气象数据之风向数据json格式解析

数据示例：（全球风向数据）

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[ { "header": { "discipline": 0, "disciplineName": "Meteorological products", "gribEdition": 2, "gribLength": 251674, "center": 7, "centerName": "US National Weather Service - NCEP(WMC)", "subcenter": 0, "refTime": "2017-12-27T00:00:00.000Z", "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": 0, "surface1Type": 103, "surface1TypeName": "Specified height level above ground", "surface1Value": 10, "surface2Type": 255, "surface2TypeName": "Missing", "surface2Value": 0, "gridDefinitionTemplate": 0, "gridDefinitionTemplateName": "Latitude_Longitude", "numberPoints": 259920, "shape": 6, "shapeName": "Earth spherical with radius of 6,371,229.0 m", "gridUnits": "degrees", "resolution": 48, "winds": "true", "scanMode": 0, "nx": 720, "ny": 361, "basicAngle": 0, "lo1": 0, "la1": 90, "lo2": 359.5, "la2": -90, "dx": 0.5, "dy": 0.5 }, "data": [ 2.3011596, 2.3011596, 2.3011596, 2.2811596, ...... 1.1211597, 1.1511596, 1.1711596 ] }, { "header": { "discipline": 0, "disciplineName": "Meteorological products", "gribEdition": 2, "gribLength": 245626, "center": 7, "centerName": "US National Weather Service - NCEP(WMC)", "subcenter": 0, "refTime": "2017-12-27T00:00:00.000Z", "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": 3, "parameterNumberName": "V-component_of_wind", "parameterUnit": "m.s-1", "genProcessType": 2, "genProcessTypeName": "Forecast", "forecastTime": 0, "surface1Type": 103, "surface1TypeName": "Specified height level above ground", "surface1Value": 10, "surface2Type": 255, "surface2TypeName": "Missing", "surface2Value": 0, "gridDefinitionTemplate": 0, "gridDefinitionTemplateName": "Latitude_Longitude", "numberPoints": 259920, "shape": 6, "shapeName": "Earth spherical with radius of 6,371,229.0 m", "gridUnits": "degrees", "resolution": 48, "winds": "true", "scanMode": 0, "nx": 720, "ny": 361, "basicAngle": 0, "lo1": 0, "la1": 90, "lo2": 359.5, "la2": -90, "dx": 0.5, "dy": 0.5 }, "data": [ -0.12500733, -0.14500733, -0.16500732, ...... -2.9750073, -2.9650073 ] } ]

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一、风向数据介绍：

示例风向数据将地球以0.5为步长分为横向720、纵向361个栅格。然后记录了每个栅格中南北方向（U）、东西方向（V）两个方向上的风力值。

示例数据中data中记录了720*361=259920个风力数值。数据中已省略。

二、header参数介绍：

parameterCategory	配置了数据记录内容，风力数据默认为2
parameterCategoryName	风向数据默认：Momentum
parameterNumber	记录了数据方向：U向为2，V向为3
parameterNumberName	U-component_of_wind/V-component_of_wind
numberPoints	数据点数量
nx	横向划分栅格数量
ny	纵向划分栅格数量
dx	横向步长
dy	纵向步长
lo1	横向起点，全球默认为0
la1	纵向起点，全球默认为-90
lo2	横向终点，全球默认359.5，根据步长有所不同
la2	纵向终点，全球默认-90

注意：这些就是前端展示风向数据的主要参数，所以做数据转换时，只要将其配置完成即可。

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