echarts—GL 矢量场图示例的gfs.json中header里各字段的意义及data中值的计算方法？

Question

"header":?{
"discipline":?0,
"disciplineName":?"Meteorological products",
"gribEdition":?2,
"gribLength":?133963,
"center":?7,
"centerName":?"US National Weather Service - NCEP(WMC)",
"subcenter":?0,
"refTime":?"2014-11-30T06:00:00.000Z",
"significanceOfRT":?1,
"significanceOfRTName":?"Start of forecast",
"productStatus":?0,
"productStatusName":?"Operational products",
"productType":?1,
"productTypeName":?"Forecast products",
"productDefinitionTemplate":?0,
"productDefinitionTemplateName":?"Analysis/forecast at horizontal level/layer at a point in time",
"parameterCategory":?2,
"parameterCategoryName":?"Momentum",
"parameterNumber":?2,
"parameterNumberName":?"U-component_of_wind",
"parameterUnit":?"m.s-1",
"genProcessType":?2,
"genProcessTypeName":?"Forecast",
"forecastTime":?6,
"surface1Type":?100,
"surface1TypeName":?"Isobaric surface",
"surface1Value":?85000,
"surface2Type":?255,
"surface2TypeName":?"Missing",
"surface2Value":?0,
"gridDefinitionTemplate":?0,
"gridDefinitionTemplateName":?"Latitude_Longitude",
"numberPoints":?65160,
"shape":?6,
"shapeName":?"Earth spherical with radius of 6,371,229.0 m",
"gridUnits":?"degrees",
"resolution":?48,
"winds":?"true",
"scanMode":?0,
"nx":?360,
"ny":?181,
"basicAngle":?0,
"subDivisions":?0,
"lo1":?0,
"la1":?90,
"lo2":?359,
"la2":?-90,
"dx":?1,
"dy":?1
},
"data":?[
3.88,
4.04,
4.19,
4.34,
4.49,
4.64,
4.78,
...
]

Answer 1

等待大神解答