获取美国gfs风向数据软件安装指南
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基于Ubuntu环境
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依赖eccodes环境
Ubuntu环境就不在这里介绍安装了
eccodes 的依赖
第一步 在linux安装 gcc 和gfortran的环境
第二步 安装 cmake
第三步 下载 对应的eccodes包
安装eccodes文件
1.把下载好的eccodes包上传到 /opt下
tar -xvf eccodes-2.22.1-Source.tar.gz
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安装eccodes库
mkdir build cd build #编译 cmake -DCMAKE_INSTALL_PREFIX=/opt/build/eccodes ../eccodes-2.22.1-Source make ctest make install
####3.如果有=提示安装工具包必须安装
#最为重要的一步 这个是eccodes的工具类 sudo apt install libeccodes-tools
安装nodejs
sudo apt install nodejs
安装npm
sudo install npm
安装 curl
sudo install curl
这时倒入download.sh prepare.js package.sjon 文件
npm install
npm install pngjs
npm install fs
/opt/webgl-wind-master
#####这个shell代码
#!/bin/bash
GFS_DATE="20210816"
GFS_TIME="06"; # 00, 06, 12, 18
RES="1p00" # 0p25, 0p50 or 1p00
BBOX="leftlon=0&rightlon=360&toplat=90&bottomlat=-90"
LEVEL="lev_10_m_above_ground=on"
GFS_URL="https://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_${RES}.pl?file=gfs.t${GFS_TIME}z.pgrb2.${RES}.f000&${LEVEL}&${BBOX}&dir=%2Fgfs.${GFS_DATE}%2F${GFS_TIME}%2Fatmos"
echo "${GFS_URL}&var_UGRD=on"
curl "${GFS_URL}&var_UGRD=on" -o utmp.grib
curl "${GFS_URL}&var_VGRD=on" -o vtmp.grib
grib_set -r -s packingType=grid_simple utmp.grib utmp.grib
grib_set -r -s packingType=grid_simple vtmp.grib vtmp.grib
printf "{\"u\":`grib_dump -j utmp.grib`,\"v\":`grib_dump -j vtmp.grib`}" > tmp.json
rm utmp.grib vtmp.grib
DIR=`dirname $0`
node ${DIR}/prepare.js ${1}/${GFS_DATE}${GFS_TIME}
rm tmp.json
####这是js代码
const PNG = require('pngjs').PNG;
const fs = require('fs');
const data = JSON.parse(fs.readFileSync('tmp.json'));
const name = '/usr/share/nginx/html'+process.argv[2];
const u = data.u.messages[0];
const v = data.v.messages[0];
var width = 0;
var height = 0;
var umax=0;
var umin=0;
var dataDate;
var dataTime;
var uvs;
for (var i=0;i<u.length;i++){
jn = u[i];
if(jn.key=='values'){
uvs = jn.value;
}
if(jn.key=='dataDate'){
dataDate = jn.value;
}
if(jn.key=='dataTime'){
dataTime = jn.value;
}
if(jn.key=='maximum'){
umax = jn.value;
}
if(jn.key=='minimum'){
umin = jn.value;
}
if(jn.key=='Ni'){
width = jn.value;
}
if (jn.key=='Nj'){
height = jn.value-1;
}
}
var vmax=0;
var vmin=0;
var vvs;
for(var h=0;h<v.length;h++){
jv = v[h];
if(jv.key=='values'){
vvs = jv.value;
}
if(jv.key=='maximum'){
vmax = jv.value;
}
if(jv.key=='minimum'){
vmin = jv.value;
}
}
const png = new PNG({
colorType: 2,
filterType: 4,
width: width,
height: height
});
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const i = (y * width + x) * 4;
const k = y * width + (x + width / 2) % width;
png.data[i + 0] = Math.floor(255 * (uvs[k] - umin) / (umax - umin));
png.data[i + 1] = Math.floor(255 * (vvs[k] - vmin) / (vmax - vmin));
png.data[i + 2] = 0;
png.data[i + 3] = 255;
}
}
png.pack().pipe(fs.createWriteStream(name + '.png'));
fs.writeFileSync(name + '.json', JSON.stringify({
source: 'https://nomads.ncep.noaa.gov',
date: formatDate(dataDate + '', dataTime),
width: width,
height: height,
uMin: umin,
uMax: umax,
vMin: vmin,
vMax: vmax
}, null, 2) + '\n');
function formatDate(date, time) {
return date.substr(0, 4) + '-' + date.substr(4, 2) + '-' + date.substr(6, 2) + 'T' +
(time < 10 ? '0' + time : time) + ':00Z';
}
###这里是package.json 文件
{
"name": "webgl-wind",
"version": "0.0.0",
"description": "",
"main": "index.js",
"scripts": {
"build": "rollup -c",
"watch": "rollup -c -w",
"test": "eslint src/*.js demo/index.js data/prepare.js",
"serve": "st -nc -i index.html",
"start": "run-p serve watch"
},
"keywords": [],
"author": "Vladimir Agafonkin",
"license": "ISC",
"devDependencies": {
"eslint": "^3.15.0",
"eslint-config-mourner": "^2.0.1",
"npm-run-all": "^4.0.1",
"pngjs": "^3.0.0",
"rollup": "^0.41.4",
"rollup-plugin-buble": "^0.15.0",
"rollup-plugin-string": "^2.0.2",
"rollup-watch": "^3.2.2",
"st": "^1.2.0"
},
"eslintConfig": {
"extends": "mourner",
"parserOptions": {
"sourceType": "module"
},
"globals": {
"dat": false,
"WindGL": false
},
"rules": {
"no-var": 2,
"prefer-const": 2
}
}
}