简介

海洋2号星座

在轨卫星: HY-2B/HY-2C/HY-2D
载荷: SCAT (sso)
Best quality: 50 km resolution; standard quality: 25 km resolution.
Ku-band (13.25 GHz). Near-global every day.

中法海洋卫星

载荷: 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.

读取

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。
海洋二号星座分发的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海洋卫星的处理为OPER业务处理而CFOSAT同时分发OPER业务处理和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。

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