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gpx-interpolate

(★ 55)

Python function to interpolate GPX data using piecewise cubic Hermite splines

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- tests.txt
.gitignore
gpx_interpolate.py
LICENSE.md
plot.png
README.md
requirements.txt
test.sh

# Installation Guide

1. Get the code

git clone https://github.com/remisalmon/gpx-interpolate

Downloads the entire project code from GitHub to your computer.

cd gpx-interpolate

Moves into the project folder you just downloaded.

2. Python

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Python 3 On Windows, be sure to check 'Add Python to PATH' during installation.

pip install -r requirements.txt

Installs the Python libraries listed in requirements.txt (or similar).

python <실행할 파일명>.py # README에서 정확한 실행 파일명을 확인하세요

Runs the Python script (or module).

✅ If it runs without errors and prints output in the terminal, it worked.

// repository documentation

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# gpx_interpolate.py

Python script to interpolate GPX files using piecewise cubic Hermite splines.

Interpolates latitude, longitude, elevation and speed at any spatial resolution.

## Usage

### Script
```
usage: gpx_interpolate.py [-h] [-r RES] [-n NUM] [-s] FILE [FILE ...]

interpolate GPX files using piecewise cubic Hermite splines

positional arguments:
  FILE               GPX file

optional arguments:
  -h, --help         show this help message and exit
  -r RES, --res RES  interpolation resolution in meters (default: 1)
  -n NUM, --num NUM  force point count in output (default: disabled)
  -s, --speed        save interpolated speed
```

### Module
```python
from gpx_interpolate import gpx_interpolate

gpx_data = {'lat':lat,
            'lon':lon,
            'ele':ele,
            'tstamp':tstamp,
            'tzinfo':tzinfo}

gpx_data_interp = gpx_interpolate(gpx_data, res=1.0)
```

where:
* `lat`, `lon` are the trackpoints latitude and longitude (in degree)
* `ele` (optional) is the trackpoints elevation (in meter)
* `tstamp` (optional) is the trackpoints timestamps (in second)
* `tzinfo` (optional) is the trackpoints timezone as a `datetime.tzinfo` subclass instance (`None` for UTC)
* `res` is the interpolation resolution in meters (`1.0` by default, disabled if `num` is passed)
* `num` (optional) is the number of trackpoints of the interpolated data (`None` by default)

`ele`, `tstamp` and `tzinfo` are optional and can be set to `None`.

### Example
:black_circle: = input GPX data, :red_circle: = interpolated GPX data  
![plot.png](https://raw.githubusercontent.com/remisalmon/gpx-interpolate/master/plot.png)

## Test

Run `./test.sh`

## Requirements

```
gpxpy==1.5.0
scipy==1.8.0
numpy==1.22.2
```