问题描述
我不精通 python，我确信有一个简单的解决方案（尽管我已经看过了）。我从 lpdaac 教程中得到了这段代码。
我的输入是从 MOdis 卫星下载的 NETCDF4 文件。打印文件的元数据返回变量
file_in = Dataset(file_list[0],'r',format = 'NETCDF4')
#print Metadata
list(file_in.variables)
Out[19]: ['crs','time','lat','lon','_1_km_16_days_EVI','_1_km_16_days_VI_Quality']
我想将时间变量转换为日期格式，然后每年只选择 1 个日期。这是转换为日期格式的代码：
from netCDF4 import num2date
times = file_in.variables["time"] #import time variables
dates = num2date(times[:],times.units) #get the time info
dates = [date.strftime("%Y-%m-%d") for date in dates] #get the list of datetime
print(dates)
日期如下：
['2000-06-25','2000-07-11','2000-07-27','2000-08-12','2000-08-28','2000-09-13','2000-09-29','2000-10-15','2000-10-31','2000-11-16','2000-12-02','2000-12-18','2001-01-01','2001-01-17','2001-02-02','2001-02-18','2001-03-06','2001-03-22','2001-04-07','2001-04-23','2001-05-09','2001-05-25','2001-06-10','2001-06-26','2001-07-12','2001-07-28','2001-08-13','2001-08-29','2001-09-14','2001-09-30','2001-10-16','2001-11-01','2001-11-17','2001-12-03','2001-12-19','2002-01-01','2002-01-17','2002-02-02','2002-02-18','2002-03-06','2002-03-22','2002-04-07','2002-04-23','2002-05-09','2002-05-25','2002-06-10','2002-06-26','2002-07-12','2002-07-28','2002-08-13','2002-08-29','2002-09-14','2002-09-30','2002-10-16','2002-11-01','2002-11-17','2002-12-03','2002-12-19','2003-01-01','2003-01-17','2003-02-02','2003-02-18','2003-03-06','2003-03-22','2003-04-07','2003-04-23','2003-05-09','2003-05-25','2003-06-10','2003-06-26','2003-07-12','2003-07-28','2003-08-13','2003-08-29','2003-09-14','2003-09-30','2003-10-16','2003-11-01','2003-11-17','2003-12-03','2003-12-19','2004-01-01','2004-01-17','2004-02-02','2004-02-18','2004-03-05','2004-03-21','2004-04-06','2004-04-22','2004-05-08','2004-05-24','2004-06-09','2004-06-25','2004-07-11','2004-07-27','2004-08-12','2004-08-28','2004-09-13','2004-09-29','2004-10-15','2004-10-31','2004-11-16','2004-12-02','2004-12-18','2005-01-01','2005-01-17','2005-02-02','2005-02-18','2005-03-06','2005-03-22','2005-04-07','2005-04-23','2005-05-09','2005-05-25','2005-06-10','2005-06-26','2005-07-12','2005-07-28','2005-08-13','2005-08-29','2005-09-14','2005-09-30','2005-10-16','2005-11-01','2005-11-17','2005-12-03','2005-12-19','2006-01-01','2006-01-17','2006-02-02','2006-02-18','2006-03-06','2006-03-22','2006-04-07','2006-04-23','2006-05-09','2006-05-25','2006-06-10','2006-06-26','2006-07-12','2006-07-28','2006-08-13','2006-08-29','2006-09-14','2006-09-30','2006-10-16','2006-11-01','2006-11-17','2006-12-03','2006-12-19','2007-01-01','2007-01-17','2007-02-02','2007-02-18','2007-03-06','2007-03-22','2007-04-07','2007-04-23','2007-05-09','2007-05-25','2007-06-10','2007-06-26','2007-07-12','2007-07-28','2007-08-13','2007-08-29','2007-09-14','2007-09-30','2007-10-16','2007-11-01','2007-11-17','2007-12-03','2007-12-19','2008-01-01','2008-01-17','2008-02-02','2008-02-18','2008-03-05','2008-03-21','2008-04-06','2008-04-22','2008-05-08','2008-05-24','2008-06-09','2008-06-25','2008-07-11','2008-07-27','2008-08-12','2008-08-28','2008-09-13','2008-09-29','2008-10-15','2008-10-31','2008-11-16','2008-12-02','2008-12-18','2009-01-01','2009-01-17','2009-02-02','2009-02-18','2009-03-06','2009-03-22','2009-04-07','2009-04-23','2009-05-09','2009-05-25','2009-06-10','2009-06-26','2009-07-12','2009-07-28','2009-08-13','2009-08-29','2009-09-14','2009-09-30','2009-10-16','2009-11-01','2009-11-