EMITL2BCH4ENH v001

EMIT L2B Methane Enhancement Data 60 m


PI: Robert Green

Description

The Earth Surface Mineral Dust Source Investigation (EMIT) instrument measures surface mineralogy, targeting the Earth’s arid dust source regions. EMIT is installed on the International Space Station (ISS) and uses imaging spectroscopy to take measurements of the sunlit regions of interest between 52° N latitude and 52° S latitude. An interactive map showing the regions being investigated, current and forecasted data coverage, and additional data resources can be found on the VSWIR Imaging Spectroscopy Interface for Open Science (VISIONS) EMIT Open Data Portal.

In addition to its primary objective described above, EMIT has demonstrated the capacity to characterize methane (CH4) and carbon dioxide (CO2) point-source emissions by measuring gas absorption features in the short-wave infrared bands. The EMIT Level 2B Greenhouse Gas (GHG) series of products can be used to identify and quantify point source emissions. The EMIT Level 2B Methane Enhancement Data (EMITL2BCH4ENH) Version 1 data product is a total vertical column enhancement estimate of methane in parts per million meter (ppm m) based on an adaptive matched filter approach. EMITL2BCH4ENH provides per-pixel methane enhancement data used to identify methane plume complexes. The initial release of the EMITL2BCH4ENH data product will only include granules where methane plume complexes have been identified. Each granule contains one Cloud Optimized GeoTIFF (COG) file at a spatial resolution of 60 meters (m): Methane Enhancement (EMIT_L2B_CH4ENH). The EMITL2BCH4ENH file contains methane enhancement data based primarily on EMITL1BRAD radiance values.

Each granule is approximately 75 kilometer (km) by 75 km, nominal at the equator, and some granules near the end of an orbit segment reaching 150 km in length.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionEMIT
DOI10.5067/EMIT/EMITL2BCH4ENH.001
File Size~15 MB
Temporal ResolutionVaries
Temporal Extent2022-08-09 to Present
Spatial ExtentGlobal (52 °N to 52 °S Latitude)
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatCloud Optimized GeoTIFF (COG)
Geographic Dimensions~75 km x 75 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers1
Columns/Rows1242 x 1280
Pixel Size60 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
EMIT_L2B_CH4ENH Methane Enhancement Values ppm m 32-bit floating point N/A -9999 N/A N/A

Scenes have at least 1280 rows. To prevent small scenes, those at the end of an orbit segment will have up to 2559 rows.

Known Issues

  • Data acquisition gap: From September 13, 2022, through January 6, 2023, a power issue resulted in a shutdown of the EMIT sensor. Due to this shut down no data was acquired during that timeframe.

About the image

Methane enhancement data from the EMITL2BCH4ENH version 1 product over the southwestern United States on February 05, 2023.

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Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)

Using the Data

E-Learning

Access Data

Citation

DOI: 10.5067/EMIT/EMITL2BCH4ENH.001