[Loadstone] Google Maps batch mode
shawn at odyssey.cm.nu
Tue Sep 18 07:18:56 BST 2007
Just a slight correction to Rob's message about creating your own points.
The value for the satellites field doesn't matter since it's not currently
used. The value for accuracy should be whatever the point accuracy is in
metres. If unknown, just use 1. The userid should be the crc16 of your
username. This can be as high as 65535 but no higher. The userid is usually
5 digits but can be less depending on the calculated value.
On Tue, 18 Sep 2007, Rob Melchers wrote:
> I have to correct myself. You may submit 5000 queries per day with Googles
> lookup method, but I realized that my largest query ever has been less than
> 500 queries and that took about 25 seconds (well within the PHP execution
> time). On average I'd say that with the method I use to query Google in
> batch mode I get about 10 points per second. Sorry for that, a bit
> overoptimistic. However, these results checked as rather reliable, while
> the data from e.g. geonames.org proved to be fun but useless. If unique
> city names appear four times in the same database with distances as much as
> 45 KM between them I don't think that's ready for release yet. Also
> about 25% of the points had a proximity of less than 10 meters to their
> closest point which makes the reliability of announcements in Loadstone
> lower, if not unusable.
> On another topic: if you are generating databases for Loadstone please use
> 2,4,2 for the accuracy, satellites and priority fields, a userid of 5
> digits (preferably your own userid) and a id that is your local time
> (time()) minus 315360000 (10 years of seconds). This creates a private
> point with a timestamp that is in the range that Loadstone knows as a
> generated point and cannot cause any copyright issues.
> Loadstone mailing list
> Loadstone at loadstone-gps.com
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