从NMEA日志文件中提取的坐标保存在CSV文件中

从NMEA日志文件中提取的坐标保存在CSV文件中

本文介绍了从NMEA日志文件中提取的坐标保存在CSV文件中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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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08-01 05:05