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HY-2 satellites are China’s marine environmental dynamic satellites.The major objective of HY-2 series satellites are to monitor and investigate the marine environment, and obtain marine dynamic environmental parameters including sea surface wind, wave height, sea surface height, sea surface temperature, etc. This section provides some detailed information about these products corresponding to the payload, introducing you to the distributed products.

In addition, only HY-2B in HY-2 satellites is equipped with scanning microwave radiometer (SMR), so SMR products are provided by HY-2B and other payload products are provided by HY-2B,HY-2C and HY-2D.

Data products of Altimeter (ALT)

Level	Product name	Data description	Spatial resolution	Product accuracy	Production frequency	data size	Data format
Level 2	OGDR	Near Real-Time data including ROE, wet atmosphere correction data of Correction Microwave Radiometer (CMR), initial height measurement error correction data, significant wave height and wind speed	7km along the track	~10cm	Twice per day	2MB/pass; 27-28 passes per day	Binary/Netcdf
	IGDR	Delayed data with a time of 30 - 52 hours including medium-precision ephemeris precise orbit determination data (MOE), height measurement error correction data, significant wave height, wind speed	7km along the track	~5cm	Twice per day	2MB/pass; 27-28 passes per day	Binary/Netcdf
	SGDR	Delayed data with a time of 30 -52 hours including medium-precision ephemeris precise orbit determination data (MOE), height measurement error correction data, significant wave height, wind speed and waveform data	7km along the track	~5cm	Twice per day	8MB/pass; 27-28 passes per day	Binary/Netcdf
	GDR	Delayed data with a time of 28 - 35 days including high-precision ephemeris precise orbit determination data (POE), height measurement error correction data, significant wave height and wind speed	7km along the track	~5cm	Twice per day	2MB/pass; 27-28 passes per day	Binary/Netcdf
Level 3	Multi-source fusion data	multi-source fusion data of sea surface height anomaly, dynamic height and geostrophic current data	0.25°×0.25°	~5cm	Once per day and three files per time	16MB/day	Netcdf

Data products of Scatterometer (SCA)

Level	Product name	Data description	Spatial resolution	Product accuracy	Production frequency	data size	Data format
Level 2A	radar backscatter coefficient product after matching	generated by matching the backscatter coefficients of the Level 1B radar arranged in time order according to the 25km grid	25km	0.5dB	Twice per day and around 7 orbits each time	42.4MB/orbit	H5
Level 2B	Sea surface wind	the product is retrieved by the matching result	25km	Wind direction: ±20° Wind speed: ±2m/s	Twice per day and around 7 orbits each time	5.9MB/orbit	H5
Level 3	gridded sea surface wind vector product	gridded sea surface wind vector product with equal latitude and longitude projection	0.25°×0.25°	Wind direction: ±20° Wind speed: ±2m/s	Once per day	4.8MB/day	H5
Level 4	multi-source fusion product	multi-source fusion product with equal latitude and longitude projection	0.25°×0.25°	Wind direction: ±20° Wind speed: ±2m/s	Once per day	4.8MB/day	H5

Data products of Scanning Microwave Radiometer (SMR)

Level	Product name	Data description	Spatial resolution	Product accuracy	Production frequency	data size	Data format
Level 2B	quick retrieval products	sea surface temperature with several resolutions, sea surface wind, atmospheric water vapor content, cloud liquid water content, rainfall rate and sea ice density, and quality flags	Res0: original resolution Res6: 90x150km Res10: 70x110km Res18: 36x60km	SST: ≤1℃; Wind speed: ≤2m/s or 10%; Atmospheric water vapor content: ≤3.5mm; Cloud liquid water content: ≤0.05mm	Twice per day	25MB/pass	H5
Level 2C	standard product	sea surface temperature with several resolutions, sea surface wind, atmospheric water vapor content, cloud liquid water content, rainfall rate and sea ice density.	Res0: original resolution Res6: 90x150km Res10: 70x110km Res18: 36x60km	SST: ≤1℃; Wind speed: ≤2m/s or 10%; Atmospheric water vapor content: ≤3.5mm; Cloud liquid water content: ≤0.05mm	Twice per day	25MB/pass	H5
Level 3	multi-time scale global statistical products	daily, weekly, monthly, and annual global and polar sea surface temperature, sea surface wind speed, atmospheric water vapor content, cloud liquid water content, rainfall rate and sea ice density grid data products	Global area: 0.25°×0.25° Polar area: 25km x 25km	SST: ≤1℃; Wind speed: ≤2m/s or 10%; Atmospheric water vapor content: ≤3.5mm; Cloud liquid water content: ≤0.05mm	Once per day/3 days/week/month/season/year	50-175MB	H5
Level 4A	fusion product of single day	sea surface temperature of 25km resolution, cloud liquid water content of 25km, water vapor content of 25km, daytime multi-source fusion sea surface temperature of 25km, nighttime multi-source fusion sea surface temperature of 25km, multi-source fusion sea surface temperature, multi-source fusion water vapor content of 25km, multi-source fusion cloud liquid water content of 25km, daytime multi-source fusion sea surface temperature of 5km, nighttime multi-source fusion sea surface temperature of 5km, multi-source fusion sea surface temperature of 5km	5km and 25km	0.5℃	Once per day	205MB	H5
Level 4B	fusion product of multi-time scale	weekly average, monthly average and annual average full coverage fusion data	5km and 25km	0.5℃	Once per week	205MB	H5

Data products of Correction Microwave Radiometer (CMR)

Level

Product name

Data description

Spatial resolution

Product accuracy

Production frequency

data size

Data format

Level 2B

standard product

standard product is retrieved from Level 2A data including sea surface wind, water vapor content, cloud liquid water content and tropospheric wet delay

18.7GHz：21km

23.8GHz：16.4km

37.0GHz：10.7km

Calibration accuracy: 1K;

Path delay of atmospheric wet troposphere: ±2cm

Twice per day

<6MB/day

HY-1 product system

HY-2 product system

CFOSAT product system

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