Files
observatory-extension/src/pg/sql/45_observatory_mvt.sql
2018-05-30 09:11:27 +02:00

418 lines
19 KiB
PL/PgSQL

CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetTileBounds(z INTEGER, x INTEGER, y INTEGER)
RETURNS NUMERIC[] AS $$
import math
def tile2lnglat(z, x, y):
n = 2.0 ** z
y = (1 << z) - y - 1
lon = x / n * 360.0 - 180.0
lat_rad = math.atan(math.sinh(math.pi * (1 - 2 * y / n)))
lat = - math.degrees(lat_rad)
return lon, lat
lon0, lat0 = tile2lnglat(z, x, y)
lon1, lat1 = tile2lnglat(z, x+1, y-1)
return [lon0, lat0, lon1, lat1]
$$ LANGUAGE plpythonu;
DROP FUNCTION IF EXISTS cdb_observatory.OBS_GetMVT(z INTEGER, x INTEGER, y INTEGER, params JSONB);
CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetMVT(z INTEGER, x INTEGER, y INTEGER,
params JSON DEFAULT NULL,
extent INTEGER DEFAULT 4096, buf INTEGER DEFAULT 256, clip_geom BOOLEAN DEFAULT True)
RETURNS TABLE (mvt BYTEA)
AS $$
DECLARE
bounds NUMERIC[];
geom GEOMETRY;
ext BOX2D;
meta JSON;
procgeom_clauses TEXT;
val_clauses TEXT;
json_clause TEXT;
BEGIN
bounds := cdb_observatory.OBS_GetTileBounds(z, x, y);
geom := ST_MakeEnvelope(bounds[1], bounds[2], bounds[3], bounds[4], 4326);
ext := ST_MakeBox2D(ST_Point(bounds[1], bounds[2]), ST_Point(bounds[3], bounds[4]));
meta := cdb_observatory.obs_getmeta(geom, params::json, 1::integer, 1::integer, 1::integer);
/* Read metadata to generate clauses for query */
EXECUTE $query$
WITH _meta AS (SELECT
row_number() over () colid, *
FROM json_to_recordset($1)
AS x(id TEXT, numer_id TEXT, numer_aggregate TEXT, numer_colname TEXT,
numer_geomref_colname TEXT, numer_tablename TEXT, numer_type TEXT,
denom_id TEXT, denom_aggregate TEXT, denom_colname TEXT,
denom_geomref_colname TEXT, denom_tablename TEXT, denom_type TEXT,
denom_reltype TEXT, geom_id TEXT, geom_colname TEXT,
geom_geomref_colname TEXT, geom_tablename TEXT, geom_type TEXT,
numer_timespan TEXT, geom_timespan TEXT, normalization TEXT,
api_method TEXT, api_args JSON)
),
-- Generate procgeom clauses.
-- These join the users' geoms to the relevant geometries for the
-- asked-for measures in the Observatory.
_procgeom_clauses AS (
SELECT
'_procgeoms_' || Coalesce(left(geom_tablename,40) || '_' || geom_geomref_colname, api_method) || ' AS (' ||
'SELECT ' ||
'st_intersection(' || geom_tablename || '.' || geom_colname || ', _geoms.geom) AS geom, ' ||
'ST_AsMVTGeom(st_intersection(' || geom_tablename || '.' || geom_colname || ', _geoms.geom), $2, $3, $4, $5) AS mvtgeom, ' ||
geom_tablename || '.' || geom_geomref_colname || ' AS geomref, ' ||
'CASE WHEN ST_Within(_geoms.geom, ' || geom_tablename || '.' || geom_colname || ')
THEN ST_Area(_geoms.geom) / Nullif(ST_Area(' || geom_tablename || '.' || geom_colname || '), 0)
WHEN ST_Within(' || geom_tablename || '.' || geom_colname || ', _geoms.geom)
THEN 1
ELSE ST_Area(cdb_observatory.safe_intersection(_geoms.geom, ' || geom_tablename || '.' || geom_colname || ')) /
Nullif(ST_Area(' || geom_tablename || '.' || geom_colname || '), 0)
END pct_obs' || '
FROM _geoms, observatory.' || geom_tablename || '
WHERE ST_Intersects(_geoms.geom, ' || geom_tablename || '.' || geom_colname || ')'
|| ')'
AS procgeom_clause
FROM _meta
GROUP BY api_method, geom_tablename, geom_geomref_colname, geom_colname
),
-- Generate val clauses.
