20e9299226
-link to https://github.com/colouring-london/colouring_london_analysis/blob/master/bulk_extracts/nlud_landuse_classification.sql
31 lines
1.5 KiB
SQL
31 lines
1.5 KiB
SQL
--Landuse is hierachical. Highest level is Order (Residential) then Group (Residential-Dwelling) then Class (Residential-Dwelling-Detached house)
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--Interface will collected most detailed (class) but visualise highest level (order)
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--Landuse is a table as #358
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-- Land use is table with 3 levels of hierachy (highest to lowest). order > group > class
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-- Land use class or classes, array object, client constrained. ARRAY[] is used to constrain array size. The array is limited to 250 based on Westfield Stratford as a single toid with many uses, this may want to be reduced down to reduce maximum size.
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ALTER TABLE buildings ADD COLUMN IF NOT EXISTS current_landuse_class text ARRAY[250];
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-- Land use order, singular. Client and db constrained with foreign key
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--
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ALTER TABLE buildings ADD COLUMN IF NOT EXISTS current_landuse_order text,
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ADD CONSTRAINT fk_landuse_order
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FOREIGN KEY ("level")
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REFERENCES bulk_sources.nlud_classification_order_group ("level");
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--===========================================
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--
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-- We also collect original landuse, structure & process is as current land use
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-- We don't currently collect intermediate historic uses
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--
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--===========================================
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-- Original Land use class or classes, array object, client constrained.
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ALTER TABLE buildings ADD COLUMN IF NOT EXISTS original_landuse_class text ARRAY[250];
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-- Land use order, singular. Client and db constrained.
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ALTER TABLE buildings ADD COLUMN IF NOT EXISTS original_landuse_order;
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