- Dataset Availability
- 2023-08-01T00:00:00Z–2025-08-13T12:43:01Z
- Dataset Provider
- QA Filtered: Google and NASA ASDC
- Tags
Description
Formaldehyde Level 3 collection provides trace gas information on a regular grid covering the TEMPO field of regard for nominal TEMPO observations. Level 3 files are derived by combining information from all Level 2 files constituting a TEMPO East-West scan cycle. The rasters contain information on formaldehyde vertical columns, ancillary data used in air mass factor calculations and reference sector or de-striping corrections, and retrieval quality flags. The re-gridding algorithm uses an area-weighted approach.
The QA Filtered TEMPO HCHO L3 dataset is a quality-controlled version of the original data. It is generated by removing data points with high cloud cover (>50%), extreme solar zenith angle (>80 degrees), and main data quality (flag > 0).
- A version of this dataset without QA filters applied is available as NASA/TEMPO/HCHO_L3
- General Documentation
Bands
Pixel Size
2226 meters
Bands
| Name | Units | Pixel Size | Description |
|---|---|---|---|
weight |
km^2 | meters | Sum of Level 2 pixel overlap areas. Represents the weighting factor for each grid cell, indicating the fraction of the grid cell area with valid data. |
vertical_column |
molecules/cm^2 | meters | HCHO vertical column |
vertical_column_uncertainty |
molecules/cm^2 | meters | HCHO vertical column uncertainty |
main_data_quality_flag |
Dimensionless | meters | Main data quality flag which is always 0, indicating good quality data. |
num_vertical_column_samples |
Dimensionless | meters | Number of vertical column samples |
min_vertical_column_sample |
molecules/cm^2 | meters | Smallest vertical column sample |
max_vertical_column_sample |
molecules/cm^2 | meters | Largest vertical column sample |
solar_zenith_angle |
deg | meters | Data is filtered to include only observations with solar zenith angle less than or equal to 80 degrees. |
viewing_zenith_angle |
deg | meters | Viewing zenith angle at pixel center |
relative_azimuth_angle |
deg | meters | Relative azimuth angle at pixel center |
surface_pressure |
hPa | meters | Surface pressure |
terrain_height |
m | meters | Terrain height |
snow_ice_fraction |
Dimensionless | meters | Fraction of pixel area covered by snow and/or ice |
fitted_slant_column |
molecules/cm^2 | meters | HCHO fitted slant column |
fitted_slant_column_uncertainty |
molecules/cm^2 | meters | HCHO fitted slant column uncertainty |
albedo |
Dimensionless | meters | Surface albedo |
amf |
Dimensionless | meters | HCHO air mass factor |
eff_cloud_fraction |
Dimensionless | meters | Data is filtered to include only observations with effective cloud fraction less than or equal to 50%. |
amf_cloud_fraction |
Dimensionless | meters | Cloud radiance fraction for AMF calculation |
amf_cloud_pressure |
hPa | meters | Cloud pressure for AMF calculation |
Terms of Use
Terms of Use
This dataset is in the public domain and is available without restriction on use and distribution. See NASA's Earth Science Data & Information Policy for additional information.
Citations
NASA/LARC/SD/ASDC. (n.d.). TEMPO gridded HCHO vertical columns V03 (PROVISIONAL) [Data set]. NASA Langley Atmospheric Science Data Center DAAC. Retrieved from https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003
DOIs
Explore with Earth Engine
Code Editor (JavaScript)
var collection = ee.ImageCollection('NASA/TEMPO/HCHO_L3_QA') .filterDate('2024-04-01', '2024-04-05') var visParams = { min: 0, max: 1.5e16, bands: ['vertical_column'], palette: [ '000080', '0000D9', '4000FF', '8000FF', '0080FF', '00D9FF', '80FFFF', 'FF8080', 'D90000', '800000' ] }; Map.setCenter(-95.06, 42.02, 3) Map.addLayer(collection, visParams, 'HCHO vertical column')