Chapter 15 revisions
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@ -110,17 +110,17 @@ ALTER TABLE farmers_markets ADD COLUMN geog_point geography(POINT,4326);
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-- Now fill that column with the lat/long
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UPDATE farmers_markets
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SET geog_point = ST_SetSRID(
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ST_MakePoint(longitude,latitude),4326
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)::geography;
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ST_MakePoint(longitude,latitude)::geography,4326
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);
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-- Add a GiST index
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-- Add a spatial (R-Tree) index using GIST
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CREATE INDEX market_pts_idx ON farmers_markets USING GIST (geog_point);
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-- View the geography column
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SELECT longitude,
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latitude,
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geog_point,
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ST_AsText(geog_point)
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ST_AsEWKT(geog_point)
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FROM farmers_markets
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WHERE longitude IS NOT NULL
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LIMIT 5;
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@ -153,7 +153,7 @@ SELECT market_name,
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round(
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(ST_Distance(geog_point,
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ST_GeogFromText('POINT(-93.6204386 41.5853202)')
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) / 1609.344)::numeric(8,5), 2
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) / 1609.344)::numeric, 2
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) AS miles_from_dt
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FROM farmers_markets
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WHERE ST_DWithin(geog_point,
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@ -161,6 +161,19 @@ WHERE ST_DWithin(geog_point,
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10000)
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ORDER BY miles_from_dt ASC;
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-- Listing 15-13: Using the <-> distance operator for a nearest neighbors search
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SELECT market_name,
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city,
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st,
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round(
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(ST_Distance(geog_point,
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ST_GeogFromText('POINT(-68.2041607 44.3876414)')
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) / 1609.344)::numeric, 2
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) AS miles_from_bh
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FROM farmers_markets
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ORDER BY geog_point <-> ST_GeogFromText('POINT(-68.2041607 44.3876414)')
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LIMIT 3;
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-- WORKING WITH SHAPEFILES
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@ -174,14 +187,14 @@ ORDER BY miles_from_dt ASC;
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-- Import (for use on command line if on macOS or Linux; see Chapter 18)
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shp2pgsql -I -s 4269 -W LATIN1 tl_2019_us_county.shp us_counties_2019_shp | psql -d analysis -U postgres
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-- Listing 15-13: Checking the geom column's well-known text representation
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-- Listing 15-14: Checking the geom column's well-known text representation
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SELECT ST_AsText(geom)
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FROM us_counties_2019_shp
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ORDER BY gid
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LIMIT 1;
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-- Listing 15-14: Find the largest counties by area using ST_Area()
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-- Listing 15-15: Find the largest counties by area using ST_Area()
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SELECT name,
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statefp AS st,
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@ -192,7 +205,7 @@ FROM us_counties_2019_shp
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ORDER BY square_miles DESC
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LIMIT 5;
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-- Listing 15-15: Using ST_Within() to find the county belonging to a pair of coordinates
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-- Listing 15-16: Using ST_Within() to find the county belonging to a pair of coordinates
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SELECT sh.name,
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c.state_name
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@ -202,8 +215,7 @@ WHERE ST_Within(
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'SRID=4269;POINT(-118.3419063 34.0977076)'::geometry, geom
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);
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-- Listing 15-16: Using ST_DWithin() to count people near Lincoln, Nebraska
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-- Listing 15-17: Using ST_DWithin() to count people near Lincoln, Nebraska
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SELECT sum(c.pop_est_2019) AS pop_est_2019
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FROM us_counties_2019_shp sh JOIN us_counties_pop_est_2019 c
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ON sh.statefp = c.state_fips AND sh.countyfp = c.county_fips
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@ -211,7 +223,11 @@ WHERE ST_DWithin(sh.geom::geography,
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ST_GeogFromText('SRID=4269;POINT(-96.699656 40.811567)'),
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80467);
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-- Listing 15-17: Displaying counties near Lincoln, Nebraska
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-- Note: You can speed up the above query by creating a functional index
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-- that covers the casting of the geom column to a geography type.
