QX/T 139-2020 in English

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Standard No:	QX/T 139-2020
Document status:	VALID
Title in English:	Level 1C data format of polar orbiting meteorological satellite atmospheric vertical sounding data - Radiance
Title in Chinese:	极轨气象卫星大气垂直探测资料L1C数据格式辐射率
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-01-21
Implemented on:	2020-05-01
Superseding:	QX/T 139-2011 Name and Format for Satellite Atmospheric Vertical Sounding Data
ICS Classification:	07.060-Geology. Meteorology. Hydrology
Chinese Classification:	A47-Meteorology
Professional Classification:	QX-Meteorology
Related Topics:	planetary atmosphere is139 scientific exploration satellite scientific exploration satellite Atmospheric Ultraviolet Radiation Data Atmospheric daily data Satellite Radiation Data Bubble size detection Is ICP radiation high? qx/t-2020 qx/t 567-2020

本标准规定了极轨气象卫星大气垂直探测的辐射率L1C数据的数据内容和数据格式。本标准适用于国内外极轨气象卫星大气垂直探测的辐射率L1C数据的处理、交换和应用。FY-3 MWRI辐射率L1C数据的格式可参照本标准执行。

Introduction

Analysis of the core content of the standard

Compared with the 2011 version of the standard, QX/T 139-2020 mainly achieves three aspects of upgrades:

Focusing on polar-orbiting satellite radiance data, deleting the original file naming specification
Adding 8 new instrument identifiers such as ATMS and CrIS
Introducing the BUFR coding system, compatible with WMO international standards

Element type	2011 version	2020 version	Description of changes
Basic information	19 items	21 items	Added satellite orbit altitude (Sat_scalti)
Extended information	None	8 items	Added cloud water content, ocean surface wind speed and other elements
Encoding method	Binary	Binary+BUFR	Compatible with international meteorological data exchange standards

When processing HIRAS instrument data:

Confirm satellite ID 523 and instrument ID 955 according to Appendix A
Extract brightness temperature data of 1370 channels according to the format of Table 1
Use the BUFR compression encoding rules in Section 5.2 to process the scan point data

Data quality control: Pay special attention to the quality identification of the Obs_dataqual field
International collaboration: When processing MetOp satellite data, the land surface identification defined by WMO should be used
Hyperspectral data: Instruments such as AIRS need to select channels before encoding

Technical features	Description	Application value
Dynamic bit width encoding	Variable length storage is achieved through descriptors such as 201134	Save more than 30% storage space
Delay repetition factor	031002 descriptor defines the number of channels	Compatible with instruments with different spectral resolutions
Missing value unified processing	All-1 encoding indicates missing measurement	Ensure data integrity

More samples: QC/T 942-2021 JJG 21-2008 DL/T 5154-2012

Sample only — not a preview of QX/T 139-2020

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