Wednesday, September 13, 2017

Wiring Leaflet, ESRI-leaflet, and Angular for a web map

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Basic prototype wiring to map geospatial information using Leaflet, ESRI-leaflet, Angular 4.  There are several nice examples out there, but it is a quick and dirty way of putting all things together and display the map using Angular/Cli.

Step 1. Generate an angular project from angular/cli
                ng new leafletPrototype

Step2. Install all dependencies
a.     Npm install leaflet --save
b.     Nmp install esri-leaflet --save
c.      Npm install @types/leaflet –save

Your pacakage.json will looks like –
"dependencies": {
    "@angular/common": "^4.0.0",
    "@angular/compiler": "^4.0.0",
    "@angular/core": "^4.0.0",
    "@angular/forms": "^4.0.0",
    "@angular/http": "^4.0.0",
    "@angular/platform-browser": "^4.0.0",
    "@angular/platform-browser-dynamic": "^4.0.0",
    "@angular/router": "^4.0.0",
    "@types/leaflet": "^1.0.69",
    "core-js": "^2.4.1",
    "esri-leaflet": "^2.1.1",
    "leaflet": "^1.2.0",
    "rxjs": "^5.1.0",
    "zone.js": "^0.8.4"
  },


Step 3. Configure .angular-cli.json
Add leaflet and esri-leaflet styles and scripts in .angular-cli.json
"styles": [
        "styles.scss",
        "../node_modules/leaflet/dist/leaflet.css",
        "../node_modules/leaflet-draw/dist/leaflet.draw.css"
      ],


      "scripts": ["../node_modules/leaflet/dist/leaflet.js",
        "../node_modules/esri-leaflet/dist/esri-leaflet.js"
      ],

Step 4. Now, run “ng serve” and see if any errors while importing leaflet libraries.

Thursday, March 3, 2016

Esri Leaflet Dynamic TileLayer Plugin Example

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While working in one my Esri-Leaflet based application, I am stumbled on rendering dynamic map layers on tiled basis. Esri leaflet-api does the perfect job on non-tiled layer display but L.esri.DynamicMapLayer, doesn’t provide the tiled dynamic map layers. Looking around I came across the Tiled dynamic layer plugin for esri-leaflet, for displaying the DynamicMapLayer in tiled mode.

Here I have created both non-tiled and tiled DynamicMapLayer version for comparison using plain esri-leaflet and esri-leaflet with plugin.


 

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