TanagerMethane
Methane Products Overview
Each TanagerMethane item has an automated methane detection algorithm run on it, derived from a matched filter (doi:10.5194/amt-8-4383-2015).
TanagerMethane products are only offered in their orthorectified format. These products can be obtained from the Planet APIs using the TanagerMethane item type.
A Tanager Methane Product is representative of a methane detection attempt on a TanagerScene item. They have the same extent as a TanagerScene. They are represented in the Planet Platform as the TanagerMethane item type.
The Methane QuickLook (MQL) bundle is designed for easy interpretation by methane experts with limited remote sensing knowledge. Within each bundle, you can access multiple imagery assets listed below for their purposes.
Tanager Methane QuickLook Products
Tanager’s Methane QuickLook is a low-latency, derived methane product that reveals point source emission locations and estimates of magnitude in kg/hr for observed plumes. It will be delivered to customers within 72 hours of acquisition, enabling you to identify and take action quickly when emissions are detected.
Methane Plume Metadata
Relevant for ql_ch4_json TanagerMethane assets.
| Parameter | Description | Type |
|---|---|---|
| plume_id | Unique identifier for each plume. The format is <stripid>_<part>. The “part” postfix (For example, A, B, C) identifies multiple plumes captured in the same image in the order they were detected. | string |
| plume_quality | ** This field is used for Methane QuickLook, ql_ch4_json asset-type. ** Qualitative assessment of plume quality captured by a human operator during the plume detection process (good, questionable, or bad). More on the Plume quality classification below. | string |
| plume_provider | Identifies the organization who identified the plume. | string |
| plume_provider_id | Plume ID according to the plume_provider. Planet assigns a new plume ID to match existing naming conventions. | string |
| plume_provider_version | Plume provenance information. This information is not directly useful to customers, but can be used by Planet and the plume_provider to inspect data quality issues. | string |
| datetime | Date and time of the acquisition in Coordinated Universal Time (UTC). | datetime |
| ime | The total kilograms (kg) of methane in a plume above the background concentration at the time of image capture. | float |
| fetch | Plume length, meters (m) | float |
| emission | Quantified emission rate of a plume, estimated using the Integrated Methane Enhancement method. (Duren et al., 2019 - "California's Methane Super-Emitters", Nature) | |
| emission_uncertainty | The uncertainty in an emission rate is derived from uncertainty in IME and wind speed. | |
| wind_speed_avg | Mean wind speed m/s | float |
| wind_speed_std | Standard deviation wind speed m/s | float |
| wind_direction_avg | Wind direction (degrees) | float |
| wind_direction_std | Wind direction standard deviation (degrees) | float |
| wind_source | Wind source from reanalysis. (For example, Openmeteo, HRRR, ERA5) | string |
| strip_id | Strip ID of the Tanager collect used for plume detection. | string |
Plume Quality Classification
Planet classifies detected plumes into three categories: Good, Questionable, and Bad, based on the following criteria:
Good: The plume is unambiguous, with a well-defined shape and minimal artifacts, making it reliable for further analysis.Questionable: The plume is clearly present, but there are issues. For example: irregular shape or retrieval artifacts that could affect the accuracy of quantification. A post-emission QC process will also assess whetherQuestionableplumes are suitable for publishing an emission rate or if only the detection will be reported.Bad: It is unclear whether the detected feature is a plume. However, this is not a final state. After an initial review, a secondary post-emission quality control process is conducted. This review determines whether the detection should be discarded or reclassified asQuestionable.
TanagerMethane Item Type
Item Properties
| Field | Description | Data Type |
|---|