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CREATE INDEX us_counties_2019_shp_geog_idx ON us_counties_2019_shp USING GIST (CAST(geom AS geography));
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-- Listing 15-18: Displaying counties near Lincoln, Nebraska
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SELECT sh.name,
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c.state_name,
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c.pop_est_2019,
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@ -250,7 +266,7 @@ WHERE ST_DWithin(sh.geom::geography,
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shp2pgsql -I -s 4269 -W LATIN1 tl_2019_35049_linearwater.shp santafe_linearwater_2019 | psql -d analysis -U postgres
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shp2pgsql -I -s 4269 -W LATIN1 tl_2019_35049_roads.shp santafe_roads_2019 | psql -d analysis -U postgres
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-- Listing 15-18: Using ST_GeometryType() to determine geometry
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-- Listing 15-19: Using ST_GeometryType() to determine geometry
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SELECT ST_GeometryType(geom)
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FROM santafe_linearwater_2019
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@ -260,7 +276,7 @@ SELECT ST_GeometryType(geom)
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FROM santafe_roads_2019
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LIMIT 1;
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-- Listing 15-19: Spatial join with ST_Intersects() to find roads crossing the Santa Fe river
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-- Listing 15-20: Spatial join with ST_Intersects() to find roads crossing the Santa Fe river
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SELECT water.fullname AS waterway,
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roads.rttyp,
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@ -280,7 +296,7 @@ WHERE water.fullname = 'Santa Fe Riv'
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AND roads.fullname IS NOT NULL
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ORDER BY roads.fullname;
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-- Listing 15-20: Using ST_Intersection() to show where roads cross the river
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-- Listing 15-21: Using ST_Intersection() to show where roads cross the river
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SELECT water.fullname AS waterway,
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roads.rttyp,
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@ -290,6 +306,5 @@ FROM santafe_linearwater_2019 water JOIN santafe_roads_2019 roads
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ON ST_Intersects(water.geom, roads.geom)
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WHERE water.fullname = 'Santa Fe Riv'
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AND roads.fullname IS NOT NULL
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ORDER BY roads.fullname
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LIMIT 5;
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ORDER BY roads.fullname;
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@ -1,17 +1,17 @@
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FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1012063, Caledonia Farmers Market Association - Danville,,Danville ,Caledonia,Vermont,05828,-72.140305,44.411013,Y
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1011871, Stearns Homestead Farmers' Market,6975 Ridge Road,Parma ,Cuyahoga,Ohio,44130,-81.7285969,41.3751180,-
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1012063,Caledonia Farmers Market Association - Danville,,Danville,Caledonia,Vermont,05828,-72.140305,44.411013,Y
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1011871,Stearns Homestead Farmers' Market,6975 Ridge Road,Parma,Cuyahoga,Ohio,44130,-81.7285969,41.3751180,-
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1009364,106 S. Main Street Farmers Market,106 S. Main Street,Six Mile,,South Carolina,29682,-82.8187,34.8042,-
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1010691,10th Steet Community Farmers Market,10th Street and Poplar,Lamar ,Barton,Missouri,64759,-94.2746191,37.4956280,-
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1010691,10th Steet Community Farmers Market,10th Street and Poplar,Lamar,Barton,Missouri,64759,-94.2746191,37.4956280,-
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1002454,112st Madison Avenue,112th Madison Avenue,New York,New York,New York,10029,-73.9493,40.7939,-
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1011100,12 South Farmers Market,3000 Granny White Pike,Nashville,Davidson,Tennessee,37204,-86.790709,36.118370,Y
