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Change the gps_points table to store latitude and longitude values to

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seven decimal places to given a worse case precision of about 1cm.
This commit is contained in:
Tom Hughes 2007-09-18 23:29:47 +00:00
parent 62dfa5ff45
commit 9afb35449b
5 changed files with 14 additions and 14 deletions
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2
db/functions/quadtile.c
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@ -27,5 +27,5 @@ long long tile_for_point(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *
long long lat = *(long long *)args->args[0];
long long lon = *(long long *)args->args[1];
return xy2tile(lon2x(lon / 1000000.0), lat2y(lat / 1000000.0));
return xy2tile(lon2x(lon / 10000000.0), lat2y(lat / 10000000.0));
}

2
db/migrate/005_tile_tracepoints.rb
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@ -4,7 +4,7 @@ class TileTracepoints < ActiveRecord::Migration
add_index "gps_points", ["tile"], :name => "points_tile_idx"
remove_index "gps_points", :name => "points_idx"
Tracepoint.update_all("tile = tile_for_point(latitude, longitude)")
Tracepoint.update_all("latitude = latitude * 10, longitude = longitude * 10, tile = tile_for_point(latitude * 10, longitude * 10)")
end
def self.down