open establishments in Sheffield in GIAS: 192 (secure units left out) URN name Street Locality Town Postcode Easting Northing 106973 Broomhall Nursery School 4 Broomhall Road Sheffield S10 2DN 434273.0 386604.0 106975 Grace Owen Nursery School 1-7 the Pavement Duke Street Sheffield S2 5QD 436122.0 387343.0 106987 Brightside Nursery Infant School Jenkin Road Sheffield S9 1AS 438585.0 390675.0 106988 Carter Knowle Junior School Carter Knowle Road Sheffield S7 2DY 433952.0 384093.0 Nominatim: 576 forward queries, 0 sent live, 576 from the cache, 0 s postcodes.io: 182 unique postcodes, 0 looked up live in 0 bulk request(s), 0.0 s distance from the GIAS coordinates (m; percentages of the schools that were found): found median_m p90_m within_50m within_100m within_250m over_1km method Nominatim free text 183/192 102.2 270.0 18.6 48.6 85.2 1 Nominatim structured 189/192 104.2 272.3 18.0 47.1 84.7 2 Nominatim by name 175/192 43.1 138.8 56.0 82.3 96.0 4 postcodes.io postcode 192/192 88.4 199.6 27.6 56.8 94.8 1 cross-check: Nominatim by name vs postcodes.io centroid for the same school: median 113 m apart 0- 250 m apart: 158 schools, error of the name match median 42 m, max 292 m 250- 1000 m apart: 13 schools, error of the name match median 122 m, max 326 m 1000- inf m apart: 4 schools, error of the name match median 1803 m, max 27137 m combined rule (name match if within 250 m of the postcode centroid, else postcode centroid): 158 from Nominatim by name, 34 from postcodes.io found 192/192 median_m 46.157467 p90_m 171.030545 within_50m 53.125 within_100m 78.125 within_250m 94.270833 over_1km 1 Nominatim free-text matches by addresstype (what the result actually is): size median p90 addresstype residential 98 105.0 269.0 tertiary 38 126.0 351.0 unclassified 14 85.0 183.0 secondary 10 90.0 205.0 amenity 10 25.0 371.0 primary 9 94.0 512.0 trunk 4 96.0 218.0 largest errors: 27.1 km Nominatim by name Kingfisher Academy | Sevenairs Road, Beighton, Sheffield, S20 1NZ -> Kingfisher Primary Academy, Coventry Grove, Wheatley, Arksey, Doncaster, South Yorkshire, England, DN2 4PY, Un 3.0 km Nominatim structured Phoenix School of Therapeutic Education | 83 East Bank Road, Sheffield, S2 3PX -> Cygnet, 83, East Bank Road, Upper Heeley, Sheaf Valley Quarter, Norfolk Park, Sheffield, South Yorkshire, Engl 3.0 km Nominatim free text Phoenix School of Therapeutic Education | 83 East Bank Road, Sheffield, S2 3PX -> Cygnet, 83, East Bank Road, Upper Heeley, Sheaf Valley Quarter, Norfolk Park, Sheffield, South Yorkshire, Engl 2.0 km Nominatim by name Sheffield Hallam University | City Campus, Pond Street, Sheffield, S1 1WB -> Sheffield Hallam University Collegiate Campus, Denham Road, Broomfield, Devonshire Quarter, Sharrow, Sheffield 1.7 km Nominatim by name King Edward VII School | Glossop Road, Sheffield, S10 2PW -> King Edward VII School - Lower Site, Darwin Lane, Stannington, Ranmoor, Sheffield, South Yorkshire, England, S 1.5 km Nominatim by name University of Sheffield | Western Bank, Sheffield, S10 2TN -> University of Sheffield, Western Bank, Saint George's Quarter, Netherthorpe, Sheffield, South Yorkshire, Engla 1.0 km Nominatim structured The Sheffield College | Granville Road, Sheffield, S2 2RL -> Sheffield, South Yorkshire, England, United Kingdom 0.8 km Nominatim structured Kenwood Academy | 9 Moncrieffe Road, Nether Edge, Sheffield, S7 1HQ -> Moncrieffe Road, Kenwood, Nether Edge, Sheffield, South Yorkshire, England, S7 1HQ, United Kingdom GIAS coordinates within 5 m of their own postcode centroid: 20 of 192 postcode centroids more than 500 m from the GIAS coordinate: 527 m Paces School for Conductive Education | Thorncliffe Hall, Newton Chambers Road, Chapeltown, Sheffield, S35 2PH (Nominatim methods: [nan, 786.0, 198.0] m) 3032 m Phoenix School of Therapeutic Education | 83 East Bank Road, Sheffield, S2 3PX (Nominatim methods: [3006.0, 3006.0, nan] m) 836 m Kenwood Academy | 9 Moncrieffe Road, Nether Edge, Sheffield, S7 1HQ (Nominatim methods: [825.0, 825.0, nan] m) no result at all: {'Nominatim by name': 17, 'Nominatim free text': 9, 'Nominatim structured': 3} reverse geocoding 40 GIAS school coordinates: Nominatim (zoom=18): returned a school feature for 28, the same full postcode as GIAS for 35, the same postcode district for 40, no postcode at all for 0 postcodes.io (nearest postcode centroid): same full postcode as GIAS for 28; nearest centroid median 55 m away nom_class amenity=school 24 emergency=defibrillator 3 amenity=grit_bin 2 building=school 2 amenity=college 2 building=semidetached_house 1 highway=residential 1 amenity=restaurant 1 name Postcode nom_class nom_name nom_postcode pio_postcode Birkdale School S10 3DH amenity=grit_bin S10 3DH S10 3DH All Saints' Catholic High School S2 2RJ amenity=school All Saints' Catholic High School S2 2RJ S2 2RJ Brook House Junior S20 1EG amenity=school Brook House Junior S20 1EG S20 1DD Westways Primary School S10 1NE building=semidetached_house S10 1NE S10 1NE Ecclesall Primary School S11 7LG amenity=school Ecclesall Primary School S11 7LG S11 7LG Nether Green Junior School S10 3QA emergency=defibrillator S10 3QA S10 3QA Lower Meadow Primary School S8 8EE highway=residential Batemoor Road S8 8BX S8 8EE Lift Firth Park S5 0SD amenity=school Lift Firth Park S5 0SD S5 0RS High Hazels Nursery Infant Academy S9 4RP amenity=school High Hazels Junior School S9 4RP S9 4RP Mundella Primary School S8 8SJ amenity=school Mundella Primary School S8 8SJ S8 8SJ figures written to C:\Users\Sean.Blaney\source\tgis-b7-5\tutorial-code\geocoding-python\output; total run time 2 s