-format-support-to-qdoas-v3-7-5/917 "2025-08-17T07:04:53Z")
We’ve identified that the current v3.7.5 implementation of doas\_cl lacks native support for our organization’s .std spectral file format.What should I do to modify version 3.7.5 to support .std spectral file format.? --- ## [Compile qdoas version 3.4](https://forum.atmospherictoolbox.org/t/compile-qdoas-version-3-4/916)
**Author:** [@lggyyy](https://forum.atmospherictoolbox.org/u/lggyyy)\ **Replies:** 0\ **Last updated:** [August 12, 2025, 3:40am UTC](https://forum.atmospherictoolbox.org/t/compile-qdoas-version-3-4/916 "2025-08-12T03:40:34Z")
Has anyone successfully compiled version 3.4 of qdoas on Windows? Could you teach me how to compile it?I’m currently attempting to compile it using MINGW64 within MSYS2, but it’s failing. --- ## [Doas\_cl v3.7.5 Produces 0KB .asc File with -c "config.xml" (Regression from v3.4)](https://forum.atmospherictoolbox.org/t/doas-cl-v3-7-5-produces-0kb-asc-file-with-c-config-xml-regression-from-v3-4/911)
**Author:** [@lggyyy](https://forum.atmospherictoolbox.org/u/lggyyy)\ **Replies:** 1\ **Last updated:** [July 18, 2025, 7:25am UTC](https://forum.atmospherictoolbox.org/t/doas-cl-v3-7-5-produces-0kb-asc-file-with-c-config-xml-regression-from-v3-4/911 "2025-07-18T07:25:12Z")
After upgrading doas\_cl from v3.4 to v3.7.5, I’m encountering a critical issue where the command: doas\_cl -c “config.xml” fails to generate valid output. While this command works correctly in v3.4 (producing a non-empt… --- ## [How to install QDOAS on Windows](https://forum.atmospherictoolbox.org/t/how-to-install-qdoas-on-windows/909)
**Author:** [@FRANK-tik](https://forum.atmospherictoolbox.org/u/FRANK-tik)\ **Replies:** 4\ **Last updated:** [July 4, 2025, 10:44am UTC](https://forum.atmospherictoolbox.org/t/how-to-install-qdoas-on-windows/909 "2025-07-04T10:44:24Z")
Dear Sir, Cannot find installation package on official website After visiting the QDOAS official website (GitHub - UVVIS-BIRA-IASB/qdoas: Application to perform DOAS retrievals of trace gases from spectral measurements)… --- ## [Typo in EarthCARE MSI AOD names?](https://forum.atmospherictoolbox.org/t/typo-in-earthcare-msi-aod-names/906)
**Author:** [@kerstin](https://forum.atmospherictoolbox.org/u/kerstin)\ **Replies:** 1\ **Last updated:** [June 21, 2025, 4:42pm UTC](https://forum.atmospherictoolbox.org/t/typo-in-earthcare-msi-aod-names/906 "2025-06-21T16:42:34Z")
Hi, I run harp 1.23 on windows & import ECA\_EXAC\_MSI\_AOT\_2A\_20250501T001112Z\_20250501T013452Z\_05244F.h5 It looks like there is a typo: aorosol (instead of aerosol…) float aorosol\_optical\_depth float aorosol\_optical\_d… --- ## [Keeping S5P SO2 L2 measurement time for bin\_spatial](https://forum.atmospherictoolbox.org/t/keeping-s5p-so2-l2-measurement-time-for-bin-spatial/563)
**Author:** [@benjaminesse](https://forum.atmospherictoolbox.org/u/benjaminesse)\ **Replies:** 6\ **Last updated:** [April 16, 2025, 8:21am UTC](https://forum.atmospherictoolbox.org/t/keeping-s5p-so2-l2-measurement-time-for-bin-spatial/563 "2025-04-16T08:21:27Z")
I am trying to ingest and regrid S5P SO2 products using bin\_spatial. This works great, but I also need the measurement time for each grid point. I can’t figure out how to propagate this through to the final HARP product,… --- ## [Curious harpmerge issue with gridded data](https://forum.atmospherictoolbox.org/t/curious-harpmerge-issue-with-gridded-data/901)
