N: 90 S: -90 E: 180 W: -180
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
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.
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READ-ME
PI DOCUMENTATION
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
GENERAL DOCUMENTATION
Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | 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 |