Introduction to Geo Technologies
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Yahoo Geo Technologies Things you might not know about. Chris&an Heilmann, Tech Talk ‐ Sunnyvale, Ca, 8/4/2010
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An introduction to all the geo technologies provided by Yahoo and how to use them to solve common geo problems.
Transcript of Introduction to Geo Technologies
Yahoo Geo Technologies
Things you might not know about.
Chris&an Heilmann, Tech Talk ‐ Sunnyvale, Ca, 8/4/2010
Geolocation is the new thing.
It is also big business.
Yahoo has amazing geo technology products.
And they work localised to outside the US.
Problem is that geo is hard-core Math.
There are a few different ingredients to playing with geo location.
Finding the current location.
Finding the current location.
Turning a location into a place.
Finding the current location.
Turning a location into a place.
Finding a geographical hierarchy.
Finding the current location.
Turning a location into a place.
Finding a geographical hierarchy.
Geo-tagging information.
Finding the current location.
Turning a location into a place.
Finding a geographical hierarchy.
Geo-tagging information.
Displaying geo information.
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Finding the current location happens in different ways.
The creepy way - IP sniffing.
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h=p://isithackday.com/hacks/geo/js‐loca&on.html
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The problem with IP sniffing is accuracy.
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The other problem: it is not reliable.
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The non-creepy and more accurate way - the W3C geolocation API.
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Firefox/(Mobile) Safari/Chrome (dev build)
Another way is of course to get location information from the user’s social presence.F
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Plazes, FireEagle, Twitter, Yahoo, Flickr, Foursquare, Gowalla, Brightkite, Google Buzz/Latitude, Dopplr...F
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Problem: none of this works in YAP applications.
Problem: none of this works in YAP applications.
Having a latitude and longitude is fine and dandy but it is ambiguous.
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The same lat/lon pair could be a lot of things - the centre of a town, a point of interest...
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This is why we need to turn lat/lon into something that is human readable.
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This is called reverse geocoding and there are a few services for it out there.
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My personal favourite (as it works world-wide) is the Flickr reverse geocoder.
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h=p://www.flickr.com/services/api/flickr.places.findByLatLon.html
You can use this using YQL:
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select * from flickr.places wherelat=51.5142271 and lon=‐0.1289602
To get more in-depth data, use flickr and Yahoo Geo:
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select * from geo.places where woeid in ( select place.woeid from flickr.places where lat=51.5142271 and lon=‐0.1289602)
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Whoa!!!
WOEID
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What’s around a certain location?
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h=p://developer.yahoo.com/geo/
GeoPlanet gives you hierarchies:
Parent, Ancestors, Children, Siblings, Neigbours, BelongTos.
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h=p://isithackday.com/geoplanet‐explorer/?woeid=615702
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h=p://isithackday.com/geoplanet‐explorer/geodrilldown.php
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Putting it all together, we can get this:
h=p://isithackday.com/hacks/geo/geotest.php
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What if you have no location but only a resource?
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h=p://developer.yahoo.com/geo/placemaker/Ge
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Placemaker takes a text, or a web URL and extracts the geographical information from it.
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. select * from geo.placemaker where documentContent = "Hey I am in Atlanta! I came here from London and will travel onwards to Las Vegas and Sao Paulo" and documentType="text/plain"
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. select * from geo.placemaker where documentURL ="h=p://icant.co.uk" and documentType="text/html" and appid=""
select * from geo.placemaker where documentURL ="h=p://newsrss.bbc.co.uk/rss/newsonline_uk_edi&on/front_page/rss.xml"and documentType="text/rss" and appid=""
Placemaker returns places and references - you can use these to enhance texts with geo information.
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To see Placemaker in action, check out the GeoMaker hack.
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h=p://github.com/codepo8/geomaker
h=p://icant.co.uk/geomaker/Ge
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Geonames IDISOFIPSINSEEJGDCIATAICAOWOEID
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Concordance
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http://isithackday.com/hacks/geo/geosetta.php
Displaying geo information is done via Map APIs
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By far the easiest way to build a very simple map is to use the Google static maps API.
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<img src=”h=p://maps.google.com/maps/api/sta&cmap?sensor=false&size=200x200&maptype=roadmap&key=YOUR_MAP_KEY&markers=color:blue|label:1|37.4447,‐122.161&markers=color:blue|label:2|37.3385,‐121.886&markers=color:blue|label:3|37.3716,‐122.038&markers=color:blue|label:4|37.7792,‐122.42” alt=””>
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If you want to use Yahoo Maps with the data returned from the earlier YQL calls here’s the code:
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If you want to use any map provider easily without deep-diving into an API, use Mapstraction.
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h=p://www.mapstrac&on.com/
Putting it all together...
Su
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http://isithackday.com/hacks/geo/yql-geo-library/
And the hacking continues...
h=p://delicious.com/tag/geotoys
Chris&an Heilmann h=p://wait‐&ll‐i.com h=p://developer‐evangelism.com h=p://twi=er.com/codepo8
Cheers
