Fun with Maps and PHP

FUN WITH MAPS & PHPChris Shiflett — @shiflett — shiflett.org

Who am I? Web aficionado, author, blogger, soccer player, bike rider, beer drinker, music lover, Brooklynite.

0. Landice

Dettifoss

TRAVELOG

Tag everything– #landice

Blog– every night

Timeline Visualizations– maps?

A!regate and Plot– photos, tweets, videos, etc.

1. Research

Sjónarsker

EXISTING TOOLS

GPS– Garmin GPS 60CSx

GPSBabel– gpsbabel.org

EveryTrail– everytrail.com

HoudahGeo– houdah.com/houdahGeo/

2. Reykjavík

Stóra-Víti

3. Photos

Kirkjufell

<?xml version="1.0" encoding="UTF-8"?><gpx version="1.0" creator="GPSBabel - http://gpsbabel.org/" xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns="http://topografix.com/GPX/1/0" xsi:schemaLocation="http://topografix.com/GPX/1/0 http://topografix.com/GPX/1/0/gpx.xsd"><time>2009-06-14T23:52:23Z</time><bounds minlat="64.143006038" minlon="-21.955686333" maxlat="64.153455254" maxlon="-21.915427381"/><trk> <name>14-JUN-09 01</name><number>1</number><trkseg><trkpt lat="64.150910676" lon="-21.946594650"> <ele>13.115112</ele> <time>2009-06-14T21:01:25Z</time></trkpt><trkpt lat="64.150785115" lon="-21.945423950"> <ele>13.595825</ele> <time>2009-06-14T21:02:08Z</time></trkpt></trkseg></trk></gpx>

$xml = simplexml_load_file('trip.gpx'); foreach($xml->trk as $part) { foreach ($part->trkseg->trkpt as $point) { /* $point['lat'] $point['lon'] $point->time $point->ele */ }}

PARSING GPX

4. Maps

Bláa lónið

HoudahGeo

Garmin GPS 60CSx Nikon D300

EVERYTRAIL

$query = $db->prepare("SELECT lat, lon FROM points WHERE timestamp > '$start' AND timestamp < '$end' ORDER BY timestamp");$query->execute();

$points = array();

while ($row = $query->fetch()) { $points[] = array('lat' => $row['lat'], 'lon' => $row['lon']);}

$trip['points'] = $points;$json = json_encode($trip);file_put_contents("/tmp/landice-$day.json", $json);

// FIXME: http://tr.im/selectclosest$sql = "SELECT lat, lon, elevation, ABS(timestamp - :timestamp) as distance FROM points ORDER BY distance LIMIT 1"$select = $this->db->prepare($sql); foreach ($this->photos as $photo) { $id = (string)$photo['id'];  // Get lat and lon from points table. $select->execute(array('timestamp' => $photo['timestamp'])); $row = $select->fetch(); $this->photos[$id]['lat'] = $row['lat']; $this->photos[$id]['lon'] = $row['lon']; $this->photos[$id]['elevation'] = $row['elevation'];}

$flickrMethod = 'flickr.photos.getInfo';$apiUrl = "http://api.flickr.com/services/rest/?method={$flickrMethod}&api_key={$this->apiKey}&photo_id={$id}";$xml = simplexml_load_file($apiUrl); $title = (string)$xml->photo->title;$desc = (string)$xml->photo->description;

FLICKR API

Google Maps OpenStreetMaps

5. Challenges

Stykkishólmur

CLUSTERS

20,000 points loaded on a single map is very slow

You don’t need a# points for every view

Mature solutions exist–http://tr.im/polyline

PERFORMANCE

6. Storytelling

Reykjavík

7. Future

Tjörnin

TRAILS

GPX Tracking

GEOLOCATION API

http://mozi#a.com/en-US/firefox/geolocation/http://dev.w3.org/geo/api/spec-source.html

Click here

Fo#ow me on Twitter– @shiflett

Comment on my blog– shiflett.org

Email me– chris@shiflett.org

FEEDBACK?

Chris Shiflett — @shiflett — shiflett.org

Thanks for listening!