idris-lv03

A wrapper to use the swiss LV03 projection with leaflet

Setup

Create a folder myProject for your project

$ mkdir myProject
$ cd myProject

Install

Initialise npm and install idris-maps

$ npm init
$ npm install idris-lv03 --save

Copy the myProject/node_modules/idris-lv03/public folder to myProject/public

If watchify is not installed, install it

$ sudo npm install watchify -g

Create a main.js file and compile it into myProject/public/script.js with watchify

$ watchify main.js -o public/script.js

You can see the result by opening public/index.html

To publish on your server just copy the public folder

Use

In main.js, require idris-lv03

var lv03 = require('idris-lv03')

Initialise

Path to leaflets images folder

Set the path to the images folder, if it is in the same folder as index.html:

var imagePath = 'images'

Center and zoom level at start

Set the center and zoom level of the map at start

• In LV03 coordinates as x and y

var start = {
	x: 182273,
	y: 538745,
	zoom: 22
}

• In WGS84 coordinates as lat and lng

var start = {
	lat: 46.7888,
	lng: 6.6364,
	zoom: 22
}

Initialise with lv03.init()

Initialise the map with the start point and the imagePath. It returns a map variable.

lv03.init(start, imagePath, function(map) {
	// the rest of your code goes in here
})

Add WMS tiles

A WMS service needs the following keys:

• url the URL to the service
• format the format of the tiles, default is image/png
• attr proper attribution to the provider
• minZoom, default is 0
• maxZoom, default is 28

To add the r-pod_yverdon_cygnes layer from HEIGVD-WMS-RPOD for example

Create the configuration

var cygnes = {
	url: 'http://ogc.heig-vd.ch/mapserver/wms?',
	minZoom: 22,
	format: 'image/jpeg',
	attr: '© HEIG-VD'
}

... and add the layer with lv03.wms(map, [CONFIGURATION])

lv03.init(start, imagePath, function(map) {
	lv03.wms(map, cygnes)
})

WMS services that I know of that do not require authentification:

• VD-WMS list of layers
• HEIGVD-WMS-RPOD list of layers
• WMS-IFDG list of layers

Add features in WGS84 coordinates

Within the callback of lv03.init(), you can add any type of leaflet layer (such as L.marker(), L.geoJson() ...) with coordinates in WGS84

lv03.init(start, imagePath, function(map) {
	L.marker([46.7888,6.6364]).addTo(map)
})

Add a marker in LV03 coordinates

You can add a marker in LV03 coordinates using the lv03.point(map, coordinates) function where coordinates is an array with x and y: [x,y]

lv03.init(start, imagePath, function(map) {
	lv03.point(map, [182273,538745])
})