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# Introduction

HaiYang 2 [1]

Operational Sat: HY-2B/HY-2C/HY-2D flying on Sunsynchronous orbit
Instrument: SCAT (sso)
Best quality: 50 km resolution; standard quality: 25 km resolution.
Ku-band (13.25 GHz). Near-global every day.

Chinese-French Oceanography Satellite [2]

Instrument: SCAT (CFOSAT)
High quality data: 50 km resolution. Basic sampling: 10 km resolution.
Rotating Fan-beam Scatterometer (RFSCAT). Ku-band (13.256 GHz), dual polarisation (HH and VV). Global in one week.

# Read

国家卫星海洋应用中心已通过实时FTP分发HY-2B/2C/CFOSAT卫星数据。
HaiYang 系列卫星分发的SCA L2B数据为HDF5格式,CFOSAT 则为NetCDF格式。
在处理方式上海洋中心对HY卫星的处理为OPER业务处理而CFOSAT同时分发OPER业务处理EXPR快交付两种,数据读取上有差异。此处只使用EXPR快交付产品。

Wind & Direction

import h5py
import netCDF4
hy = h5py.File("H2B_OPER_SCA_L2B_OR_20210828T225139_20210829T003602_14257_pwp_250_07_owv.h5", "r")
cfo = netCDF4.Dataset("CFO_EXPR_SCA_C_L2B_OR_20210723T100441_15127_125_33_owv.nc")
lats = cfo.variables['wvc_lat'][:]
lons = cfo.variables['wvc_lon'][:] 
wind_speed = cfo.variables['wind_speed_selection'][:]
wind_dir = cfo.variables['wind_dir_selection'][:]
u = (wind_speed * np.sin(np.radians(wind_dir))
v = (wind_speed * np.cos(np.radians(wind_dir))

注意:

  • 使用wind_dir_selection而不是wind_dir以绘制正确风向

  • wind_dir_selection中的方向不再需要 - 180deg

# Plot

BigShuiTai Plotter https://github.com/BigShuiTai/HY-CFOSAT-ASCAT-Wind-Data-Plotter (请等待使用正式发布的Version 1.0.0)
更多个性化设置详见Readme。
See https://github.com/BigShuiTai/HY-CFOSAT-ASCAT-Wind-Data-Plotter/issues/4

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