![NASA/GEOS-CF/v2/fcst/htf](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_GEOS-CF_v2_fcst_htf_sample.png) Dataset Availability : 2025-08-04T00:00:00Z--2026-11-09T09:00:00Z Dataset Producer : [NASA / GMAO](https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) Tags : [atmosphere](https://developers.google.com/earth-engine/datasets/tags/atmosphere.md.txt) [composition](https://developers.google.com/earth-engine/datasets/tags/composition.md.txt) [forecast](https://developers.google.com/earth-engine/datasets/tags/forecast.md.txt) [geos](https://developers.google.com/earth-engine/datasets/tags/geos.md.txt) [geos-cf](https://developers.google.com/earth-engine/datasets/tags/geos-cf.md.txt) [gmao](https://developers.google.com/earth-engine/datasets/tags/gmao.md.txt) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa.md.txt) #### Description This dataset contains forecast (fcst) of high-temporal frequency data (htf) at 15 minute intervals. It is created from the original GEOS-CF collection htf_inst_15mn_glo_L1440x721_slv. Use the 'creation_time' and 'forecast_time' properties to select data of interest. The Goddard Earth Observing System Composition Forecast (GEOS-CF) system is a global constituent prediction system from NASA's [Global Modeling and Assimilation Office(GMAO)](https://gmao.gsfc.nasa.gov/). GEOS-CF offers a tool for atmospheric chemistry research, with the goal to supplement NASA's broad range of space-based and in-situ observations. GEOS-CF expands on the GEOS weather and aerosol modeling system by introducing the [GEOS-Chem](http://wiki.seas.harvard.edu/geos-chem/) chemistry module to provide hindcasts and 5-days forecasts of atmospheric constituents including ozone (O~3~), carbon monoxide (CO), nitrogen dioxide (NO~2~), sulfur dioxide (SO~2~), coarse particulate matter (PM~10~), and fine particulate matter (PM~2.5~). The chemistry module integrated in GEOS-CF is identical to the offline GEOS-Chem model and readily benefits from the innovations provided by the GEOS-Chem community. Outputs are provided globally at 0.25° horizontal resolution. Please refer to the [GEOS-CF Product Page](https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) for more details. In October 2025, a major update to the GEOS-CF system was introduced as GEOS-CF v2. This change included updates to the GEOS atmospheric general circulation model and the GEOS-Chem chemical model, replaying meteorology to [GEOS IT](https://gmao.gsfc.nasa.gov/gmao-products/geos-it/), direct assimilation of stratospheric profiles and column ozone from NASA Aura OMI and MLS instruments, and updates to the anthropogenic emission source. Evaluation of these updates is ongoing; results will be added into this description as they become available. [Preliminary results](https://gmao.gsfc.nasa.gov/science-snapshots/improved-atmospheric-composition-forecasting-in-geos-cf-version-2/) suggest that, in relation to GEOS-CF v1, GEOS-CF v2 dramatically improves the representation of PM~2.5~ and SO~2~ near the surface. Representations of O~3~ and NO~2~ are generally improved throughout most of the atmospheric column, with and NO~2~ being substantially lower in GEOS-CF v2 compared with v1. While representation of near-surface O~3~ is improved compared to GEOS-CF v1, there remain high biases compared with ozone monitor data from the US Environmental Protection Agency. Users of GEOS-CF are encouraged to treat outputs from the original system (v1) and the new system (v2) separately in their analysis, due to the extensive changes between the systems. ### Bands **Bands** Pixel size: 27750 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---| | `CO` | Mol fraction | 27750 meters | Carbon monoxide (CO, MW = 28.01 g mol-1) mole fraction in dry air | | `NO2` | Mol fraction | 27750 meters | Nitrogen dioxide (NO2, MW = 46.01 g mol-1) mole fraction in dry air | | `O3` | Mol fraction | 27750 meters | Ozone (O3, MW = 48.0 g mol-1) volume mixing ratio dry air | | `PM25_RH35` | μg/m³ | 27750 meters | Particulate matter with diameter below 2.5 um mass at RH 35% (includes water) mass concentration in dry air | | `SLP` | Pa | 27750 meters | Sea level pressure | | `SO2` | Mol fraction | 27750 meters | Sulfur dioxide (SO2, MW = 64.04 g mol-1) mole fraction in dry air | | `U` | m/s | 27750 meters | Eastward wind | | `V` | m/s | 27750 meters | Northward wind | ### Image Properties **Image Properties** | Name | Type | Description | |---|---|---| | creation_time | DOUBLE | Time of creation | | forecast_time | DOUBLE | Forecast time | ### Terms of Use **Terms of Use** Unless otherwise noted, all NASA-produced data may be used for any purpose without prior permission. For more information and exceptions visit the [NASA Data \& Information Policy page](https://earthdata.nasa.gov/collaborate/open-data-services-and-software/data-information-policy). ### Citations Citations: - Keller, C. A., Knowland, K. E., Duncan, B. N., Liu, J., Anderson, D. C., Das, S., ... \& Pawson, S. (2021). Description of the NASA GEOS composition forecast modeling system GEOS-CF v1.0. Journal of Advances in Modeling Earth Systems, 13(4), e2020MS002413. [doi:10.1029/2020MS002413](https://doi.org/10.1029/2020MS002413) Knowland, K. E., Keller, C. A., Wales, P. A., Wargan, K., Coy, L., Johnson, M.S., ... \& Pawson, S. (2022). NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0: Stratospheric Composition. Journal of Advances in Modeling Earth Systems, 14, e2021MS002852. [doi:10.1029/2021MS002852](https://doi.org/10.1029/2021MS002852) > [!NOTE] > **Note:** these citations refer to the original GEOS-CF (v1) system; citations describing the new (v2) system will be added following publication. ### DOIs - ### Explore with Earth Engine > [!NOTE] > **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) ### Code Editor (JavaScript) ```javascript var imageVisParamNO2 = { 'bands': ['NO2'], 'min': 6.96e-11, 'max': 4.42e-8, }; var geosCf = ee.ImageCollection('NASA/GEOS-CF/v2/fcst/htf'); Map.setCenter(100, 20, 3); var NO2 = ee.Image('NASA/GEOS-CF/v2/fcst/htf/20260101_09z-20260101_0930z'); Map.addLayer(NO2, imageVisParamNO2, 'NO2', true, 1); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GEOS-CF_v2_fcst_htf) [GEOS-CF fcst htf v2: Goddard Earth Observing System Composition Forecast](https://developers.google.com/earth-engine/datasets/catalog/NASA_GEOS-CF_v2_fcst_htf.md.txt) This dataset contains forecast (fcst) of high-temporal frequency data (htf) at 15 minute intervals. It is created from the original GEOS-CF collection htf_inst_15mn_glo_L1440x721_slv. Use the 'creation_time' and 'forecast_time' properties to select data of interest. The Goddard Earth Observing System Composition Forecast (GEOS-CF) system is a global constituent prediction system from ... NASA/GEOS-CF/v2/fcst/htf, atmosphere,composition,forecast,geos,geos-cf,gmao,nasa 2025-08-04T00:00:00Z/2026-11-09T09:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.1029/2020MS002413](https://doi.org/https://gmao.gsfc.nasa.gov/gmao-products/geos-cf/) - [https://doi.org/10.1029/2020MS002413](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GEOS-CF_v2_fcst_htf)