Tudor
d3e655abdb
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Convert GIAS British National Grid coordinates (EPSG:27700) to WGS84 (EPSG:4326) directly in the dbt model. The geocode script backfills schools missing easting/northing via Postcodes.io. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
26 lines
775 B
SQL
26 lines
775 B
SQL
-- Mart: School location dimension — one row per URN, PostGIS-enabled
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-- Geometry derived from GIAS easting/northing (British National Grid → WGS84).
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-- For schools missing easting/northing, the geocode script backfills via Postcodes.io.
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select
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s.urn,
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s.address_line1,
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s.address_line2,
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s.town,
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s.county,
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s.postcode,
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s.local_authority_code,
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s.local_authority_name,
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s.parliamentary_constituency,
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s.urban_rural,
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s.easting,
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s.northing,
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case
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when s.easting is not null and s.northing is not null
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then ST_Transform(ST_SetSRID(ST_MakePoint(s.easting, s.northing), 27700), 4326)
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else null
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end as geom
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from {{ ref('stg_gias_establishments') }} s
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where s.status = 'Open'
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and s.postcode is not null
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