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Description

The OMI/Aura Formaldehyde (HCHO) Total Column Daily L3 Weighted Mean Global 0.1deg Lat/Lon Grid (OMHCHOd). The formaldehyde values in each file are the average for 0.1 x 0.1 degree grid cell of cloud-screened total HCHO columns for a single day.

Other variables included in the files are the weight of each grid cell, the standard error of column averages, mean albedo, mean cloud fraction, mean cloud pressure, and surface height. The weight information is useful for combining data from several files and reducing the noise of the retrievals by co-adding in the temporal or spatial dimensions.

The OMHCHOd files are in the netCDF4 format which is compatible with most HDF5 readers and tools. Each file contains daily data from approximately 15 orbits. The maximum file size for the OMHCHOd data product is about 80 Mbytes.

Product Summary

Platforms
Aura
Instruments
OMI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2004-10-01 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1626121562-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7700
Processing Level
3
Published
Updated
Science Keywords
Carbon And Hydrocarbon Compounds

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Chance, K. (2019). OMI/Aura Formaldehyde (HCHO) Total Column Daily L3 Weighted Mean Global 0.1deg Lat/Lon Grid V003 [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA3010 Date Accessed: 2025-12-13

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
key_science_data/column_amount key_science_data/column_amount molecules/cm^2 float32 -1.0000000150475E+30 N/A N/A
key_science_data/column_uncertainty key_science_data/column_uncertainty molecules/cm^2 float32 -1.0000000150475E+30 N/A N/A
latitude latitude degrees_north float32 -1.0000000150475E+30 -90 to 90 N/A
longitude longitude degrees_east float32 -1.0000000150475E+30 -180 to 180 N/A
qa_statistics/data_quality_flag qa_statistics/data_quality_flag N/A int8 2 0 to 2 N/A
qa_statistics/num_samples qa_statistics/num_samples 1 float32 -1 0 to 1000 N/A
support_data/albedo support_data/albedo 1 float32 -1.0000000150475E+30 0 to 1 N/A
support_data/amf support_data/amf 1 float32 -1.0000000150475E+30 0 to 100 N/A
support_data/cloud_fraction support_data/cloud_fraction 1 float32 -1.0000000150475E+30 0 to 1 N/A
support_data/cloud_pressure support_data/cloud_pressure hPa float32 -1.0000000150475E+30 0 to 1200 N/A
support_data/sample_weight support_data/sample_weight 1 float32 -1.0000000150475E+30 0 N/A
support_data/terrain_height support_data/terrain_height m int16 -30000 -1000 to 10000 N/A
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