Tutorial :Real-time Data Visualization using any Earth API



Question:

How to create something like on this video (1-2 minutes http://www.ted.com/index.php/talks/sergey_brin_and_larry_page_on_google.html) using "Google Earth API" or some other?

Especially: I have an online game and want to show dynamical data on some "virtual earth". 3 types of objects changing their state in real-time. It's enough to update each 5 seconds. I already have open api for it.

The problem is i do not know if it's possible to draw something like colored lines from a sphere's center and change them dynamically.

Sorry for an abstract question, but the goal is the same.


Solution:1

Well, if you're using the Google Earth API (requires that the Google Earth Plugin be installed), you can just create a bunch of extruded polygons. For example, if you go to the Earth API Interactive Sampler and paste/run this:

var lookAt = ge.getView().copyAsLookAt(ge.ALTITUDE_RELATIVE_TO_GROUND);  var lat = lookAt.getLatitude();  var lng = lookAt.getLongitude();    // first create inner and outer boundaries  // outer boundary is a square  var outerBoundary = ge.createLinearRing('');  var coords = outerBoundary.getCoordinates();  coords.pushLatLngAlt(lat - 0.5, lng - 0.5, 1000000);   coords.pushLatLngAlt(lat - 0.5, lng + 0.5, 1000000);   coords.pushLatLngAlt(lat + 0.5, lng + 0.5, 1000000);   coords.pushLatLngAlt(lat + 0.5, lng - 0.5, 1000000);     // create the polygon and set its boundaries  var polygon = ge.createPolygon('');  polygon.setExtrude(true);  polygon.setAltitudeMode(ge.ALTITUDE_RELATIVE_TO_GROUND);  polygon.setOuterBoundary(outerBoundary);    // create the polygon placemark and add it to Earth  var polygonPlacemark = ge.createPlacemark('');  polygonPlacemark.setGeometry(polygon);  ge.getFeatures().appendChild(polygonPlacemark);    // persist the placemark for other interactive samples  window.placemark = polygonPlacemark;  window.polygonPlacemark = polygonPlacemark;  

You'll see a 3D polygon extruded out of the globe.

There's much more you can do with this; I suggest playing with the Earth API and KML (foundation for geometry primitives in the Earth API) by visiting code.google.com/apis/earth and code.google.com/apis/kml.


Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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