Google Earth導入GPS設備NMEA文本數據

                      Google Earth導入GPS設備NMEA文本數據

 

一、提取GPS數據生成TXT文本文件

1 GPS設備NMEA文本數據

#gps.txt

$GNGGA,032006.00,2930.35909,N,10634.37156,E,2,12,0.82,252.8,M,-26.5,M,,0000*66
$GNRMC,032007.00,A,2930.35909,N,10634.37156,E,0.000,250.87,190320,2.57,W,D*33
$GNGGA,032007.00,2930.35909,N,10634.37156,E,2,12,0.79,252.8,M,-26.5,M,,0000*63
$GNRMC,032008.00,A,2930.35910,N,10634.37156,E,0.016,250.86,190320,2.57,W,D*32
$GNGGA,032008.00,2930.35910,N,10634.37156,E,2,12,0.82,252.7,M,-26.5,M,,0000*6F
$GNRMC,032009.00,A,2930.35908,N,10634.37150,E,0.450,250.86,190320,2.57,W,D*3A
$GNGGA,032009.00,2930.35908,N,10634.37150,E,2,12,0.86,252.7,M,-26.5,M,,0000*65
$GNRMC,032010.00,A,2930.35904,N,10634.37132,E,0.809,250.76,190320,2.57,W,D*35
$GNGGA,032010.00,2930.35904,N,10634.37132,E,2,12,0.76,252.7,M,-26.5,M,,0000*6A
$GNRMC,032011.00,A,2930.35896,N,10634.37105,E,1.057,250.29,190320,2.57,W,D*32

2 GNGGA數據提取程序

 程序運行環境:Python3.6

2.1 算法程序

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import re


class GetGPS:
    def __init__(self, srcfile,dstfile):
        self.srcfile=srcfile;
        self.dstfile=dstfile;

    def run(self):
        print("GetGPS"+self.srcfile)
        print("run..."+'\n')
        print("SRC: "+self.srcfile+"\n")
        print("DST: " + self.dstfile + "\n")

        dstfd = open(self.dstfile, 'wt', encoding='UTF-8')
        if dstfd == None:
            return ;
        with open(self.srcfile, 'rt', encoding='UTF-8') as fd:
            for line in fd:
                line = line.strip('\n')
                #print(line);
                mtype=re.findall(r"\$(.+?),",line,re.M)
                #print(mtype[0])
                if len(mtype) == 0 :
                    continue
                if mtype[0]!="GNGGA":
                    continue

               # print(line)
                #print(re.findall(r"[^ ]* [^,]*,[^,]*,(.+?),",line,re.M))

                reg = re.compile(r'(?P<mtype>.+?),(?P<time_str>.+?),(?P<latitude_str>.+?),(?P<lathem_str>.+?),(?P<longtitude_str>.+?),(?P<longthem_str>.+?),[^,]*,[^,]*,[^,]*,(?P<altitude_str>.+?),(?P<altunit_str>.+?),')
                regMatch = reg.match(line)
                if regMatch == None :
                    print(line)
                    print("ERROR : regMatch == None")
                    continue
                linebits = regMatch.groupdict()
                #for k, v in linebits.items():
                #    print(k + ": " + v)
                latitude=self.str2latitude(linebits["latitude_str"])
                longtitude=self.str2longtitude(linebits["longtitude_str"])

                strtmp=linebits["time_str"]+','+str(latitude)+','+linebits["lathem_str"]+','+str(longtitude)+','+linebits["longthem_str"]\
                      +','+linebits["altitude_str"]+','+linebits["altunit_str"]
                print(strtmp)
                dstfd.write(strtmp+'\n')

        fd.close();
        dstfd.close();


    def str2latitude(self,latitude_str):
        #print(latitude_str)
        degree=latitude_str[0:2]
        minute=latitude_str[2:]
        #print(degree+" "+minute)
        latitude=round(float(degree) + (float(minute) / 60),6)
       # print(latitude)
        return latitude

    def str2longtitude(self,longtitude_str):
        # print(longtitude_str)
        degree = longtitude_str[0:3]
        minute = longtitude_str[3:]
        # print(degree+" "+minute)
        longtitude = round(float(degree) + (float(minute) / 60),6)
        # print(longtitude)
        return longtitude

2.2 調用方法

if __name__ == '__main__':
    srcfile=r"d://gps.txt"
    dstfile=r"d://gps_out.txt"
    mobj=GetGPS(srcfile,dstfile);
    mobj.run();

2.3 提取GNGGA生成gps_out.txt文件

#gps_out.txt   數據格式爲：世界時間,緯度,緯度半球,經度,經度半球,大地水準面高度異常差值，高度單位

032006.00,29.505985,N,106.572859,E,252.8,M
032007.00,29.505985,N,106.572859,E,252.8,M
032008.00,29.505985,N,106.572859,E,252.7,M
032009.00,29.505985,N,106.572858,E,252.7,M
032010.00,29.505984,N,106.572855,E,252.7,M

二、 Google Earth導入TXT文本文件

1 啓動Google Earth

2 打開gps_out.txt

【文件】--> 【打開】-->選擇gps_out.txt

 

3 數據導入嚮導配置

3.1 指定分隔符

【已限定】-->【逗號】-->【下一步】

3.2 選擇維度/經度字段

【維度字段】選擇第二項

【經度字段】選擇第四項

注意：字段要與gps_out.txt數據格式相對應

3.3 指定字段類型

可採用默認選項

 

4 顯示GPS數據

4.1 配置Google Earth軟件的位置

在Google Earth軟件的左側位置管理窗口中選擇臨時位置裏剛加入的gps_out.txt

 

4.2 應用樣式模板

可選擇【否】

4.3 gps數據的展示效果