ELAN NRW InVeKos API

Provides cropping data and geometries for the plots of a single farm through the agricultural direct aid program. The API is a (scraping) wrapper for the InVeKos download-portal of the Landwirtschaftskammer Nordrhein-Westfalen.

Installation

npm install elan-api

Usage example

const elanGet = require('elan-api')

elanGet('farmNo', 'password', {
  type: 'Verzeichnis',
  year: '2018'
})
.then(res => {
  // res is a string with the contents of the Flaechenverzeichnis.xml file provided by ELAN
})
.catch(err => {
  // connection errors, credentials etc...
})

Methods

The module exports one method. It takes the following arguments:

Name	Type	Example	Description
farmNo	string	'123456789'	The 12 digit Betriebsnummer (farm number), without the 3 starting digits (276, indicating NRW)
pass	string	'123456'	The 6 digit pin code associated to the Betriebsnummer
options	object	{ type: 'Verzeichnis', year: '2018' }	Optional. The options may contain a type (string) and and/or a year (string) property. The type may either be 'Verzeichnis' (returns Flaechenverzeichnis.xml) or Geometrien (returns 'Teilschlaggeometrien.xml'). If type is ommited, 'plots' will be returned. If the year property is omitted, the method will return the latest available InVeKos data.

Testing

In order to test, you need to place a credentials.json file in the spec folder. Also results from the Verzeichnis and Geometrien calls need to be saved as geometries.gml and respectively verzeichnis.xml in the test folder. The JSON needs to have the following structure, where the dummy values have to be replaced with a valid farmNo and password:

{
  "farmno": "123456789",
  "pass": "123456"
}

Once the file is created, you can run npm test in order to run the unit tests.

Contribution

Please feel free to submit an issue or a pull request.

License

MIT