-- These perform interpolations or other necessary calculations to
-- provide values according to users geometries.
_val_clauses AS (
SELECT
'_vals_' || Coalesce(left(geom_tablename,40) || '_' || geom_geomref_colname, api_method) || ' AS (
SELECT _procgeoms.geomref, _procgeoms.mvtgeom, ' ||
String_Agg('json_build_object(' || CASE
-- api-delivered values
WHEN api_method IS NOT NULL THEN
'''' || numer_colname || ''', ' ||
'ARRAY_AGG( ' ||
api_method || '.' || numer_colname || ')::' || numer_type || '[]'
-- numeric internal values
WHEN cdb_observatory.isnumeric(numer_type) THEN
'''' || numer_colname || ''', ' || CASE
-- denominated
WHEN LOWER(normalization) LIKE 'denom%'
THEN CASE
WHEN denom_tablename IS NULL THEN ' NULL '
-- denominated polygon interpolation
ELSE
' ROUND(CAST(SUM(' || numer_tablename || '.' || numer_colname || ' ' ||
' * _procgeoms.pct_obs ' ||
' ) / NULLIF(SUM(' || denom_tablename || '.' || denom_colname || ' ' ||
' * _procgeoms.pct_obs), 0) AS NUMERIC), 4) '
END
-- areaNormalized
WHEN LOWER(normalization) LIKE 'area%'
THEN
-- areaNormalized polygon interpolation
' ROUND(CAST(SUM(' || numer_tablename || '.' || numer_colname || ' ' ||
' * _procgeoms.pct_obs' ||
' ) / (Nullif(ST_Area(cdb_observatory.FIRST(_procgeoms.geom)::Geography), 0) / 1000000) AS NUMERIC), 4) '
-- median/average measures with universe
WHEN LOWER(numer_aggregate) IN ('median', 'average') AND
denom_reltype ILIKE 'universe' AND LOWER(normalization) LIKE 'pre%'
THEN
-- predenominated polygon interpolation weighted by universe
' ROUND(CAST(SUM(' || numer_tablename || '.' || numer_colname ||
' * ' || denom_tablename || '.' || denom_colname ||
' * _procgeoms.pct_obs ' ||
' ) / Nullif(SUM(' || denom_tablename || '.' || denom_colname ||
' * _procgeoms.pct_obs ' || '), 0)AS NUMERIC), 4) '
-- prenormalized for summable measures. point or summable only!
WHEN numer_aggregate ILIKE 'sum' AND LOWER(normalization) LIKE 'pre%'
THEN
-- predenominated polygon interpolation
' ROUND(CAST(SUM(' || numer_tablename || '.' || numer_colname || ' ' ||
' * _procgeoms.pct_obs) AS NUMERIC), 4) '
-- Everything else. Point only!
ELSE
' cdb_observatory._OBS_RaiseNotice(''Cannot perform calculation over polygon for ' ||
numer_id || '/' || coalesce(denom_id, '') || '/' || geom_id || '/' || numer_timespan || ''')::Numeric '
END || '::' || numer_type
-- categorical/text
WHEN LOWER(numer_type) LIKE 'text' THEN
'''' || numer_colname || ''', ' || 'MODE() WITHIN GROUP (ORDER BY ' || numer_tablename || '.' || numer_colname || ') '
-- geometry
WHEN numer_id IS NULL THEN
'''geomref'', _procgeoms.geomref, ' ||
'''' || numer_colname || ''', ' || 'cdb_observatory.FIRST(_procgeoms.mvtgeom)::TEXT'
ELSE ''
END
|| ') val_' || colid, ', ')
|| '
FROM _procgeoms_' || Coalesce(left(geom_tablename,40) || '_' || geom_geomref_colname, api_method) || ' _procgeoms ' ||
Coalesce(String_Agg(DISTINCT
Coalesce('LEFT JOIN observatory.' || numer_tablename || ' ON _procgeoms.geomref = observatory.' || numer_tablename || '.' || numer_geomref_colname,
', LATERAL (SELECT * FROM cdb_observatory.' || api_method || '(_procgeoms.mvtgeom' || Coalesce(', ' ||
(SELECT STRING_AGG(REPLACE(val::text, '"', ''''), ', ')
FROM (SELECT JSON_Array_Elements(api_args) as val) as vals),
'') || ')) AS ' || api_method)
, ' '), '') ||
E'\n GROUP BY _procgeoms.geomref, _procgeoms.mvtgeom