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1009845,125th Street Fresh Connect Farmers' Market,"163 West 125th Street and Adam Clayton Powell, Jr. Blvd.",New York,New York,New York,10027,-73.9482477,40.8089533,Y
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1005586,12th & Brandywine Urban Farm Market,12th & Brandywine Streets,Wilmington,New Castle,Delaware,19801,-75.534460,39.742117,N
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1008071,14&U Farmers' Market,1400 U Street NW ,Washington,District of Columbia,District of Columbia,20009,-77.0320505,38.9169984,Y
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1012710,14th & Kennedy Street Farmers Market,"5500 Colorado Avenue, NW",Washington ,District of Columbia,District of Columbia,20011,-77.0334486,38.9559783,N
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1016782,175th Street Greenmarket,175th Street between Wadsworth & Broadway,New York ,New York,New York,10033,-73.938049,40.846354,N
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1008071,14&U Farmers' Market,1400 U Street NW,Washington,District of Columbia,District of Columbia,20009,-77.0320505,38.9169984,Y
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1012710,14th & Kennedy Street Farmers Market,"5500 Colorado Avenue, NW",Washington,District of Columbia,District of Columbia,20011,-77.0334486,38.9559783,N
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1016782,175th Street Greenmarket,175th Street between Wadsworth & Broadway,New York,New York,New York,10033,-73.938049,40.846354,N
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1003877,17th Ave Market,1622 6th St NE,Minneapolis,Hennepin,Minnesota,55413,-93.2591,45.0044,-
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1016784,17th Street Farmers Market,100 North 17th St.,Richmond ,Richmond City,Virginia,23219,-77.428364,37.533850,-
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1016784,17th Street Farmers Market,100 North 17th St.,Richmond,Richmond City,Virginia,23219,-77.428364,37.533850,-
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1010968,18th and Christian Farmers' Market,18th Street and Christian Street,Philadelphia,Philadelphia,Pennsylvania,19146,-75.173431,39.940943,N
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1009994,18th Street Farmer's Market,18th and Broadway,Scottsbluff,Scotts Bluff,Nebraska,69361,-103.662538,41.864268,Y
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1010376,18th Street Farmers Market,825 18th Street,Charleston,Coles,Illinois,61920,-88.163254,39.490737,-
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@ -25,12 +25,12 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1005299,29th and Wharton Farmers' Market,29th and Wharton Streets,Philadelphia,Philadelphia,Pennsylvania,19146,-75.19204,39.9373,N
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1010994,2nd Street Farmers' Market,194 second street,Amherst,Amherst,Virginia,24521,-79.048573,37.583311,N
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1009959,2nd Street Market - Five Rivers MetroPark,600 E. 2nd Street,Dayton,Montgomery,Ohio,45402,-84.181030,39.762593,Y
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1004950,3 French Hens French Country Market,123 W. Illinois ave. ,Morris,Grundy,Illinois,60450,-88.425186,41.356383,Y
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1004950,3 French Hens French Country Market,123 W. Illinois Ave.,Morris,Grundy,Illinois,60450,-88.425186,41.356383,Y
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1010775,30A Farmers' Market,Rosmary Beach Town Center,Rosemary Beach,Walton,Florida,32461,-86.002754,30.279017,-
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1012342,31 & Main Farmers Market at Campus Town,1928 Pennington Road,Ewing,Mercer,New Jersey,08618,-74.783264,40.267025,Y
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1005636,32nd Street/Waverly Farmers Market,E. 32nd & Barclay Street,Baltimore,Baltimore,Maryland,21218,-76.611,39.3272,Y
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1005310,33rd and Diamond Farmers' Market,N 33rd and Diamond Streets,Philadelphia,Philadelphia,Pennsylvania,19121,-75.187167,39.988802,N
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1018014,38th & Meridian Farmer's Market ,3808 N Meridian St,Indianapolis,Marion,Indiana,46208,-86.1575468,39.8255595,-
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1018014,38th & Meridian Farmer's Market,3808 N Meridian St,Indianapolis,Marion,Indiana,46208,-86.1575468,39.8255595,-
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1012280,39 North Marketplace,Downtown Sparks Victorian Ave,Sparks,Washoe,Nevada,89431,-119.754962,39.534773,-
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1004414,3rd & Curry St. Farmers Market,3rd & Curry Street,Carson City,Carson City,Nevada,89703,-119.7678,39.16257,Y
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1011213,441 Ministries Farm Stand,441 Parsells Avenue,Rochester,Monroe,New York,14609,-77.5666043,43.1658344,N
