![TOMS/MERGED_V4](https://developers.google.com/earth-engine/datasets/images/TOMS/TOMS_MERGED_V4_sample.png) Dataset Availability : 1978-11-01T00:00:00Z--2026-11-08T00:00:00Z Dataset Producer : [NASA / GES DISC](https://disc.gsfc.nasa.gov/information?page=1&keywords=acdisc) Cadence : 1 Day Tags : [atmosphere](https://developers.google.com/earth-engine/datasets/tags/atmosphere.md.txt) [climate](https://developers.google.com/earth-engine/datasets/tags/climate.md.txt) [geophysical](https://developers.google.com/earth-engine/datasets/tags/geophysical.md.txt) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa.md.txt) [ozone](https://developers.google.com/earth-engine/datasets/tags/ozone.md.txt) [weather-and-climate](https://developers.google.com/earth-engine/datasets/tags/weather-and-climate.md.txt) aura ges-disc goddard omi toms #### Description The Total Ozone Mapping Spectrometer (TOMS) data represent the primary long-term, continuous record of satellite-based observations available for use in monitoring global and regional trends in total ozone over the past 25 years. The data are produced by the Laboratory for Atmospheres at NASA's Goddard Space Flight Center. Version 8 TOMS data products include level 3 gridded data (1.0 x 1.25 deg). The Ozone Monitoring Instrument (OMI), aboard the Aura satellite (July 2004 - current), has a higher resolution (1.0 x 1.0 deg). These data represent a merged ozone product from TOMS/EarthProbe, TOMS/Nimbus-7, TOMS/Meteor-3, OMI/Aura and USGS-interpolated data for dates with no data. See [this document](https://acd-ext.gsfc.nasa.gov/anonftp/toms/omi/Changes_OMI_TO3_col4_col3.pdf) for a summary of changes between v3 and v4. [Additional TOMS and OMI information](https://ozoneaq.gsfc.nasa.gov/missions/) ### Bands **Bands** Pixel size: 111000 meters (all bands) | Name | Units | Min | Max | Pixel Size | Description | |---|---|---|---|---|---| | `ozone` | Dobson | 73\* | 983\* | 111000 meters | Total column ozone | \* estimated min or max value ### Terms of Use **Terms of Use** Distribution of data from the Goddard Earth Sciences Data and Information Services Center (GES DISC) is funded by NASA's Science Mission Directorate (SMD). Consistent with NASA [Earth Science Data and Information Policy](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-information-policy/), data from the GES DISC archive are available free to the user community. For more information visit the GES DISC [Data Policy](https://disc.sci.gsfc.nasa.gov/citing) page. ### Citations Citations: - The data set source should be properly cited when the data are used. A formal reference of the form: \, 2012, last updated 2013: \. NASA/GSFC, Greenbelt, MD, USA, NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). Accessed \ at \ is suggested following Parsons et al. (2010), [doi:10.1029/2010EO340001](https://doi.org/10.1029/2010EO340001) ### 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 dataset = ee.ImageCollection('TOMS/MERGED_V4') .filter(ee.Filter.date('2018-08-01', '2018-08-10')); var columnOzone = dataset.select('ozone'); var columnOzoneVis = { min: 100, max: 500, palette: ['1621a2', 'cyan', 'green', 'yellow', 'orange', 'red'], }; Map.setCenter(6.75, 46.53, 2); Map.addLayer(columnOzone, columnOzoneVis, 'Column Ozone'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/TOMS/TOMS_MERGED_V4) [TOMS and OMI Merged Ozone Data v4](https://developers.google.com/earth-engine/datasets/catalog/TOMS_MERGED_V4.md.txt) The Total Ozone Mapping Spectrometer (TOMS) data represent the primary long-term, continuous record of satellite-based observations available for use in monitoring global and regional trends in total ozone over the past 25 years. The data are produced by the Laboratory for Atmospheres at NASA's Goddard Space Flight Center. Version 8 ... TOMS/MERGED_V4, atmosphere,climate,geophysical,nasa,ozone,weather-and-climate 1978-11-01T00:00:00Z/2026-11-08T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [](https://doi.org/https://disc.gsfc.nasa.gov/information?page=1&keywords=acdisc) - [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/TOMS_MERGED_V4)