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presentation.html
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presentation.html
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<!--
Adapted from google IO slide templates
Original Authors: Eric Bidelman <ebidel@gmail.com>
Luke Mahé <lukem@google.com>
URL: https://code.google.com/p/io-2012-slides
-->
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">-->
<!--<meta name="viewport" content="width=device-width, initial-scale=1.0">-->
<!--This one seems to work all the time, but really small on ipad-->
<!--<meta name="viewport" content="initial-scale=0.4">-->
<meta name="apple-mobile-web-app-capable" content="yes">
<link rel="stylesheet" media="all" href="/static/theme/css/default.css">
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="/static/theme/css/phone.css">
<base target="_blank"> <!-- This amazingness opens all links in a new tab. -->
<script data-main="/static/js/slides/slides" src="/static/js/slides/require-1.0.8.min.js"></script>
<script src="/static/lib/js/leaflet-src.js"></script>
</head>
<body style="opacity: 0">
<slides class="layout-widescreen">
<slide class="title-slide dark">
</slide>
<slide class="title-slide segue nobackground">
<!-- The content of this hgroup is replaced programmatically through the slide_config.json. -->
<img src="/static/css/leaflet.png" class="reflect" alt="Screenshot of Leaflet Map" title="A Leaflet Map">
<hgroup class="auto-fadein">
<h1 data-config-title><!-- populated from slide_config.json --></h1>
<h2 data-config-subtitle><!-- populated from slide_config.json --></h2>
<p data-config-presenter><!-- populated from slide_config.json --></p>
</hgroup>
</slide>
<slide>
<hgroup>
<h2>Getting started with leaflet</h2>
</hgroup>
<article>
<p>"Leaflet is a modern open-source JavaScript library for mobile-friendly interactive maps." ~ <a href="http://leafletjs.com/">http://leafletjs.com/</a></p>
<ul>
<li>Walkthrough basic leaflet maps
<ul>
<li>Single tilelayer</li>
</ul>
<ul>
<li>Multiple tilelayer with selection dropdown</li>
</ul>
<ul>
<li>Adding points + polygons with geojson</li>
</ul>
<ul>
<li>Using leaflet plugins</li>
</ul>
</li>
<li>Ask Questions</li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>Getting Started</h2>
</hgroup>
<article>
<ul>
<li>Download files from github: <a href="http://github.com/notthatbreezy/leaflet-tutorial">github.com/notthatbreezy/leaflet-tutorial</a></li>
<li>Start a webserver to serve files from repository
<ul>
<li>Download cross-platform one written in Go: <a href="https://github.com/notthatbreezy/simple-go-fileserver/releases">https://github.com/notthatbreezy/simple-go-fileserver/releases</a>
<ul>
<li><a href="https://github.com/notthatbreezy/simple-go-fileserver/releases/download/v1.0/simple-fileserver.exe">Windows (64-bit)</a></li>
<li><a href="https://github.com/notthatbreezy/simple-go-fileserver/releases/download/v1.0/simple-fileserver-mac">Mac (64-bit)</a></li>
<li><a href="https://github.com/notthatbreezy/simple-go-fileserver/releases/download/v1.0/simple-fileserver">Linux (64-bit)</a></li>
</ul>
</li>
<li>Move executable to same directory where tutorial files are</li>
<li>Open a terminal, navigate to directory, and run executable</li>
<li>Open a browser and go to <a href="http://localhost:9090">http://localhost:9090</a></li>
</ul>
</li>
<li>Follow presentation from website: <a href="http://notthatbreezy.com/leaflet-tutorial/presentation.html">notthatbreezy.com/leaflet-tutorial/presentation.html</a></li>
</ul>
</article>
</slide>
<slide>
<hgroup>
<h2>A Basic Leaflet Map</h2>
</hgroup>
<article>
<pre class="prettyprint" data-lang="html">
<html>
<head>
<title>A Leaflet map!</title>
<b><!-- Load leaflet javascript and CSS files -->
<link rel="stylesheet" href="/static/lib/css/leaflet.css"/>
<script src="/static/lib/js/leaflet-src.js"></script></b>
</head>
<body>
<!-- Load CSS for page -->
<link rel="stylesheet" href="/static/css/main.css"/>
<b><div id="basic-map">Leaflet</div></b>
</body>
<footer>
<b><!-- Load javascript to display map -->
<script src="/static/js/basic.js"></script></b>
</footer>
</html>
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>A Basic Leaflet Map</h2>
</hgroup>
<br>
<pre class="prettyprint" data-lang="javascript">
/**
* Initialize the map on the page
* - need an empty div with an id to insert map into
* - setView centers the map on coordinates (Philly City Hall)
*/
<b>var map = L.map('basic-map').setView([39.952299, -75.163256], 13);</b>
/**
* Add OpenStreetMap tiles to the map
*
* There are many open-source, freely available tiles
* for leaflet.