**Author:** [@mariliza](https://forum.atmospherictoolbox.org/u/mariliza)\ **Replies:** 2\ **Last updated:** [April 4, 2025, 1:29pm UTC](https://forum.atmospherictoolbox.org/t/curious-harpmerge-issue-with-gridded-data/901 "2025-04-04T13:29:09Z")
Good morning Sander, I am running python 3.11.7 with harp 1.23 on the operational EUMETSAT IASI data on our HPC system, linux. For the EUMETSAT ACSAF project. I am creating daily gridded files \[how original.\] However,… --- ## [Extracting surface level data from TROPOMI Tropospheric column using HARP](https://forum.atmospherictoolbox.org/t/extracting-surface-level-data-from-tropomi-tropospheric-column-using-harp/900)
**Author:** [@Nad24](https://forum.atmospherictoolbox.org/u/Nad24)\ **Replies:** 4\ **Last updated:** [March 29, 2025, 6:00am UTC](https://forum.atmospherictoolbox.org/t/extracting-surface-level-data-from-tropomi-tropospheric-column-using-harp/900 "2025-03-29T06:00:08Z")
Hello everyone, I’m working with TROPOMI data (CH4) and I need to extract only the surface level data from the full tropospheric column information available in the Level 2 files. Is there a HARP operation or a combinat… --- ## [Deriving area while using bin\_spatial](https://forum.atmospherictoolbox.org/t/deriving-area-while-using-bin-spatial/898)
**Author:** [@jawi289o](https://forum.atmospherictoolbox.org/u/jawi289o)\ **Replies:** 7\ **Last updated:** [March 25, 2025, 10:52am UTC](https://forum.atmospherictoolbox.org/t/deriving-area-while-using-bin-spatial/898 "2025-03-25T10:52:43Z")
@sander.niemeijer I am using bin\_spatial to regrid the data to approximately 1 km by 1 km. However, the issue I am facing is that I am unable to derive the area. I want to obtain the final result as a GeoDataFrame with … --- ## [Normalization of the reference spectrum?](https://forum.atmospherictoolbox.org/t/normalization-of-the-reference-spectrum/899)
**Author:** [@xnick](https://forum.atmospherictoolbox.org/u/xnick)\ **Replies:** 3\ **Last updated:** [March 24, 2025, 1:25pm UTC](https://forum.atmospherictoolbox.org/t/normalization-of-the-reference-spectrum/899 "2025-03-24T13:25:53Z")
Hello. A question arised while discussing with some colleagues about wether or not different normalization schemes for the reference spectrum would affect the analysis. More specifically, if our reference spectrum is co… --- ## [Extract and save a subset region from TROPOMI L1B data into a smaller NetCDF file](https://forum.atmospherictoolbox.org/t/extract-and-save-a-subset-region-from-tropomi-l1b-data-into-a-smaller-netcdf-file/897)
**Author:** [@angel](https://forum.atmospherictoolbox.org/u/angel)\ **Replies:** 1\ **Last updated:** [March 19, 2025, 1:19pm UTC](https://forum.atmospherictoolbox.org/t/extract-and-save-a-subset-region-from-tropomi-l1b-data-into-a-smaller-netcdf-file/897 "2025-03-19T13:19:15Z")
Hello, I am currently working with large TROPOMI Level-1B radiance files (.nc format), each around 3.5 GB. These files contain global data covering an entire orbit, but I only need data within a specific geographic regi… --- ## [Add markers to avl.Geo plot?](https://forum.atmospherictoolbox.org/t/add-markers-to-avl-geo-plot/895)
