heuristic to find wrong coordinates and / or wrong iso-codes

This query is marked as a draft This query has been published by Herzi Pinki.

Find coordinates by iso-code that are far away from the average center of all coordinates with the same iso-code and sort them by descending distance from that center. This is a heuristic to find wrong coordinates and / or wrong iso-codes. If you get to the first point already inside the iso-code area, it is unlikely to find more errors further down below. Works best for iso areas that are close to cycle shape (Switzerland, as opposed to the USA), and it does not work for areas located on both sides of the 180° meridian (e.g. FJ, NZ).
Fix & rerun. You can change iso codes through variables iso1 and iso2 (you have to copy the script).
Original script by Thomas Ledl.

SQL

use dewiki_p; set @ns:=0;
#use commonswiki_p;set @ns:=6;
set @iso1:='TH';
/*
  'XA', 'XI', 'XN', 'XO', 'XP', 'XS', 
  'AE','AF','AX','AL','AS','AD','AO','AI','AQ','AG','AR','AM','AW','AU','AT','AZ',
  'BS','BH','BD','BB','BL','BY','BE','BZ','BJ','BM','BT','BO','BQ','BA','BW','BV','BR','BN','BG','BF','BI',
  'CM','CA','CH','CV','CF','CL','CN','CX','CC','CO','CG','CD','CK','CR','CI','CU','CW','CY','CZ',
  'DE','DK','DJ','DM','DO','DZ',
  'EC','EG','EH','ER','EE','ES','ET',
  'FK','FO','FJ','FI','FR','FX',
  'GA','GB','GM','GE','GF','GH','GI','GR','GL','GD','GP','GU','GS','GT','GG','GN','GQ','GW','GY',
  'HT','HM','HN','HK','HR','HU',
  'IS','IN','IO','ID','IR','IQ','IE','IM','IL','IT',
  'JM','JP','JE','JO','KZ','KE','KH','KI','KM','KN','KP','KR','KW','KG','KY',
  'LA','LB','LC','LV','LK','LS','LR','LY','LI','LT','LU',
  'MO','MK','MF','MG','MW','MY','MV','ML','MT','MH','MQ','MR','MU','MX','FM','MD','MC','MN','ME','MS','MA','MZ','MM',
  'NA','NR','NP','NL','NC','NZ','NI','NE','NG','NU','NF','MP','NO','OM',
  'PK','PW','PS','PA','PF','PG','PY','PE','PH','PM','PN','PL','PT','PR','QA',
  'RE','RO','RU','RW','RS',
  'SM','ST','SA','SH','SN','SC','SL','SG','SX','SK','SI','SB','SO','SS','SD','SR','SJ','SZ','SE','SV','SY',
  'TD','TF','TW','TJ','TZ','TH','TL','TG','TK','TO','TT','TN','TR','TM','TC','TV',
  'UG','UA','US','UM','UY','UZ',
  'VA','VC','VU','VE','VN','VG','VI',
  'WF','WS','YE','YT','ZA','ZM','ZW'
*/
#set @iso2:='' or code
set @iso2:='';

select distinct sqrt((gt_lat - cen_gt_lat)*(gt_lat - cen_gt_lat) + (gt_lon - cen_gt_lon)*(gt_lon - cen_gt_lon)) as distanz_ungefaehr, 
       gt_lat, gt_lon, gt_page_id, gt_name,
       p1.page_namespace as ns,
       p1.page_title as title,
       gt_country,gt_region FROM geo_tags AS g1 JOIN page AS p1 ON g1.gt_page_id = p1.page_id,
       (select avg(gt_lat) cen_gt_lat,avg(gt_lon) cen_gt_lon,count(*) from geo_tags
        where 
        	case 
        		when @iso2=''
        		then gt_country=@iso1
        		else gt_country=@iso1 and gt_region=@iso2
        		end) as zentrumdavon
        where
        	case
            	when @iso2=''
                then gt_country=@iso1 
                else gt_country=@iso1 and gt_region=@iso2
                end
       having ns= @ns
       order by 1 desc limit 500;
       
select distinct sqrt((gt_lat - cen_gt_lat)*(gt_lat - cen_gt_lat) + (gt_lon - cen_gt_lon)*(gt_lon - cen_gt_lon)) as distanz_ungefaehr, 
       gt_lat, gt_lon, gt_page_id, gt_name,
       p1.page_namespace as ns,
       p1.page_title as title,
       gt_country,gt_region FROM geo_tags AS g1 JOIN page AS p1 ON g1.gt_page_id = p1.page_id,
       (select avg(gt_lat) cen_gt_lat,avg(gt_lon) cen_gt_lon,count(*) from geo_tags
        where gt_country=@iso1 and gt_region is null
        		) as zentrumdavon
        where gt_country=@iso1 and gt_region is null
       having ns= @ns
       order by 1 desc limit 500;
#and gt_region is null

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