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@ -41,7 +41,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1000060,57th Street Greenmarket,W 57 St. & 9 Ave,New York,New York,New York,10019,-73.985839,40.768159,N
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1005306,58th and Chester Farmers' Market,58th Street and Chester Avenue,Philadelphia,Philadelphia,Pennsylvania,19143,-75.228303,39.935721,N
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1011895,61st Street Farmers Market,6100 S Blackstone Ave,Chicago,Cook,Illinois,60637,-87.5905903,41.7841364,Y
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1012500,6th Street Market in Downtown Tempe,6th Street and Mill Avenue,Tempe ,Maricopa,Arizona,85281,-111.939512,33.424420,Y
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1012500,6th Street Market in Downtown Tempe,6th Street and Mill Avenue,Tempe,Maricopa,Arizona,85281,-111.939512,33.424420,Y
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1000061,79th Street Greenmarket,Columbus - W 78 & 81 Sts.,New York,New York,New York,10024,-73.9757,40.7818,N
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1000062,82nd Street Greenmarket,E 82nd St. - 1st & York Ave,New York,New York,New York,10028,-73.950090,40.773749,Y
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1008391,84 west farmers market (Dothan),,Dothan,Houston,Alabama,,-85.449944,31.232252,N
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@ -49,10 +49,10 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1000063,92nd Street Greenmarket,1st Ave - E 92nd & 93 Sts.,New York,New York,New York,10128,-73.946421,40.780931,Y
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1000064,97th Street Greenmarket,W 97 St. & Columbus,New York,New York,New York,10025,-73.9670120,40.7935600,N
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1011989,9th and Grand Farmers Market,304 West Grand Avenue,Salina,Saline,Kansas,67401,-97.6117504,38.8528359,N
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1000986,9th West Farmers Market/People's Market ,1060 South 900 West,SALT LAKE CITY,Salt Lake,Utah,84110,-111.9195223,40.7470177,N
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1010617,A + Organic Farmers Market,Lee Rd. Farm,Boynton Beach ,Palm Beach,Florida,33473,-80.221052,26.489351,Y
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1000986,9th West Farmers Market/People's Market,1060 South 900 West,SALT LAKE CITY,Salt Lake,Utah,84110,-111.9195223,40.7470177,N
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1010617,A + Organic Farmers Market,Lee Rd. Farm,Boynton Beach,Palm Beach,Florida,33473,-80.221052,26.489351,Y
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1001683,A Better Choice Bakery & Market,27 W Potomac Street,Brunswick,Frederick,Maryland,21716,-77.6277075,39.3130660,Y
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1009004,A Growers' Market,229 Lake Ella Drive,Tallahassee ,Leon,Florida,32303,-84.2792304,30.4624713,Y
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1009004,A Growers' Market,229 Lake Ella Drive,Tallahassee,Leon,Florida,32303,-84.2792304,30.4624713,Y
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1001887,AAFFA Community Farmers Market,402 North Murray Avenue,Anderson,Anderson,South Carolina,29624,-82.652159,34.506706,-
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1007585,AAMC Farmers's Market,"2001 Medical Parkway, Sajak Pavilion",Annapolis,Anne Arundel,Maryland,21401,-76.6123,39.006,-
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1004573,Abbeville Farmers Market,118 Trinity Street at Livery Stable,Abbeville,Abbeville,South Carolina,29620,-82.380242,34.177429,N
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@ -277,7 +277,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1005081,Arvada Farmers Market,57th St. & Olde Wadsworth St.,Arvada,Jefferson,Colorado,80002,-105.081455,39.800138,N
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1009285,Arvada Five Parks Farmers Market,13810 W. 85th Dr.,Arvada,,Colorado,80005,-105.155,39.8488,-
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1009272,Asbury Fresh,Kennedy Park (on Cookman Ave next to Ivan & Andys,Asbury Park,,New Jersey,07712,-74.0094,40.2164,-
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1004350,Asbury Park Carousel Farmers' Market, First and Ocean Avenue,Asbury Park,Monmouth,New Jersey,07712,-74.0007788,40.2193390,Y
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1004350,Asbury Park Carousel Farmers' Market,First and Ocean Avenue,Asbury Park,Monmouth,New Jersey,07712,-74.0007788,40.2193390,Y
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1000397,Ashboro Downtown Farmers Market,134 South Church Street,Asheboro,Randolph,North Carolina,28801,-79.8175,35.7049,-
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1002490,Ashburn (Chicago) Farmers Market,6700 S. Kedzie Ave.,Chicago,Cook,Illinois,60629,-87.626,41.8851,-
