经纬度范围
lon = 7849;lat = 5146;time = 12;double lon(lon=7849);
:long_name = "longitude";
:unit = "degree";
double lat(lat=5146);
:long_name = "latitude";
:unit = "degree";
double time(time=12);
:long_name = "time";
:unit = "2020.01-2020.12";
:calendar = "gregorian";
short pre(time=12, lat=5146, lon=7849);
:long_name = "monthly precipitation";
:unit = "mm";
:missing_value = -32768.0; // double
2022年1-12月单个文件，总数据量391364412条，大小1G
Java解析代码如下，使用netcdf
