从NMEA日志文件中提取的坐标保存在CSV文件中 [英] Save coordinates extracted from NMEA log file in a CSV file

问题描述

作为Python的初学者，我正在处理一项任务.该任务正在开发一个程序，该程序通过虚拟端口读取NMEA日志文件，并且:

• 仅打印"GPGGA"行
• 从这些"GPGGA"行打印坐标(纬度，经度)
• 在CSV文件中提取这些坐标
• 在KML文件中提取这些坐标

遵循我的代码:

 导入序列从pynmea导入nmea导入csvser = serial.Serial('COM4')ser.baudrate = 4800f =打开('coord_list.csv'，'w +')打印(等待数据")而True:尝试:消息= ser.readline().decode()消息= message.strip()如果消息中有"$ GPGGA":打印(留言)gpgga = nmea.GPGGA()gpgga.parse(消息)lat = float(gpgga.latitude)lon =浮点数(gpgga.longitude)print("Lat％f Long％f"％(lat，lon))为我在消息中:coord_list = []坐标= [gpgga.latitude，gpgga.longitude]coord_list.append(coord)f.write(coord_list)f.close()除了KeyboardInterrupt:增加ser.close() 

对于前两个项目符号，示例输出如下:

 等待数据$ GPGGA，170609.941,5335.6665，N，01021.2637，E，1,09,01.1,35.9，M，40.2，M ,, * 58纬度5335.666500长1021.263700$ GPGGA，170610.941,5335.6665，N，01021.2637，W，1,09,01.1,36.0，M，40.2，M，* 5A 

使用此代码，我得到了一个错误:

  f.write(coord_list)TypeError:write()参数必须为str，而不是list 

我无法将坐标保存在CSV文件下.我不知道如何编写正确的代码来解决它.无论我尝试什么，我都会遇到其他错误或什么也没有.

解决方案

问题出在您的错误提示上， write 仅采用字符串.
csv格式通常以逗号分隔.
所以你可以这样:

  f.write("{}，{} \ n" .format(gpgga.latitude，gpgga.longitude)) 

也可以在循环中关闭文件，但不要打开它.因此它不会在第一个循环后写入.

As a beginner in Python I am dealing with a task. The task is developing a program that reads the NMEA log files via a virtual port and:

• printing only "GPGGA" lines
• printing coordinates (lat,lon) from these "GPGGA" lines
• extracting these coordinates in a CSV file
• extracting these coordinates in a KML file

My code is followed:

import serial
from pynmea import nmea
import csv

ser=serial.Serial('COM4')
ser.baudrate=4800
f = open('coord_list.csv', 'w+')
print('Waiting for data')
while True:
    try:     
        message = ser.readline().decode() 
        message = message.strip()     
           if '$GPGGA' in message:    
                print(message)
                gpgga = nmea.GPGGA()
                gpgga.parse(message)   
                lat = float(gpgga.latitude)
                lon = float(gpgga.longitude)
                print("Lat %f Long %f" % (lat, lon))
                for i in message:
                    coord_list = []
                    coord = [gpgga.latitude,gpgga.longitude]
                    coord_list.append(coord)
                    f.write(coord_list)
                    f.close()

    except KeyboardInterrupt:
        raise
ser.close()

For the first two bullets a sample output is like:

Waiting for data
$GPGGA,170609.941,5335.6665,N,01021.2637,E,1,09,01.1,35.9,M,40.2,M,,*58
Lat 5335.666500 Long 1021.263700
$GPGGA,170610.941,5335.6665,N,01021.2637,W,1,09,01.1,36.0,M,40.2,M,,*5A

With this code I got an error:

f.write(coord_list)
TypeError: write() argument must be str, not list   

I get stuck on saving coordinates under a CSV file. I couldn't figure out how to write a correct code to solve it. Whatever I tried I got another errors or nothing.

解决方案

The problem is as your error says, that write takes string only.
csv format is usually comma seperated.
So you could do like this :

f.write("{},{}\n".format(gpgga.latitude, gpgga.longitude))

Also you close the file in the loop, but dont open it. So it won't write after first loop.

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