ORDER BY _procgeoms.geomref'
|| ')'
AS val_clause,
'_vals_' || Coalesce(left(geom_tablename, 40) || '_' || geom_geomref_colname, api_method) AS cte_name
FROM _meta
GROUP BY geom_tablename, geom_geomref_colname, geom_colname, api_method
),
-- Generate clauses necessary to join together val_clauses
_val_joins AS (
SELECT String_Agg(a.cte_name || '.geomref = ' || b.cte_name || '.geomref ', ' AND ') val_joins
FROM _val_clauses a, _val_clauses b
WHERE a.cte_name != b.cte_name
AND a.cte_name < b.cte_name
),
-- Generate JSON clause. This puts together vals from val_clauses
_json_clause AS (SELECT
'SELECT ST_AsMVT(q, ''data'', $3) FROM (' ||
'SELECT ' || cdb_observatory.FIRST(cte_name) || '.mvtgeom geom,
replace(' || (SELECT String_Agg('val_' || colid, '::TEXT || ') FROM _meta) || ', ''}{'', '', '')::jsonb
FROM ' || String_Agg(cte_name, ', ') ||
' WHERE ST_Area(' || cdb_observatory.FIRST(cte_name) || '.mvtgeom) > 0' ||
Coalesce(' AND ' || val_joins, ') q')
AS json_clause
FROM _val_clauses, _val_joins
GROUP BY val_joins
)
SELECT (SELECT String_Agg(procgeom_clause, E',\n ') FROM _procgeom_clauses),
(SELECT String_Agg(val_clause, E',\n ') FROM _val_clauses),
json_clause
FROM _json_clause
$query$ INTO
procgeom_clauses,
val_clauses,
json_clause
USING meta;
IF procgeom_clauses IS NULL OR val_clauses IS NULL OR json_clause IS NULL THEN
RETURN;
END IF;
/* Execute query */
RETURN QUERY EXECUTE format($query$
WITH _geoms AS (%s),
-- procgeom_clauses
%s,
-- val_clauses
%s
-- json_clause
%s
$query$, 'SELECT $1::geometry as geom',
String_Agg(procgeom_clauses, E',\n '),
String_Agg(val_clauses, E',\n '),
json_clause)
USING geom, ext, extent, buf, clip_geom;
RETURN;
END
$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetMCDOMVT(z INTEGER, x INTEGER, y INTEGER,
geography_level TEXT,
do_measurements TEXT[],
mastercard_measurements TEXT[],
shoreline_clipped BOOLEAN DEFAULT True,
optimize_clipping BOOLEAN DEFAULT False,
simplify_geometries BOOLEAN DEFAULT False,
area_normalized BOOLEAN DEFAULT False,
mastercard_category TEXT DEFAULT 'Total Retail',
extent INTEGER DEFAULT 4096, buf INTEGER DEFAULT 256, clip_geom BOOLEAN DEFAULT True)
RETURNS TABLE (
mvtgeom GEOMETRY,
mvtdata JSON
)
AS $$
DECLARE
state_geoname CONSTANT TEXT DEFAULT 'us.census.tiger.state';
county_geoname CONSTANT TEXT DEFAULT 'us.census.tiger.county';
tract_geoname CONSTANT TEXT DEFAULT 'us.census.tiger.census_tract';
blockgroup_geoname CONSTANT TEXT DEFAULT 'us.census.tiger.block_group';
block_geoname CONSTANT TEXT DEFAULT 'us.census.tiger.block';
mastercard_schema CONSTANT TEXT DEFAULT 'us.mastercard';
mastercard_geoid CONSTANT TEXT DEFAULT 'region_id';
mastercard_category_column CONSTANT TEXT DEFAULT 'category';
mastercard_table TEXT;
bounds NUMERIC[];
geom GEOMETRY;
ext BOX2D;
measurement TEXT;
getmeta_parameters TEXT;
meta JSON;
numer_tablename_do TEXT DEFAULT '';
numer_tablenames_do TEXT[] DEFAULT ARRAY['']::TEXT[];
numer_tablenames_do_outer TEXT DEFAULT '';
numer_tablenames_mc TEXT;
numer_colnames_do TEXT DEFAULT '';
numer_colnames_do_qualified TEXT DEFAULT '';
numer_colnames_do_normalized TEXT DEFAULT '';
numer_colnames_mc TEXT;
numer_colnames_mc_normalized TEXT;
geom_tablenames TEXT;
geom_colnames TEXT;
geom_geomref_colnames TEXT;
geom_geomref_colnames_qualified TEXT;
geom_relations_do TEXT[] DEFAULT ARRAY['']::TEXT[];
