欧洲数值天气预报文件拆分方法
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欧洲天气数值天气预报可以在 http://data-portal.ecmwf.int/上下载或购买。 欧洲数值天气预报文件也可用工具wgrib和wgrib2来拆分。
下面以欧洲天气预报（grib1格式）为例子：这里提取北京地区的网格N41E117N39E115.
0、首先在Linux机器上安装wgrib。红帽子可在http://download.opensuse.org/repositories/home:/gbvalor/RHEL_5/i386/ 下载。
1、先看grib1文件中包含的网格。
# wgrib /路径/文件名称 -V ;注意：这里是大写的V
rec 1:0:date 2011083000 V kpds5=132 kpds6=100 kpds7=950 levels=(3,182) grid=255 950 mb 3hr fcst:
V=V velocity [m s**-1]
timerange 0 P1 3 P2 0 TimeU 1 nx 17 ny 25 GDS grid 0 num_in_ave 0 missing 0
center 98 subcenter 0 process 140 Table 128 scan: WE:NS winds(N/S)
latlon: lat 41.000000 to 39.000000 by 0.125000 nxny 425
long 117.000000 to 115.000000 by 0.125000, (17 x 25) scan 0 mode 128 bdsgrid 1
min/max data 1.32359 9.41734 num bits 12 BDS_Ref 1.32359 DecScale 0 BinScale -8rec 2:722:date 2011083000 U kpds5=131 kpds6=100 kpds7=950 levels=(3,182) grid=255 950 mb 3hr fcst:
U=U velocity [m s**-1]
timerange 0 P1 3 P2 0 TimeU 1 nx 17 ny 25 GDS grid 0 num_in_ave 0 missing 0
center 98 subcenter 0 process 140 Table 128 scan: WE:NS winds(N/S)
latlon: lat 41.000000 to 39.000000 by 0.125000 nxny 425
long 117.000000 to 115.000000 by 0.125000, (17 x 25) scan 0 mode 128 bdsgrid 1
min/max data -0.197081 5.21894 num bits 12 BDS_Ref -0.197081 DecScale 0 BinScale -9rec 3:1444:date 2011083000 V kpds5=132 kpds6=100 kpds7=950 levels=(3,182) grid=255 950 mb 3hr fcst:
V=V velocity [m s**-1]
timerange 0 P1 3 P2 0 TimeU 1 nx 43 ny 21 GDS grid 0 num_in_ave 0 missing 0
center 98 subcenter 0 process 140 Table 128 scan: WE:NS winds(N/S)
latlon: lat 38.250000 to 35.750000 by 0.125000 nxny 903
long 117.750000 to 123.000000 by 0.125000, (43 x 21) scan 0 mode 128 bdsgrid 1
min/max data 0.940542 10.503 num bits 12 BDS_Ref 0.940542 DecScale 0 BinScale -8............................................................................................................................
2、 提取grib消息 rec后面的行号。
如：获取 1和2。
3、执行提取命令， 生成提取文件。
# wgrib /路径/grib1源文件名称 -v | egrep "(^ 1:|^ 2:)" | wgrib -i /路径/grib1源文件名称 -grib -o /路径/grib1输出文件名称
以下编写一个小程序实现网格数据的提取，它包含两个JAVA文件：cut_grib.java 和RunCommand.java.
package tools;
import java.io.File;
import java.util.*;
public class cut_grib{
private String split_flag ="41.000000 to 39.000000";//过滤条件
String list = "";
/**
* 获得记录号
* @param file
* @return
*/
public boolean pro_(String input_file){
list = "";
Vector runlog= null;
Vector errlog=null;
if (runlog ==null){
runlog = new Vector();
}
if (errlog ==null){
errlog = new Vector();
}
RunCommand rc = new RunCommand();
rc.out_Command("wgrib "+ input_file + " -V ", runlog, errlog);
int len = runlog.size();
if (len>0){
System.out.println(runlog.toString());
}
len = errlog.size();
if (len>0){
System.out.println(errlog.toString());
return false;
}
int len_log =runlog.size();
Iterator it = runlog.iterator();
String int_no = "-1";
String tmp_no = "-1";
while (it.hasNext()){
String line = (String)it.next();
if (line.indexOf("rec")>=0){
int_no = "-1";//行号缓存清除
//行首
int beg_ind = 3;
int end_ind = line.indexOf(":");
String no_=line.substring(beg_ind, end_ind).trim();
System.out.println("获得行号:"+ no_);
int_no = no_;
}else{
if (line.indexOf(split_flag)>=0){
//处理上此的行
if (!int_no.equals("-1")){
if (list.equals("") ){
list = list + "^" + int_no + ":";
}else{
list = list + "|^" + int_no + ":";
}
}
}
}
}
return true;
}
public boolean out_put(String input_file,String output_file){
Vector runlog= null;
Vector errlog=null;
if (runlog ==null){
runlog = new Vector();
}
if (errlog ==null){
errlog = new Vector();
}
RunCommand rc = new RunCommand();
rc.out_Command("wgrib "+input_file+" -v | egrep \"(" + list + ")\" | wgrib -i "+input_file+" -grib -o "+ output_file, runlog, errlog);
int len = runlog.size();
if (len>0){
System.out.println(runlog.toString());
