Python怎样将nc数据每天14:00数据单独存为另一个nc
时间: 2023-04-10 08:04:27 浏览: 114
文件?
可以使用Python中的netCDF4库来处理nc数据。具体步骤如下:
1. 打开原始nc文件
```python
import netCDF4 as nc
data = nc.Dataset('original.nc', 'r')
```
2. 获取时间变量
```python
time_var = data.variables['time']
```
3. 获取时间变量的单位和日历
```python
time_unit = time_var.units
time_calendar = time_var.calendar
```
4. 将时间变量转换为Python datetime对象
```python
import datetime as dt
dates = nc.num2date(time_var[:], units=time_unit, calendar=time_calendar)
```
5. 找到14:00的时间点
```python
target_time = dt.time(14, 0)
for i, date in enumerate(dates):
if date.time() == target_time:
target_index = i
break
```
6. 创建新的nc文件并复制原始文件的结构
```python
new_data = nc.Dataset('new.nc', 'w')
for name, dim in data.dimensions.items():
new_data.createDimension(name, len(dim))
for name, var in data.variables.items():
new_var = new_data.createVariable(name, var.dtype, var.dimensions)
new_var.setncatts({k: var.getncattr(k) for k in var.ncattrs()})
```
7. 将目标时间点的数据写入新文件
```python
for name, var in data.variables.items():
if name != 'time':
new_var = new_data.variables[name]
new_var[:] = var[target_index, :]
else:
new_var = new_data.variables[name]
new_var[0] = time_var[target_index]
```
8. 关闭文件
```python
data.close()
new_data.close()
```
这样,新的nc文件中就只包含了14:00的数据。
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