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Incorporating Google Maps and Google Earth into your Remote Sensing Applications J. Freemantle OARS Technical Meeting, Dec 11, 2006
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Outline Overview of Google Earth Simple examples using keyhole markup language (kml) Using the Google Maps/Earth API Some community examples Questions?
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Google Earth Client/Server Application Free for basic version Works on Windows (2000/XP), Mac OS 10.3.9, Linux
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Google Earth Overview Satellite and Airborne Imagery 1-3 years old Spatial resolution in countryside < 15 m. Major US cities less than 1-2 feet (20-40 cm). Parts of Manhattan (Fulton Co.) 10 cm!
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York University
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Newmarket
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Low vs high res. data (Aurora)
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Toronto
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New York City (20 cm)
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New York City (10 cm)
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10 and 20 cm images compared
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Primary Data (roads etc)
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Boundary Errors
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Why Google? Its free!!! Generally up to date Large user community Developer/programmer friendly Easy to learn Platform independent Its cool!
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Assumptions/Caveats Check the fine print of End User License (EUL) for your situation. Google Earth 4.0 (Beta), free version. Public/Private data? (choose wisely).
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Simple Examples using KML Point Pictures Tracks Overlays Links to external data
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Warning Code Examples!
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Keyhole Markup Language (kml) Xml grammar and file format for describing geographic features in google earth/maps Points Lines Polygons Models links
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Keyhole Markup Language (KML) KML files can be shared. KMZ files are a compressed version of KML files. Google Earth processes kml files like web browsers process html files.
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Kml example: Simple point OARS Meeting Presented by Jim Freemantle Dec 11, 2006 7:00 pm Room 129 Chemistry Building, York University, Toronto. ]]> -79.508,43.773225,0
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Simple Point
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Simple point, with link OARS Meeting details http://www.oars.on.ca ]]> -79.508,43.773225,0
![Simple point, with link OARS Meeting details ]]> , ,0](http://images.slideplayer.com./1/6615/slides/slide_24.jpg "Simple point, with link OARS Meeting details ]]> , ,0")
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Simple point with link
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Simple point, with image OARS Meeting details http://www.oars.on.ca ]]> -79.508,43.773225,0
![Simple point, with image OARS Meeting details ]]> , ,0](http://images.slideplayer.com./1/6615/slides/slide_26.jpg "Simple point, with image OARS Meeting details ]]> , ,0")
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Simple point with image
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Track t0490f13 t0490f13 ]]> -68.8911,48.79734,2470.74 -68.8947,48.79449,2471.35 -68.9127, 48.78028,2466.96,-68.9164,48.77747,2469.82
![Track t0490f13 t0490f13 ]]> , , , , , , , , ,](http://images.slideplayer.com./1/6615/slides/slide_28.jpg "Track t0490f13 t0490f13 ]]> , , , , , , , , ,")
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Track
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GeoTagging
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Requirements GPS device Camera with EXIF format jpg files and internal clock Software to sync gps track with time of photo Software to create google earth file (.kml)
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GeoTagging GPS Devices Used Sony GPS-SC1 ($129.00) Garmin Forerunner 201 Runners GPS ($159.00)
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GeoTagging Software Used GPSBabel (NMEA to GPX) GPS Image Tracker (Sony) (Not required) iTag
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GeoTagging
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Overlays Getting your georeferenced data into Google Earth Need georeferenced data Manually imported, as a jpg image, and matched to Google Earth
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Overlays
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Links Images External websites via url Databases
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Track with link t0489f06 t0489f06 Link to Flight Log ]]> -68.8911,48.79734,2470.74 -68.8947,48.79449,2471.35 -68.9127, 48.78028,2466.96,-68.9164,48.77747,2469.82
![Track with link t0489f06 t0489f06 Link to Flight Log ]]> , , , , , , , , ,](http://images.slideplayer.com./1/6615/slides/slide_42.jpg "Track with link t0489f06 t0489f06 Link to Flight Log ]]> , , , , , , , , ,")
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Track with link