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1003061,Ashburn Farmers Market,"One Loudoun, 20357 Exchange St.",Ashburn,Loudoun,Virginia,20147,-77.454253,39.053581,Y
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@ -298,7 +298,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1006964,Ashley Farmers Market,"On East Main Street,",Ashley,McIntosh County,North Dakota,,-99.3684,46.0344,-
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1000836,Ashley Valley Farmers' Market (Vernal),Old Dinosaur Gardens on Main Street (~240East),Vernal,Uintah,Utah,,-109.524091666667,40.4557472222222,-
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1008599,Ashmont/Peabody Square Farmers Market,Ashmont MBTA Plaza,Dorchester,Suffolk,Massachusetts,02124,-71.064236,42.285528,-
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1004530,Ashotn Farmers Market,Off Main Street,Ashton,Fremont,Idaho,83420,-111.446,44.0714,-
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1004530,Ashton Farmers Market,Off Main Street,Ashton,Fremont,Idaho,83420,-111.446,44.0714,-
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1009244,Ashtabula Farmers Market,1119 Bridge Street,Ashtabula,,Ohio,44004,-80.7998,41.8995,-
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1004692,Aspen Grove Farmers' Market,7301 S Santa Fe Dr,Littleton,Arapahoe,Colorado,80120,-105.025219,39.585505,Y
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1005837,Aspen Saturday Market,East Hopkins and South Hunter,Aspen,Pitkin,Colorado,81611,-106.817,39.1894,-
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@ -307,7 +307,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1001245,ASU Regional Farmers Market,3300 Aggie Road,Jonesboro,Craighead,Arkansas,72401,-90.667327,35.840771,N
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1004818,ASUEP Natchez Farmers Market,199 St. Catherine Street,Natchez,Adams,Mississippi,39120,-91.384921,31.556011,N
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1009516,ATACs Capitan Farmers Market,115 Smokey Bear Blvd.,Capitan,,New Mexico,88316,-105.573,33.5455,-
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1009447,Atascadero Farmers Market,Albertson's parking lot on El Camino Real,Atascadero,,California,93422,-120.664,35.4858,-
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1009447,Atascadero Farmers Market,Albertson's parking lot on El Camino Real,Atascadero,,California,93422,-120.664,35.4858,-
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1003911,Atascadero Farmers Market,Morro Road & El Camino Real,Paso Robles,San Luis Obispo,California,93447,-120.667,35.4882,-
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1001294,Atascadero Main Street CFM,Palma & Entrada,Atascadero,San Luis Obispo,California,93422,-120.669,35.4901,-
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1002984,Atchison Farmers Market,Between 4th & 6th on Main St.,Atchison,Atchison,Kansas,66002,-95.119747,39.560806,N
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@ -397,7 +397,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1006519,Baltimore County Farmers' Market,2200 York Road,Lutherville=Timonium,Baltimore,Maryland,21093,-76.6264,39.4398,-
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1000790,Baltimore Farmers' Market,400 unit block of Saratoga Street,Baltimore,Baltimore City,Maryland,21210,-76.6214780,39.2929004,Y
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1001027,Bancroft Street Farmers Market,2702 S 10th St.,Omaha,,Nebraska,68114,-95.93,41.2339,-
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1010688,Bandera Farmers Market, 702 Main St,Bandera,Bandera,Texas,78003,-99.0742510,29.7277140,N
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1010688,Bandera Farmers Market,702 Main St,Bandera,Bandera,Texas,78003,-99.0742510,29.7277140,N
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1008053,Bangor Farmers Market,Center St. & Monroe St.,Bangor,Van Buren,Michigan,49056,-86.1090777,42.3123539,Y
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1012081,Bangor Farmers' Market,Corner of Franklin and Harlow Streets,Bangor,Penobscot,Maine,04401,-68.7716490,44.8039587,Y
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1012134,banning market night,1170 W Ramsey Street,banning,Riverside,California,92220,-116.8895240,33.9248970,-
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@ -411,7 +411,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
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1003082,Barker Farmers Market,"Main St., & Quaker Rd.",Barker,Niagara,New York,14012,-78.5548023,43.3301158,-
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1005428,Barker's Island Farmers Market,Highway 2\53 & Marina Drive,Superior,Douglas,Wisconsin,54880,-92.062100,46.722392,-
