Difference between revisions of "Cache alerts"
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== GCA Cache Alerts == | == GCA Cache Alerts == | ||
| − | GCA Cache Alerts will alert you to the status of selected caches within a selected radius from your home co-ordinates. For each cache type that is available at Geocaching Australia you can set a radius and alternative email address to be notified. | + | GCA Cache Alerts will alert you to the status of selected caches within a selected radius* from your home co-ordinates. For each cache type that is available at Geocaching Australia you can set a radius and alternative email address to be notified. |
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| + | Currently only published and retracted log types are available. This may be extended over time to include other log types like temporarily disabled or reactivated. | ||
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| + | For the purposes of GCA Cache Alerts, a moveable cache that has moved within your designated radius and has a new set of co-ordinates will be assumed to be a type of published log and you will be alerted. | ||
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| + | [[Image:Radius_boundingbox.png|left|250px]]*Radius is not actually a true radius. | ||
| + | The individual calculation of a multi pointed co-ordinate radius for each cacher based on their home co-ordinates at the time of a log occurring is very taxing on the webserver. | ||
| + | For performance reasons we establish a bounding box based on your radius distance. i.e. Rather than being a circle of (say) 50km from your home co-ordinates, we establish a co-ordinate point 50km north and south and 50km east and west. This creates a box around your home location aka a bounding box. | ||
| + | Any cache that falls into that bounding box, even if it is greater than 50km from your home location will cause an alert to be issued. In many cases this will mean you will receive a cache alert for a distance slightly larger than your radius. If you check the image to the left, the radius would be the inner circle area. For GCA Alerts, caches that are within the overall image from edge to edge are included. | ||
Revision as of 13:54, 16 March 2010
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This page contains information specific to Geocaching Australia. |
GCA Cache Alerts
GCA Cache Alerts will alert you to the status of selected caches within a selected radius* from your home co-ordinates. For each cache type that is available at Geocaching Australia you can set a radius and alternative email address to be notified.
Currently only published and retracted log types are available. This may be extended over time to include other log types like temporarily disabled or reactivated.
For the purposes of GCA Cache Alerts, a moveable cache that has moved within your designated radius and has a new set of co-ordinates will be assumed to be a type of published log and you will be alerted.
The individual calculation of a multi pointed co-ordinate radius for each cacher based on their home co-ordinates at the time of a log occurring is very taxing on the webserver. For performance reasons we establish a bounding box based on your radius distance. i.e. Rather than being a circle of (say) 50km from your home co-ordinates, we establish a co-ordinate point 50km north and south and 50km east and west. This creates a box around your home location aka a bounding box. Any cache that falls into that bounding box, even if it is greater than 50km from your home location will cause an alert to be issued. In many cases this will mean you will receive a cache alert for a distance slightly larger than your radius. If you check the image to the left, the radius would be the inner circle area. For GCA Alerts, caches that are within the overall image from edge to edge are included.
