node-red-contrib-web-worldmap

A Node-RED node to provide world map web page for plotting "things" on.

Changes

• v1.0.12 - Added ability to set initial start position, zoom level and base map layer.
• v1.0.x - now uses socket.io to connect to backend - means this node now has an input connection (like "proper" nodes should :-), and you no longer need a websocket node in parallel. Obviously this is a breaking change hence the major version number bump. Also thus adds a worldmap in node to handle events coming from the map interaction.

Install

Run the following command in your Node-RED user directory - typically ~/.node-red

    npm install node-red-contrib-web-worldmap

### Usage

Plots "things" on a map. The map will be served from {httpRoot}/worldmap

The minimum msg.payload must contain name, lat and lon properties, e.g.

    {name:"Joe", lat:51, lon:-1.05}

name must be a unique identifier across the whole map. Repeated location updates to the same name move the point.

Optional properties include

• layer : specify a layer on the map to add marker to.
• speed : combined with bearing, draws a vector.
• bearing : combined with speed, draws a vector.
• accuracy : combined with bearing, draws a polygon of possible direction.
• icon : font awesome icon name.
• iconColor : Standard CSS color name or #rrggbb hex value.
• photoUrl : adds an image pointed at by the url to the popup box.
• deleted : set to true to remove the named marker. (default false)

Any other msg.payload properties will be added to the icon popup text box.

You may select any of the Font Awesome set of icons. However there are several specials...

• plane : a plane icon that aligns with the bearing of travel.
• ship : a ship icon that aligns with the bearing of travel.
• car : a car icon that aligns with the bearing of travel.
• locate : a 4 corner outline to locate a point without obscuring it.
• friend : pseudo Nato style blue rectangle.
• hostile : pseudo Nato style red circle.
• neutral : pseudo Nato style green square.
• unknown : pseudo Nato style yellow square.
• earthquake : black circle - diameter proportional to magnitude.

Areas and Lines

If the payload contains an area property - that is an array of co-ordinates, e.g.

[ [51.05, -0.08], [51.5, -1], [51.2, -0.047] ]

then rather than draw a point and icon it draws the polygon. Likewise if it contains a line property it will draw the polyline.

• iconColor : can set the colour of the polygon or line.
• name : is used as the id key - so can be redrawn/moved.
• layer : declares which layer you put it on..

Drawing

A single right click will allow you to add a point to the map - you must specify the name and optionally the icon and layer.

Right-clicking on an icon will allow you to delete it.

If you select the drawing layer you can also add polylines, polygons and rectangles.

All these events generate messages that can be received by using a worldmap in node. For example:

{ "action": "connected" }
{ "action": "point", "lat": "50.60634", "lon": "-1.66580", "point": "joe,male,mylayer" }
{ "action": "delete", "name": "joe" }
{ "action": "layer", "name": "Esri Satellite" }
{ "action": "draw", "type": "rectangle", "points": [ { "lat": 50.61243889044519, "lng": -1.5913009643554688 }, { "lat": 50.66665471366635, "lng": -1.5913009643554688 }, { "lat": 50.66665471366635, "lng": -1.4742279052734375 }, { "lat": 50.61243889044519, "lng": -1.4742279052734375 } ] }

Control

You can also control the map via the node, by sending in a msg.payload containing a command object.

Optional properties include

• lat - move map to specified latitude.
• lon - move map to specified longitude.
• zoom - move map to specified zoom level (1 - world, 13 to 20 max zoom depending on map).
• layer - set map to specified layer name.
• map - Object containing details of a new map layer:
  • name - name of the map base layer OR overlay - name of overlay layer
  • url - url of the map layer
  • opt - options object for the new layer

For example

To switch layer, move map and zoom

    msg.payload.command =  {layer:"Esri Relief", lat:51, lon:3, zoom:10 };

To add a new base layer

    msg.payload.command.map = {
        name:"OSMhot",
        url:'http://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png',
        opt:{ maxZoom:19, attribution:"© OpenStreetMap" }
    };

Demo Flow

The following example gets recent earthquakes from USGS, parses the result, formats up the msg as per above and sends to the node to plot on the map. It also shows how to zoom and move the map or add a new layer.

    [{"id":"f7950c21.019f5","type":"worldmap","z":"896b28a8.437658","name":"","x":670,"y":680,"wires":[]},{"id":"bb057b8a.4fe2c8","type":"inject","z":"896b28a8.437658","name":"","topic":"","payload":"","payloadType":"none","repeat":"","crontab":"","once":false,"x":110,"y":640,"wires":[["b8545e85.5ba4c"]]},{"id":"b8545e85.5ba4c","type":"function","z":"896b28a8.437658","name":"add new layer","func":"msg.payload = {};\nmsg.payload.command = {};\n\nvar u = 'http://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png';\nvar o = JSON.stringify({ maxZoom: 19, attribution: '© OpenStreetMap'});\n\nmsg.payload.command.map = {name:\"OSMhot\", url:u, opt:o};\nmsg.payload.command.layer = \"OSMhot\";\n\nreturn msg;","outputs":1,"noerr":0,"x":340,"y":640,"wires":[["f7950c21.019f5"]]},{"id":"e6cc0a05.14edd8","type":"function","z":"896b28a8.437658","name":"USGS Quake monitor csv re-parse","func":"msg.payload.lat = msg.payload.latitude;\nmsg.payload.lon = msg.payload.longitude;\nmsg.payload.layer = \"earthquake\";\nmsg.payload.name = msg.payload.id;\nmsg.payload.icon = \"globe\";\nmsg.payload.iconColor = \"orange\";\n\ndelete msg.payload.latitude;\ndelete msg.payload.longitude;\t\nreturn msg;","outputs":1,"noerr":0,"x":460,"y":780,"wires":[["f7950c21.019f5"]]},{"id":"84b8388.5e943c8","type":"function","z":"896b28a8.437658","name":"move and zoom","func":"msg.payload = { command:{layer:\"Esri Terrain\",lat:0,lon:0,zoom:3} };\nreturn msg;","outputs":1,"noerr":0,"x":340,"y":680,"wires":[["f7950c21.019f5"]]},{"id":"5c317188.d2f31","type":"csv","z":"896b28a8.437658","name":"","sep":",","hdrin":true,"hdrout":"","multi":"one","ret":"\\n","temp":"","x":310,"y":720,"wires":[["e6cc0a05.14edd8"]]},{"id":"cfafad11.2f299","type":"inject","z":"896b28a8.437658","name":"","topic":"","payload":"","payloadType":"none","repeat":"","crontab":"","once":false,"x":110,"y":680,"wires":[["84b8388.5e943c8"]]},{"id":"f0d75b03.39d618","type":"http request","z":"896b28a8.437658","name":"","method":"GET","url":"http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.csv","x":190,"y":780,"wires":[["5c317188.d2f31"]]},{"id":"87da03a.eb8a3","type":"inject","z":"896b28a8.437658","name":"Quakes","topic":"","payload":"","payloadType":"none","repeat":"900","crontab":"","once":false,"x":120,"y":720,"wires":[["f0d75b03.39d618"]]}]

Car icon made by Freepik from www.flaticon.com is licensed by CC 3.0 BY.