documentclass	title	author
physycomen	nmea_to_json	Di Cristina, Fabbri, Sinigardi

Purpose

This tool has been written in order to convert NMEA data into our standard .json format for GNSS coordinates

Installation

CMake, boost and a C++11 compatible compiler are required. To build the executable, clone the repo and then type

mkdir build ; cd build ; cmake .. ; cmake --build .

With CMake you can also deploy projects for the most common IDEs.
Contains jsoncons as a git submodule.

Usage

nmea_to_json.exe -i input.txt -o output.json -f [output style, 'a' (no quotes) for array or 'o' for object]

where input.txt must be an existing NMEA ASCII-encoded file while output.json is the name of the output file.

The optional -f specifies the style of the output .json file. If omitted, the object-style will be used.

Input Samples

Sample #1

$GPRMC,135221.000,V,4429.94755,N,01121.18915,E,0.0,-18.4,300615,,E*40
$GPRMC,135222.000,V,4429.94755,N,01121.18915,E,0.0,-18.4,300615,,E*43

Sample #2

$GNRMC,140502.20,A,4430.12967,N,01121.89356,E,7.201,56.95,300615,,,A*40
$GNRMC,140503.00,A,4430.12729,N,01121.89572,E,9.035,58.54,300615,,,A*4F

Sample #3

$GNGGA,135148.00,4429.97640,N,01121.21051,E,1,08,1.63,41.9,M,45.5,M,,*7F
$GNGGA,135148.20,4429.97639,N,01121.21050,E,1,08,1.63,41.9,M,45.5,M,,*72

Output Sample

Object-style:

{
    "gps_record_0000001":
    {
        "lat":44.5021611,
        "lon":11.3648926
    },
    "gps_record_0000002":
    {
        "lat":44.5021381,
        "lon":11.3648768
    }
}

array-style:

[
    {
        "lat":44.5021611,
        "lon":11.3648926
    },
    {
        "lat":44.5021381,
        "lon":11.3648768
    }
]

More details about file formats is available here.