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awxreader's Issues

投影坐标是否准确？

AwxReader/awx/__init__.py

Line 279 in 4b1e4da

x = np.linspace(ll_x, ur_x, h2.width)

我尝试读取Lambert投影的数据，也把投影中心当作图像中心，但是反算出来的经纬度范围和二级头信息中的经纬度范围不太匹配。

推测投影中心并不是图像中心。

NSMC的经纬度对照表格点数是512*512的不确定怎么缩放：http://satellite.nsmc.org.cn/PortalSite/StaticContent/DocumentDownload.aspx?TypeID=22

方便加QQ或者微信讨论下吗？

to_dataarray

使用to_dataarray弹出错误：

ValueError: coordinate 'time' is a DataArray dimension, but it has shape () rather than expected shape (1,) matching the dimension size

修改如下：

return xr.DataArray(self.data[None, :, :], coords={'time': [self.obs_start_datetime()],
                                                               'lat': self.lat, 'lon': self.lon},
                                dims=('time', 'lat', 'lon'), name=self.product_type)

不好意思，我就不pull request了.

数据块类型错误

AWX格点产品云顶亮度温度TBB应当被论断为无符号型，同时取质量控制下限和上限之间的值，需改正。

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