* See: http://leaflet-extras.github.io/leaflet-providers/preview/
*/
<b>L.tileLayer('http://{s}.www.toolserver.org/tiles/bw-mapnik/{z}/{x}/{y}.png', {
attribution: '© <a href="http://openstreetmap.org">OpenStreetMap</a>' +
'<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'
}).addTo(map);</b>
</pre>
</slide>
<slide>
<hgroup>
<h2>A Basic Leaflet Map</h2>
</hgroup>
<article>
<iframe data-src="basic.html" style="height:500px;"></iframe>
<a href="basic.html">Link</a>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Multiple Layers</h2>
</hgroup>
<br>
<pre class="prettyprint" data-lang="javascript">
// Basemap Layers
var natGeoLayer = L.tileLayer('http://server.arcgisonline.co...ile/{z}/{y}/{x}', {
attribution: 'Tiles © Esri — National...',
maxZoom: 16
});
var mapQuestOpenAerial = L.tileLayer('http://oatile{s}.mqcdn.co.../{z}/{x}/{y}.jpg', {
attribution: 'Tiles Courtesy of <a href="http://www.mapquest.com/">MapQuest</a> ...',
subdomains: '1234'
});
// Weather Layers
var cloudLayer = L.tileLayer('http://{s}.tile.openweathermap.../{z}/{x}/{y}.png', {
attribution: 'Map data © <a href="http://openweathermap.org">OpenWeatherMap</a>',
opacity: 0.7
});
...
var pressureCountourLayer = L.tileLayer('http://{s}.tile.openwea...ntr/{z}/{x}/{y}.png', {
attribution: 'Map data © <a href="http://openweathermap.org">OpenWeatherMap</a>',
opacity: 0.5
});
</pre>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Multiple Layers</h2>
</hgroup>
<br>
<pre class="prettyprint" data-lang="javascript">
// Create Map
var map = L.map('basic-map', {
center: [39.952299, -75.163256],
zoom: 5,
layers: [natGeoLayer, cloudLayer]
});
// Create LayerGroups
var baseMaps = {
"ESRI National Geographic": natGeoLayer,
"MapQuest Open Aerial": mapQuestOpenAerial
}
var weatherMaps = {
"Clouds": cloudLayer,
"Precipitation": precipitationLayer,
"Pressure": pressureCountourLayer
};
<b>L.control.layers(baseMaps, weatherMaps).addTo(map);</b>
</pre>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Multiple Layers</h2>
</hgroup>
<article>
<iframe data-src="multiple-layers.html" style="height:500px;"></iframe>
<a href="multiple-layers.html">Link</a>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Points</h2>
</hgroup>
<article class="smaller">
<pre class="prettyprint" data-lang="javascript">
L.geoJson(geojsonFeature, options).addTo(map);
</pre>
<p>Able to customize how features are drawn on the map by <a href="http://leafletjs.com/reference.html#geojson-options">editing options objects</a></p>
<pre class="prettyprint" data-lang="javascript">
var <b>cornucopiaIcon</b> = L.icon({
iconUrl: 'lib/images/cornucopia.png',
iconSize: [60,50]
});
var <b>createMarker</b> = function(feature, latlng) {
var marker = L.marker(latlng, <b>{icon: cornucopiaIcon}</b>);
marker.bindPopup('<b>' + feature.properties.NAME + '</b><br/>' +
feature.properties.ADDRESS + '<br/>' +
feature.properties.DAY_TIME)
return marker
}
var displayFarmersMarkets = function(data) {
<b>L.geoJson(data, {
pointToLayer: createMarker
})</b>.addTo(map);
}
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Geojson</h2>
</hgroup>
<article class="smaller">
<p>Standardizes representing <a href="http://geojson.org/geojson-spec.html">geospatial data using JSON</a>.</p>
<pre class="prettyprint" data-lang="javascript">
{
"type": <b>"FeatureCollection"</b>,
"features": [
{
<b>"geometry": {
"type": "Point",
"coordinates": [
-75.15351422696591,
40.0642869592902
]
}</b>,
"type": "Feature",
"id": 1,
<b>"properties": {
"DAY_TIME": "Tu 2-6",
"NAME": "West Oak Lane",
"ADDRESS": "72nd Ave and Ogontz Ave, 19138"
}</b>
}
]
}
</pre>
<p>Use <a href="http://geojsonlint.com/">GeoJSONLint</a> to check for syntax errors</p>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Points</h2>
</hgroup>
<article>
<iframe data-src="points.html" style="height:500px;"></iframe>
<a href="points.html">Link</a>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Polygons</h2>
</hgroup>
<article class="smaller">
<p>Can use <a href="http://jquery.com/">jQuery</a> to load external data</p>
<pre class="prettyprint" data-lang="javascript">
$.getJSON( url [, data ] [, success ])
</pre>
<p>This may look a little weird, especially if you are used to programming in python or ruby<p>
<pre class="prettyprint" data-lang="python">
r = requests.get(url)
json_data = r.json()
# do something with json
...
