M4_30min

\"M4 is located on a well drained Cassiope heath, about 150 meters north of the 'Climate station' (operated by ClimateBasis).
In 2009 NDVI sensors were installed and data recorded every 30 min. In 2014 temperature probes were installed in different depths in the soil. This data is also recorded every 30 min. Thus, the 30 min file contains data from 2009 to present.
Data was recorded in a CR10x Campbel scientifix data logger until June 2014, where the data logger was changed to a CR1000.

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M4站点坐落于一片排水良好的岩须灌丛（Cassiope heath）中，距离由ClimateBasis运营的气象站（Climate station）以北约150米。
2009年，研究人员在此安装了归一化差分植被指数（NDVI）传感器，以每30分钟一次的频次记录数据；2014年，又在土壤不同深度布设了温度探头，同样采用每30分钟一次的频率采集数据。
由此，该30分钟频次的数据文件包含了2009年至今的全部观测数据。
数据最初由CR10x型Campbell Scientific数据记录仪存储，直至2014年6月，随后更换为CR1000型数据记录仪。