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1001604,Barnegat Farmers Market,East Bay Ave. and Rt. 9,Barnegat,Ocean,New Jersey,08005,-74.2225,39.7536,-
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1003211,Barnesville Farmers Market, 300 E.Church St.,Barnesville,Belmont,Ohio,43713,-81.1739,39.9881,-
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1003211,Barnesville Farmers Market,300 E.Church St.,Barnesville,Belmont,Ohio,43713,-81.1739,39.9881,-
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1000353,Barnesville/Lamar County Farmers Market,Market Street,Barnesville,Lamar,Georgia,30204,-84.1573,33.0515,-
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1002354,Barre Farmer's Market,,Barre,Worcester,Massachusetts,01005,-72.105138,42.421809,Y
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1010903,Barre Farmers Market,7 Jones Brother Way,Barre ,Washington,Vermont,05641,-72.5210670,44.2116630,Y
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@ -462,7 +462,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
|
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1006359,Beacon Farmers Market (Summer),"Ferry Dock, Train Station Parking Lot",Beacon,Dutchess,New York,12508,-73.985119,41.504816,Y
|
||||
1018020,Bean Blossom Farmers' Market,Corner St Rd 45 and St Rd 135,Bean Blossom,Morgan,Indiana,46160,-86.446203,39.4815289,-
|
||||
1009334,Bear Creek Farmers Market,CC Shook Park,Belmont,,Mississippi,38827,-88.2108,34.5108,-
|
||||
1010739,Beaumont Farmers Market,,"Beaumont, TX ",Jefferson,Texas,77707,-94.164226,30.067909,N
|
||||
1010739,Beaumont Farmers Market,,"Beaumont, TX",Jefferson,Texas,77707,-94.164226,30.067909,N
|
||||
1001275,"Beaumont Hospital Royal Oak, Farmers Market",3601 West Thirteen Mile Rd.,Royal Oak,Oakland,Michigan,48073,-83.191990,42.513900,N
|
||||
1001827,Beaver County Fruit Company I,Beaver County Courthouse parking lot,Beaver,Beaver,Pennsylvania,15009,-80.3239,40.7199,-
|
||||
1011675,Beaver Dam Farmer's Market,231 South Main,"Beaver Dam, Kentucky",Ohio,Kentucky,42320,-86.870931,37.400207,N
|
||||
@ -507,7 +507,7 @@ FMID,MarketName,street,city,County,State,zip,longitude,latitude,Organic
|
||||
1010259,Bellevue Farmers' Market,20th & Franklin,Bellevue,Sarpy,Nebraska,68005,-95.8936715,41.1396043,Y
|
||||
1004973,Bellflower Farmers Market,Oak & Clark Street,Bellflower,Los Angeles,California,90706,-118.134,33.8847,-
|
||||
1008140,Bellingham Farmers Market,1207 10th Street,Bellingham,Whatcom,Washington,98226,-122.469657,48.75262,Y
|
||||
1008824,Bellows Falls Farmers Market, Waypoint Center on the Island,Bellows Falls,Windham,Vermont,05101,-72.444878,43.135697,Y
|
||||
1008824,Bellows Falls Farmers Market,Waypoint Center on the Island,Bellows Falls,Windham,Vermont,05101,-72.444878,43.135697,Y
|
||||
1000940,Bellville Farmers Market,142 Park Place,Bellville,Richland,Ohio,44813,-82.5116,40.6198,-
|
||||
1009929,Belmar Fresh Market,Wadsworth & Alameda,Lakewood,Jefferson,Colorado,,-105.0813552,39.7111007,Y
|
||||
1005168,Belmond Area Farmers Market,Corner of 2nd Street NE & 1st Aveene NE,Belmond,Wright,Iowa,50421,-93.6155,42.8478,-
|
||||
|
||||
|
Can't render this file because it is too large.
|
@ -1009,9 +1009,34 @@ FROM farmers_markets markets JOIN us_counties_2019_shp census
|
||||
WHERE markets.county IS NULL
|
||||
ORDER BY census.statefp, census.name;
|
||||
|
||||
-- Note that this query also highlights a farmer's market that is mis-geocoded.
|
||||
-- Note that the query returns 496 rows; not all of the columns missing a county
|
||||
-- value have values present in the geog_point, latitude, and longitude columns.
|
||||
|
||||
-- Also, this query highlights a farmer's market that is mis-geocoded.
|
||||
-- Can you spot it?
|
||||
|
||||
-- 4. The nyc_yellow_taxi_trips table you created in Chapter 12 contains
|
||||
-- the longitude and latitude where each trip began and ended. Use PostGIS
|
||||
-- functions to turn the dropoff coordinates into a geometry type and
|
||||
-- count the state/county pairs where each drop-off occurred. As with the
|
||||
-- previous exercise, you’ll need to join to the us_counties_2019_shp table
|
||||
-- and use its geom column for the spatial join.
|
||||
|
||||
-- Answer:
|
||||
|
||||
SELECT census.statefp,
|
||||
census.name as county,
|
||||
count(*) AS dropoffs
|
||||
FROM nyc_yellow_taxi_trips taxi JOIN us_counties_2019_shp census
|
||||
ON ST_Within(
|
||||
ST_SetSRID(ST_MakePoint(taxi.dropoff_longitude, taxi.dropoff_latitude),4269)::geometry, census.geom
|
||||
)
|
||||
GROUP BY census.statefp, census.name
|
||||
ORDER BY count(*) DESC;
|
||||
|
||||
-- Thank you to reader Eric Mortenson for suggesting this exercise.
|
||||
|
||||
|
||||
----------------------------------------------------------------------------
|
||||
-- Chapter 16: Working with JSON Data
|
||||
----------------------------------------------------------------------------
|
||||
|
||||
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Reference in New Issue
Block a user