# Request for HARP ingestion update: GOSAT XCO₂/XCH₄ and OCO-3 V11 support

**URL:** https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927
**Category:** HARP
**Tags:** python
**Created:** [September 16, 2025, 5:35am UTC](https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927 "2025-09-16T05:35:02Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ektf1147](https://forum.atmospherictoolbox.org/user_avatar/forum.atmospherictoolbox.org/ektf1147/32/411_2.png) [@ektf1147](https://forum.atmospherictoolbox.org/u/ektf1147)
#### Post date: [September 16, 2025, 5:35am UTC](https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927/1 "2025-09-16T05:35:02Z")

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Thank you for maintaining and improving the HARP library. I would like to ask about two ingestion issues:

1. **GOSAT L2 products (GOSAT\_FTS\_L2\_CO2\_TC, GOSAT\_FTS\_L2\_CH4\_TC)**  
Currently, HARP only ingests _total column_ CO₂/CH₄ (`CO2_column_number_density`, `CH4_column_number_density`).  
However, most users are primarily interested in the _bias-corrected column-averaged dry air mole fractions_, i.e. **XCO₂ and XCH₄**.  
These variables are already present in the product files at:

- `Data/mixingRatio/XCO2BiasCorrected`
- `Data/mixingRatio/XCH4BiasCorrected`  
Would it be possible to update the ingestion module to expose these variables directly (similar to how OCO-2 ingestion provides XCO₂)?

1. **OCO-3 product versions (OCO\_OCO3\_LtCO2)**  
HARP ingestion seems to support OCO-3 up to **version V10**.  
The current product version is **V11** , and V10 is no longer produced.  
Could you please add support for OCO-3 V11 in a future release? This would be very helpful, since new data are only available in V11.

These two updates would greatly improve the usability of HARP for the CO₂ community.

Thank you very much for your consideration.

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### Author: ![sander.niemeijer](https://forum.atmospherictoolbox.org/user_avatar/forum.atmospherictoolbox.org/sander.niemeijer/32/5_2.png) [@sander.niemeijer](https://forum.atmospherictoolbox.org/u/sander.niemeijer)
#### Post date: [September 16, 2025, 7:45am UTC](https://forum.atmospherictoolbox.org/t/request-for-harp-ingestion-update-gosat-xco-xch-and-oco-3-v11-support/927/2 "2025-09-16T07:45:04Z")

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Yes. We can implement this.  
I can’t commit to a timeline yet, since it is a busy period. But it will come.