17','2009-12-03','2009-12-19','2010-01-01','2010-01-17','2010-02-02','2010-02-18','2010-03-06','2010-03-22','2010-04-07','2010-04-23','2010-05-09','2010-05-25','2010-06-10','2010-06-26','2010-07-12','2010-07-28','2010-08-13','2010-08-29','2010-09-14','2010-09-30','2010-10-16','2010-11-01','2010-11-17','2010-12-03','2010-12-19','2011-01-01','2011-01-17','2011-02-02','2011-02-18','2011-03-06','2011-03-22','2011-04-07','2011-04-23','2011-05-09','2011-05-25','2011-06-10','2011-06-26','2011-07-12','2011-07-28','2011-08-13','2011-08-29','2011-09-14','2011-09-30','2011-10-16','2011-11-01','2011-11-17','2011-12-03','2011-12-19','2012-01-01','2012-01-17','2012-02-02','2012-02-18','2012-03-05','2012-03-21','2012-04-06','2012-04-22','2012-05-08','2012-05-24','2012-06-09','2012-06-25','2012-07-11','2012-07-27','2012-08-12','2012-08-28','2012-09-13','2012-09-29','2012-10-15','2012-10-31','2012-11-16','2012-12-02','2012-12-18','2013-01-01','2013-01-17','2013-02-02','2013-02-18','2013-03-06','2013-03-22','2013-04-07','2013-04-23','2013-05-09','2013-05-25','2013-06-10','2013-06-26','2013-07-12','2013-07-28','2013-08-13','2013-08-29','2013-09-14','2013-09-30','2013-10-16','2013-11-01','2013-11-17','2013-12-03','2013-12-19','2014-01-01','2014-01-17','2014-02-02','2014-02-18','2014-03-06','2014-03-22','2014-04-07','2014-04-23','2014-05-09','2014-05-25','2014-06-10','2014-06-26','2014-07-12','2014-07-28','2014-08-13','2014-08-29','2014-09-14','2014-09-30','2014-10-16','2014-11-01','2014-11-17','2014-12-03','2014-12-19','2015-01-01','2015-01-17','2015-02-02','2015-02-18','2015-03-06','2015-03-22','2015-04-07','2015-04-23','2015-05-09','2015-05-25','2015-06-10','2015-06-26','2015-07-12','2015-07-28','2015-08-13','2015-08-29','2015-09-14','2015-09-30','2015-10-16','2015-11-01','2015-11-17','2015-12-03','2015-12-19','2016-01-01','2016-01-17','2016-02-02','2016-02-18','2016-03-05','2016-03-21','2016-04-06','2016-04-22','2016-05-08','2016-05-24','2016-06-09','2016-06-25','2016-07-11','2016-07-27','2016-08-12','2016-08-28','2016-09-13','2016-09-29','2016-10-15','2016-10-31','2016-11-16','2016-12-02','2016-12-18','2017-01-01','2017-01-17','2017-02-02','2017-02-18','2017-03-06','2017-03-22','2017-04-07','2017-04-23','2017-05-09','2017-05-25','2017-06-10','2017-06-26','2017-07-12','2017-07-28','2017-08-13','2017-08-29','2017-09-14','2017-09-30','2017-10-16','2017-11-01','2017-11-17','2017-12-03','2017-12-19','2018-01-01','2018-01-17','2018-02-02','2018-02-18','2018-03-06','2018-03-22','2018-04-07','2018-04-23','2018-05-09','2018-05-25','2018-06-10','2018-06-26','2018-07-12','2018-07-28','2018-08-13','2018-08-29','2018-09-14','2018-09-30','2018-10-16','2018-11-01','2018-11-17','2018-12-03','2018-12-19','2019-01-01','2019-01-17','2019-02-02','2019-02-18','2019-03-06','2019-03-22','2019-04-07','2019-04-23','2019-05-09','2019-05-25','2019-06-10','2019-06-26','2019-07-12','2019-07-28','2019-08-13','2019-08-29','2019-09-14','2019-09-30','2019-10-16','2019-11-01','2019-11-17','2019-12-03','2019-12-19','2020-01-01','2020-01-17','2020-02-02','2020-02-18','2020-03-05','2020-03-21','2020-04-06','2020-04-22','2020-05-08','2020-05-24','2020-06-09','2020-06-25','2020-07-11','2020-07-27']
这些是我想要在数据框中的日期：
dates = ['2000-07-11','2020-07-11']
我尝试只定义一个新的 dates 数据框，但我认为这给我后面的代码带来了问题，所以如果有第一个 dates 数据框，我只想将其子集简单的方法。
感谢您的帮助
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