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Point with link Waskesiu <![CDATA[Aeronet Sites Worldwide <a href="http://aeronet.gsfc.nasa.gov/cgi-bin/ type_one_station_opera_v2_new?site=Waskesiu&nachal=2&aero_water=0&level=1 &if_day=0&year_or_month=0">Link to Waskesiu data ]]> -106.083,53.916698,550
![Point with link Waskesiu <![CDATA[Aeronet Sites Worldwide <a href= type_one_station_opera_v2_new site=Waskesiu&nachal=2&aero_water=0&level=1 &if_day=0&year_or_month=0 >Link to Waskesiu data ]]> , ,550](http://images.slideplayer.com./1/6615/slides/slide_44.jpg "Point with link Waskesiu <![CDATA[Aeronet Sites Worldwide <a href= type_one_station_opera_v2_new site=Waskesiu&nachal=2&aero_water=0&level=1 &if_day=0&year_or_month=0 >Link to Waskesiu data ]]> , ,550")
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Point with Link
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Google Earth/Map Application Programmer Interface (API) Sign up for your key Can be used only on requested web accessible directory eg. http://www.example.com/gmaps http://www.example.com/gmaps Receive example script and put it in that directory Build Google Map applications from there
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> Jim's Google Maps JavaScript API Example from M. Brown <script src="http://maps.google.com/maps?file=api&v=2&key=xxx" type="text/javascript"> //<![CDATA[ var largemapcontrol = new GLargeMapControl(); function load() { if (GBrowserIsCompatible()) { var map = new GMap(document.getElementById("map")); GEvent.addListener(map,'click',function(overlay,point) { var latLngStr = '(' + point.x + ', '+ point.y + ') '; var message = document.getElementById("message"); message.innerHTML = latLngStr; }); map.centerAndZoom(new GPoint(-79.505, 43.77382), 4); map.addControl(largemapcontrol); } //]]>
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Google Map API
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Google Earth API Link to dynamically generated kml No API key required See http://earth.google.com/kml/kml_tut.ht ml#tracking_point
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Google Earth Example <?php // get the time $timesnap = date("H:i:s"); $BOX=$_GET[BBOX]; // split the client's BBOX return by commas and spaces to obtain an array of coordinates $coords = preg_split('/,|\s/', $BOX); // for clarity, place each coordinate into a clearly marked bottom_left or top_right variable $bl_lon = $coords[0]; $bl_lat = $coords[1]; $tr_lon = $coords[2]; $tr_lat = $coords[3]; // calculate the approx center of the view -- note that this is innaccurate if the user is not looking straight down $userlon = (($coords[2] - $coords[0])/2) + $coords[0]; $userlat = (($coords[3] - $coords[1])/2) + $coords[1]; $response = ' '; $response.= ' '; $response.= ' '.$timesnap.' '; $response.= ' '; $response.= " $userlon,$userlat,0 "; $response.= ' '; echo $response; ?>
![Google Earth Example < php // get the time $timesnap = date( H:i:s ); $BOX=$_GET[BBOX]; // split the client s BBOX return by commas and spaces to obtain an array of coordinates $coords = preg_split( /,|\s/ , $BOX); // for clarity, place each coordinate into a clearly marked bottom_left or top_right variable $bl_lon = $coords[0]; $bl_lat = $coords[1]; $tr_lon = $coords[2]; $tr_lat = $coords[3]; // calculate the approx center of the view -- note that this is innaccurate if the user is not looking straight down $userlon = (($coords[2] - $coords[0])/2) + $coords[0]; $userlat = (($coords[3] - $coords[1])/2) + $coords[1]; $response = ; $response.= ; $response.= .$timesnap. ; $response.= ; $response.= $userlon,$userlat,0 ; $response.= ; echo $response; >](http://images.slideplayer.com./1/6615/slides/slide_50.jpg "Google Earth Example < php // get the time $timesnap = date( H:i:s ); $BOX=$_GET[BBOX]; // split the client s BBOX return by commas and spaces to obtain an array of coordinates $coords = preg_split( /,|\s/ , $BOX); // for clarity, place each coordinate into a clearly marked bottom_left or top_right variable $bl_lon = $coords[0]; $bl_lat = $coords[1]; $tr_lon = $coords[2]; $tr_lat = $coords[3]; // calculate the approx center of the view -- note that this is innaccurate if the user is not looking straight down $userlon = (($coords[2] - $coords[0])/2) + $coords[0]; $userlat = (($coords[3] - $coords[1])/2) + $coords[1]; $response = ; $response.= ; $response.= .$timesnap. ; $response.= ; $response.= $userlon,$userlat,0 ; $response.= ; echo $response; >")
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Examples from the Community Mashups
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Acknowledgements Data providers J. Miller (York U), A. Smith (Agr. Canada) Colleagues I. Lumb, L. Gray
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Resources http://earth.google.com http://maps.google.com http://www.oars.on.ca Hacking Google Maps and Google Earth by Martin C. Brown Check back on the OARS website for a copy of these slides and list url of useful links
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Resources Interesting links GeoTagging "adding location information to pictures" http://www.iceburnslair.com/mapper/ http://wwmx.org/Download.aspx http://www.oziphototool.com// http://www.gpsbabel.org/ http://itagsoftware.awswa.com/ Interesting discussion at Canadian Canoe Routes on this topic: http://www.myccr.com/SectionForums/viewtopic.php?p=183038 Mashups: http://www.beerhunter.ca/OttawaArea http://googlemapsmania.blogspot.com/
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Questions?
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