}
len = errlog.size();
if (len>0){
System.out.println(errlog.toString());
return false;
}
return true;
}
private Vector <String> getGribFile(String path){
File dir=new File(path);
File []files=dir.listFiles();
Vector file_list=new Vector();
for(int i=0;i<files.length;i++){
//添加列表
String tmp = files[i].getPath();
file_list.add(tmp);
}
return file_list;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String input_file = "";
String output_file ="";
Vector file_list = new Vector();
//执行命令
cut_grib cf = new cut_grib();
file_list = cf.getGribFile("/ECM_DATA");//grib1文件所在目录
Iterator it = file_list.iterator();
while (it.hasNext()){
input_file = (String)it.next();
output_file = input_file+ "N41E117N39E115.grib1";
cf.pro_(input_file);
cf.out_put(input_file, output_file);
}
}
}
package tools;
import java.io.*;
import java.util.*;
//执行Linux命令
public class RunCommand {
/**
* 命令执行
* @param command_params 命令和参数
* @param runlog 执行后的结果
* @param errlog 错误信息
* @return 0：成功；其他有错误
*/
public int out_Command(String command_params, Vector runlog, Vector errlog){
int rtn = 0;
int file_count = 0;
if (runlog ==null){
return -100;
}
if (errlog ==null){
return -100;
}
try
{
Runtime rt = Runtime.getRuntime();
Process proc;
// /bin/csh -f
// /bin/sh -c
String[] cmd = {
//"/bin/csh",
//"-f",
"/bin/sh",
"-c",
command_params
};
System.out.println("命令执行线程：" + command_params);
proc = rt.exec(cmd);
InputStream stderr = proc.getErrorStream();
InputStreamReader isr_1 = new InputStreamReader(stderr);
BufferedReader br_1 = new BufferedReader(isr_1);
InputStream is = proc.getInputStream();
InputStreamReader isr_2 = new InputStreamReader(is,"GBK");
BufferedReader br_2 = new BufferedReader(isr_2);
String line = null;
//文件落地前，删除一下旧的
while ( (line = br_2.readLine()) != null) {
System.out.println("命令执行线程：" + line);
runlog.add(line+ "\n");
}
while ( (line = br_1.readLine()) != null){
System.out.println("命令执行线程：" + line);
errlog.add(line+ "\n");
}
int exitVal = proc.waitFor();
if (exitVal==0){
rtn = 0;
}else
{
rtn =-1;
}
br_1.close();
isr_1.close();
stderr.close();
br_2.close();
isr_2.close();
is.close();
proc.destroy();
} catch (Exception t){
t.printStackTrace();
rtn =-1;
}
return rtn;
}
public int out_Command(String[] cmd, StringBuffer runlog, StringBuffer errlog){
int rtn = 0;
int file_count = 0;
if (runlog ==null){
return -100;
}
if (errlog ==null){
return -100;
}
try
{
Runtime rt = Runtime.getRuntime();
Process proc;
//System.out.println("命令执行线程：" + command_params);
proc = rt.exec(cmd);
InputStream stderr = proc.getErrorStream();
InputStreamReader isr_1 = new InputStreamReader(stderr);
BufferedReader br_1 = new BufferedReader(isr_1);
InputStream is = proc.getInputStream();
InputStreamReader isr_2 = new InputStreamReader(is,"GBK");
BufferedReader br_2 = new BufferedReader(isr_2);
String line = null;
//文件落地前，删除一下旧的
while ( (line = br_2.readLine()) != null) {
System.out.println("命令执行线程：" + line);
runlog.append(line+ "\n");
}
while ( (line = br_1.readLine()) != null){
System.out.println("命令执行线程：" + line);
errlog.append(line+ "\n");
}
int exitVal = proc.waitFor();
if (exitVal==0){
rtn = 0;
}else
{
rtn =-1;
}
br_1.close();
isr_1.close();
stderr.close();
br_2.close();
isr_2.close();
is.close();
proc.destroy();
} catch (Exception t){
t.printStackTrace();
rtn =-1;
}
return rtn;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Vector runlog= null;
Vector errlog=null;
if (runlog ==null){
runlog = new Vector();
}
if (errlog ==null){
errlog = new Vector();
}
RunCommand rc = new RunCommand();
rc.out_Command("ls / ", runlog, errlog);
int len = runlog.size();
if (len>0){
System.out.println(runlog.toString());
}
len = errlog.size();
if (len>0){
System.out.println(errlog.toString());
}
}
}
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