EMITL2BCH4PLM v001

EMIT L2B Estimated Methane Plume Complexes 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 locations of methane plumes along with metadata, 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 Estimated Methane Plume Complexes (EMITL2BCH4PLM) Version 1 data product provides estimated methane plume complexes in parts per million meter (ppm m) along with uncertainty data. The EMITL2BCH4PLM data product will only be generated where methane plume complexes have been identified. To reduce the risk of false positives, all EMITL2BCH4ENH data undergo a manual review (or identification and confirmation) process before being designated as a plume complex. For more information on the manual review process, see Section 4.2.2 of the EMIT GHG Algorithm Theoretical Basis Document (ATBD). Each EMITL2BCH4PLM granule is sized to a specific plume complex but may cross multiple EMITL2BCH4ENH granules. A list of source EMITL2BCH4ENH granules is included in the GeoTIFF file metadata as well as the GeoJSON file. Each EMITL2BCH4PLM granule contains two files: one Cloud Optimized GeoTIFF (COG) file at a spatial resolution of 60 meters (m) and one GeoJSON file. The EMITL2BCH4PLM COG file contains a raster image of a methane plume complex extracted from EMITL2BCH4ENH v001 data. The EMITL2BCH4PLM GeoJSON file contains a vector outline of the plume complex, a list of source scenes, coordinates of the maximum enhancement values, and the uncertainty of the plume complex.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionEMIT
DOI10.5067/EMIT/EMITL2BCH4PLM.001
File Size~4 KB
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 Dimensions74.5 km x 76.8 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers2
Columns/RowsVaries x Varies
Pixel Size60 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
EMIT_L2B_CH4PLM Methane Plume Complex Image ppm m 32-bit unsigned integer N/A -9999 N/A N/A
EMIT_L2B_CH4PLMMETA Methane Plume Complex Metadata GeoJSON N/A N/A N/A N/A N/A N/A

Known Issues

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

About the image

Methane plume complex data from the EMITL2BCH4PLM 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/EMITL2BCH4PLM.001