geom_relations_mc TEXT;
simplification_tolerance NUMERIC DEFAULT 0;
area_normalization TEXT DEFAULT '';
i INTEGER DEFAULT 0;
clipped TEXT default '';
BEGIN
IF area_normalized THEN
area_normalization := '/area_ratio';
END IF;
IF shoreline_clipped THEN
clipped := '_clipped';
END IF;
CASE
WHEN geography_level = state_geoname THEN
simplification_tolerance := 0.1;
IF optimize_clipping THEN
clipped := '';
END IF;
WHEN geography_level = county_geoname THEN
simplification_tolerance := 0.01;
WHEN geography_level = tract_geoname THEN
simplification_tolerance := 0.001;
WHEN geography_level = blockgroup_geoname THEN
simplification_tolerance := 0.0001;
WHEN geography_level = block_geoname THEN
simplification_tolerance := 0.0001;
ELSE
RETURN;
END CASE;
IF NOT simplify_geometries THEN
simplification_tolerance := 0;
END IF;
bounds := cdb_observatory.OBS_GetTileBounds(z, x, y);
geom := ST_MakeEnvelope(bounds[1], bounds[2], bounds[3], bounds[4], 4326);
ext := ST_MakeBox2D(ST_Point(bounds[1], bounds[2]), ST_Point(bounds[3], bounds[4]));
---------DO---------
getmeta_parameters := '[ ';
FOREACH measurement IN ARRAY do_measurements LOOP
getmeta_parameters := getmeta_parameters || '{"numer_id":"' || measurement || '","geom_id":"' || geography_level || clipped ||'"},';
END LOOP;
getmeta_parameters := substring(getmeta_parameters from 1 for length(getmeta_parameters) - 1) || ' ]';
meta := cdb_observatory.obs_getmeta(geom, getmeta_parameters::json, 1::integer, 1::integer, 1::integer);
IF meta IS NOT NULL THEN
SELECT array_agg(distinct 'observatory.'||numer_tablename) numer_tablenames,
string_agg(distinct numer_colname, ',')||',' numer_colnames,
string_agg(distinct numer_tablename||'.'||numer_colname, ',')||',' numer_colnames_qualified,
string_agg(distinct numer_colname||area_normalization||' '||numer_colname, ',')||',' numer_colnames_normalized,
(array_agg(distinct 'observatory.'||geom_tablename))[1] geom_tablenames,
(array_agg(distinct geom_colname))[1] geom_colnames,
(array_agg(distinct geom_geomref_colname))[1] geom_geomref_colnames,
(array_agg(distinct geom_tablename||'.'||geom_geomref_colname))[1] geom_geomref_colnames_qualified,
array_agg(distinct numer_tablename||'.'||numer_geomref_colname||'='||geom_tablename||'.'||geom_geomref_colname) geom_relations
INTO numer_tablenames_do, numer_colnames_do, numer_colnames_do_qualified, numer_colnames_do_normalized, geom_tablenames, geom_colnames,
geom_geomref_colnames, geom_geomref_colnames_qualified, geom_relations_do
FROM json_to_recordset(meta)
AS x(id TEXT, numer_id TEXT, numer_aggregate TEXT, numer_colname TEXT, numer_geomref_colname TEXT, numer_tablename TEXT,
numer_type TEXT, denom_id TEXT, denom_aggregate TEXT, denom_colname TEXT, denom_geomref_colname TEXT, denom_tablename TEXT,
denom_type TEXT, denom_reltype TEXT, geom_id TEXT, geom_colname TEXT, geom_geomref_colname TEXT, geom_tablename TEXT,
geom_type TEXT, numer_timespan TEXT, geom_timespan TEXT, normalization TEXT, api_method TEXT, api_args JSON);
IF numer_tablenames_do IS NULL OR numer_colnames_do IS NULL OR numer_colnames_do_qualified IS NULL OR numer_colnames_do_normalized IS NULL
OR geom_tablenames IS NULL OR geom_colnames IS NULL OR geom_geomref_colnames IS NULL OR geom_geomref_colnames_qualified IS NULL
OR geom_relations_do IS NULL THEN
RETURN;
END IF;
i := 0;