</pre>
<p>Browsers cannot wait for a response, preventing other computations</p>
<pre class="prettyprint" data-lang="javascript">
var neighborhoodsURL = "static/data/neighborhoods.geojson"
$.getJSON(neighborhoodsURL, <b>function(data) {
L.geoJson(data, {
onEachFeature: function(feature, layer) {
layer.bindPopup(feature.properties.listname)
}
}</b>).addTo(map)
});
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Polygons</h2>
</hgroup>
<article>
<iframe data-src="polygons.html" style="height:500px;"></iframe>
<a href="polygons.html">Link</a>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Plugins</h2>
</hgroup>
<article class="smaller">
<p>Leaflet has <a href="http://leafletjs.com/plugins.html">many plugins</a> that extend its functionality</p>
<ul>
<li><a href="https://github.com/mapbox/leaflet-omnivore">Omnivore</a> - parses other data formats beside GeoJSON</li>
<li><a href="https://github.com/Leaflet/Leaflet.markercluster">Markercluster</a> - Clusters markers on the map</li>
</ul>
<pre class="prettyprint" data-lang="html">
<!-- Load leaflet marker cluster plugin files -->
<link rel="stylesheet" href="/static/lib/css/MarkerCluster.Default.css"/>
<link rel="stylesheet" href="/static/lib/css/MarkerCluster.css"/>
<script src="/static/lib/js/leaflet.markercluster.js"></script>
<!-- Load leaflet omnivore plugin.js -->
<script src="//api.tiles.mapbox.com/mapbox.js...-omnivore/v0.1.2/leaflet-omnivore.min.js"></script>
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Plugins</h2>
</hgroup>
<article class="smaller">
<p>Using omnivore to load a CSV is very similar to loading GeoJSON</p>
<pre class="prettyprint" data-lang="javascript">
var bikeRacks = omnivore.csv('/data/bike_racks.csv',
null, bikeRacksLayer)
<b>.on('ready'</b>, function() {
// Zoom map to extent
map.fitBounds(bikeRacks.getBounds());
// Create a marker cluster group
<b>var markers = L.markerClusterGroup({
showCoverageOnHover: false,
maxClusterRadius: 50
});
// Add markers to cluster group
markers.addLayer(bikeRacks);</b>
// Add layer to map
map.addLayer(markers);
});
</pre>
</article>
</slide>
<slide>
<hgroup>
<h2>Leaflet Map with Plugins</h2>
</hgroup>
<article>
<iframe data-src="leaflet-plugins-example.html" style="height:500px;"></iframe>
<a href="leaflet-plugins-example.html">Link</a>
</article>
</slide>
<slide>
<hgroup>
<h2>Data Resources</h2>
</hgroup>
<article>
<p><a href="http://www.opendataphilly.org/">Open Data Philly</a></p>
<p><a href="https://github.com/CityOfPhiladelphia/phl-open-geodata">PHL Open Geodata</a></p>
<p><a href="http://www.pasda.psu.edu/">Pennsylvania Geospatial Data Clearinghouse</a></p>
</article>
</slide>
<slide>
<hgroup>
<h2>Map + Javascript Resources</h2>
</hgroup>
<article>
<p><a href="http://leafletjs.com/reference.html">Leaflet Reference</a></p>
<p><a href="http://maptimeboston.github.io/leaflet-intro/">Maptime Boston Leaflet Intro</a></p>
<p><a href="https://www.mapbox.com/mapbox.js/api/v2.1.0/">Mapbox JS</a></p>
<p><a href=""></a></p>
</article>
</slide>
<slide class="thank-you-slide segue nobackground">
<article class="flexbox vleft auto-fadein">
<h2>Like Maps?</h2>
<h3>Azavea is Hiring! <a style="color:black;" href="http://jobs.azavea.com/">http://jobs.azavea.com/</a></h3>
<h3>Check out GeoPhilly <a style="color:black;" href="http://www.meetup.com/GeoPhilly/">http://www.meetup.com/GeoPhilly/</a></h3>
</article>
<p class="auto-fadein" data-config-contact>
<!-- populated from slide_config.json -->
</p>
</slide>
<slide class="backdrop"></slide>
</slides>
<!--[if IE]>
<script src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script>
<script>CFInstall.check({mode: 'overlay'});</script>
<![endif]-->
</body>
</html>