X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/afe679349fb7139f5cff5830f45e4b8214732812..e4c40cbd36567d050f1b779f1444c4ef26c50a5b:/db/functions/functions.sql?ds=sidebyside diff --git a/db/functions/functions.sql b/db/functions/functions.sql index 5ed00ea63..97e44f0ce 100644 --- a/db/functions/functions.sql +++ b/db/functions/functions.sql @@ -40,31 +40,3 @@ BEGIN RETURN (x << 1) | y; END; $$ LANGUAGE plpgsql IMMUTABLE; - - --- maptile_for_point returns an integer representing the tile at the given zoom --- which contains the point (scaled_lon, scaled_lat). Note that the arguments --- are in the order (lat, lon), and should be scaled by 10^7. --- --- The maptile_for_point function is used only for grouping the results of the --- (deprecated?) /changes API call. Please don't use it for anything else, as --- it might go away in the future. -CREATE OR REPLACE FUNCTION maptile_for_point(scaled_lat int8, scaled_lon int8, zoom int4) - RETURNS int4 - AS $$ -DECLARE - lat CONSTANT DOUBLE PRECISION := scaled_lat / 10000000.0; - lon CONSTANT DOUBLE PRECISION := scaled_lon / 10000000.0; - zscale CONSTANT DOUBLE PRECISION := 2.0 ^ zoom; - pi CONSTANT DOUBLE PRECISION := 3.141592653589793; - r_per_d CONSTANT DOUBLE PRECISION := pi / 180.0; - x int4; - y int4; -BEGIN - -- straight port of the C code. see db/functions/maptile.c - x := floor((lon + 180.0) * zscale / 360.0); - y := floor((1.0 - ln(tan(lat * r_per_d) + 1.0 / cos(lat * r_per_d)) / pi) * zscale / 2.0); - - RETURN (x << zoom) | y; -END; -$$ LANGUAGE plpgsql IMMUTABLE;