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POHow to calculate the map span/zoom to include a set of GeoPoints in the viewport?
 

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  1. POHow to calculate the map span/zoom to include a set of GeoPoints in the viewport?
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    <p>I have a set of GeoPoints and want to find the Lat/Lon center and and spans that include all these GeoPoints (so they're visible all on the MapView).</p> <p>On a planar map this would be rather simple, find the highest and lowest x/y values, find the center by adding half of the absolute distance to the lower value.</p> <p>But how is this done for the spherical world map, where the max/min values of -180/+180 and +90/-90 are next to each other? </p> <p>Here's what I'm trying to do:</p> <pre><code>public void zoomToGeoPoints(GeoPoint... geoPoint) { MapController mc = getController(); if (geoPoint == null) { Log.w(TAG, "No geopoints passed, doing nothing!"); return; } // Set inverse max/min start values int maxLat = (int) (-90 * 1E6); int maxLon = (int) (-180 * 1E6); int minLat = (int) (90 * 1E6); int minLon = (int) (180 * 1E6); // Find the max/min values for (GeoPoint gp : geoPoint) { maxLat = Math.max(maxLat, gp.getLatitudeE6()); maxLon = Math.max(maxLon, gp.getLongitudeE6()); minLat = Math.min(minLat, gp.getLatitudeE6()); minLon = Math.min(minLon, gp.getLongitudeE6()); } // Find the spans and center point double spanLat = Math.abs(maxLat - minLat); double spanLon = Math.abs(maxLon - minLon); int centerLat = (int) ((minLat + spanLat / 2d)); int centerLon = (int) ((minLon + spanLon / 2d)); GeoPoint center = new GeoPoint(centerLat, centerLon); // Pan to center mc.animateTo(center); // Zoom to include all GeoPoints mc.zoomToSpan((int)(spanLat), (int)(spanLon)); </code></pre>
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    1. COVery similar to questions [Google MAP API v3: Center & Zoom on displayed markers](http://stackoverflow.com/questions/2818984/google-map-api-v3-center-zoom-on-displayed-markers), and the rather less informative [google map zoom to fit](http://stackoverflow.com/questions/11309914/google-map-zoom-to-fit).
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      1. USJim DeLaHunt
 

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