**Author:** [@Steven\_Compernolle](https://forum.atmospherictoolbox.org/u/Steven_Compernolle)\ **Replies:** 2\ **Last updated:** [March 19, 2025, 11:47am UTC](https://forum.atmospherictoolbox.org/t/add-markers-to-avl-geo-plot/895 "2025-03-19T11:47:26Z")
Is it possible, within python, to add markers (e.g., station locations) to a avl.Geo plot ? --- ## [Export data after pre-processing](https://forum.atmospherictoolbox.org/t/export-data-after-pre-processing/893)
**Author:** [@jawi289o](https://forum.atmospherictoolbox.org/u/jawi289o)\ **Replies:** 4\ **Last updated:** [March 19, 2025, 9:07am UTC](https://forum.atmospherictoolbox.org/t/export-data-after-pre-processing/893 "2025-03-19T09:07:28Z")
I have downloaded bulk data of Sentinel-5P pollutants and now I am performing the pre-processing operations using HARP. My requirement is to save each files in tiff format for my area of interest (already have shp file).… --- ## [GOME2 SO2 SCD error in coda.fetch ingestion](https://forum.atmospherictoolbox.org/t/gome2-so2-scd-error-in-coda-fetch-ingestion/894)
**Author:** [@mariliza](https://forum.atmospherictoolbox.org/u/mariliza)\ **Replies:** 2\ **Last updated:** [March 18, 2025, 1:18pm UTC](https://forum.atmospherictoolbox.org/t/gome2-so2-scd-error-in-coda-fetch-ingestion/894 "2025-03-18T13:18:11Z")
Greetings Sander, I am trying to ingest a GOME-2A file GOME\_O3-SO2\_L2\_20190623230357\_050\_METOPA\_65782\_DLR\_03.HDF5 using the following: product = harp.import\_product(ffile, options = 'detailed\_results=SO2;… --- ## [Issue with point distance operation](https://forum.atmospherictoolbox.org/t/issue-with-point-distance-operation/884)
**Author:** [@mariliza](https://forum.atmospherictoolbox.org/u/mariliza)\ **Replies:** 2\ **Last updated:** [February 26, 2025, 4:28pm UTC](https://forum.atmospherictoolbox.org/t/issue-with-point-distance-operation/884 "2025-02-26T16:28:15Z")
netcdf IASI\_o3\_subcolumn\_IASI-B\_20140826 { dimensions: time = 15 ; latitude = 788 ; longitude = 120 ; vertical = 2 ; spectral = 3 ; variables: double latitude(time, latitude, longitude) ; latitude:units = “degre… --- ## [Building with visual studio](https://forum.atmospherictoolbox.org/t/building-with-visual-studio/882)
**Author:** [@thomasd](https://forum.atmospherictoolbox.org/u/thomasd)\ **Replies:** 2\ **Last updated:** [January 31, 2025, 2:59pm UTC](https://forum.atmospherictoolbox.org/t/building-with-visual-studio/882 "2025-01-31T14:59:32Z")
I’d like to create a vcpkg (vcpkg - Open source C/C++ dependency manager from Microsoft) port for CODA, and therefore want to build the library using CMake and MSVC. I run into one issue: the CODA CMakeLists uses “find\_… --- ## [TROPOMI CHOCHO PAL data | ingest 3D variable with coda](https://forum.atmospherictoolbox.org/t/tropomi-chocho-pal-data-ingest-3d-variable-with-coda/864)
**Author:** [@mariliza](https://forum.atmospherictoolbox.org/u/mariliza)\ **Replies:** 7\ **Last updated:** [January 20, 2025, 6:43am UTC](https://forum.atmospherictoolbox.org/t/tropomi-chocho-pal-data-ingest-3d-variable-with-coda/864 "2025-01-20T06:43:48Z")
Good morning Sander, In the ingestion file for the S5P PAL product of CHOCHO, the fitted slant columns are not included. While it is not an official recommendation for the product, some the SCDs should be used to filter… [Next page](https://forum.atmospherictoolbox.org/latest.md?page=1)