FOREACH numer_tablename_do IN ARRAY numer_tablenames_do LOOP
i := i + 1;
numer_tablenames_do_outer := numer_tablenames_do_outer || 'LEFT OUTER JOIN ' || numer_tablename_do || ' ON ' || geom_relations_do[i] || ' ';
END LOOP;
ELSE
getmeta_parameters := '[{"geom_id":"' || geography_level || clipped ||'"}]';
meta := cdb_observatory.obs_getmeta(geom, getmeta_parameters::json, 1::integer, 1::integer, 1::integer);
IF meta IS NULL THEN
RETURN;
END IF;
SELECT (array_agg(distinct 'observatory.'||geom_tablename))[1] geom_tablenames,
(array_agg(distinct geom_colname))[1] geom_colnames,
(array_agg(distinct geom_geomref_colname))[1] geom_geomref_colnames,
(array_agg(distinct geom_tablename||'.'||geom_geomref_colname))[1] geom_geomref_colnames_qualified
FROM json_to_recordset(meta)
INTO geom_tablenames, geom_colnames, geom_geomref_colnames, geom_geomref_colnames_qualified
AS x(id TEXT, numer_id TEXT, numer_aggregate TEXT, numer_colname TEXT, numer_geomref_colname TEXT, numer_tablename TEXT,
numer_type TEXT, denom_id TEXT, denom_aggregate TEXT, denom_colname TEXT, denom_geomref_colname TEXT, denom_tablename TEXT,
denom_type TEXT, denom_reltype TEXT, geom_id TEXT, geom_colname TEXT, geom_geomref_colname TEXT, geom_tablename TEXT,
geom_type TEXT, numer_timespan TEXT, geom_timespan TEXT, normalization TEXT, api_method TEXT, api_args JSON);
END IF;
---------MasterCard---------
SELECT tablename from pg_tables
INTO mastercard_table
WHERE schemaname = mastercard_schema
AND tablename LIKE '%'||(string_to_array(geography_level, '.'))[array_length(string_to_array(geography_level, '.'), 1)]||'%';
SELECT string_agg(column_name, ','), string_agg(distinct column_name||area_normalization||' '||column_name, ',')
INTO numer_colnames_mc, numer_colnames_mc_normalized
FROM information_schema.columns
WHERE table_schema = mastercard_schema
AND table_name = mastercard_table
AND column_name = ANY(mastercard_measurements);
numer_tablenames_mc := '"'||mastercard_schema||'".'||mastercard_table;
geom_relations_mc := mastercard_table||'.'||mastercard_geoid||'='||geom_geomref_colnames_qualified;
IF numer_colnames_mc IS NULL OR numer_colnames_mc_normalized IS NULL
OR numer_tablenames_mc IS NULL OR geom_relations_mc IS NULL THEN
RETURN;
END IF;
---------Query build and execution---------
RETURN QUERY EXECUTE format(
$query$
SELECT mvtgeom,
(select row_to_json(_) from (select id, %13$s %3$s, area_ratio) as _) as mvtdata
FROM (
SELECT ST_AsMVTGeom(ST_Transform(the_geom, 3857), $1, $2, $3, $4) AS mvtgeom, %12$s as id, %10$s %11$s, area_ratio FROM (
SELECT %1$s the_geom, %12$s, %2$s %3$s,
CASE WHEN ST_Within($5, %1$s)
THEN ST_Area($5) / Nullif(ST_Area(%1$s), 0)
WHEN ST_Within(%1$s, $5)
THEN 1
ELSE ST_Area(cdb_observatory.safe_intersection(st_simplifyvw(%1$s, $7), $5)) / Nullif(ST_Area(%1$s), 0)
END area_ratio
FROM %6$s
%4$s
LEFT OUTER JOIN %5$s ON %7$s AND %8$s.%9$s=$6
WHERE st_intersects(%1$s, $5)
) p
) q
$query$,
geom_colnames, numer_colnames_do_qualified, numer_colnames_mc, numer_tablenames_do_outer, numer_tablenames_mc,
geom_tablenames, geom_relations_mc, mastercard_table, mastercard_category_column, numer_colnames_do_normalized,
numer_colnames_mc_normalized, geom_geomref_colnames, numer_colnames_do)
USING ext, extent, buf, clip_geom, geom, mastercard_category, simplification_tolerance
RETURN;
END
$$ LANGUAGE plpgsql PARALLEL RESTRICTED;