U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Spatial Data Collection and Products Branch (2024). USA 2020 Zip Code Tabulation Areas [gis dataset]. Census. last updated: 2024-12-02 (update frequency: Never). A polygon representation of the US Zip Code Tabulation Areas (ZCTA) boundaries. Key words: USA, Zipcode, ZCTA Open Geospatial Consortium Standards:

dynamic vector tiles

Analytical Functions:

gdsc_get_attributes( table, lat, lng, identifier, normal )

ETL documentation

ETL for us_2020_zcta

######### # GDSC ETL is performed in two steps: shell script to ETL data into postgres # and then additional transformations with SQL in postGIS (if needed). #### ######### # Step 1 - bash script (pseudo code) #### # create directory structure and move into it mkdir -p /data/us_2020_zcta/download -p /data/us_2020_zcta/etl chmod -R 777 /data/us_2020_zcta cd /data/us_2020_zcta # set update flag based on last update and update frequency do_update=0 if date() < last_update + update_frequency else do_update = 1 # download if update flag is set: if do_update == 1 then wget --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 10 -O download/us_2020_zcta.zip 'ftp://ftp2.census.gov/geo/tiger/TIGER2020/ZCTA520/tl_2020_us_zcta520.zip' 2>&1 # unzip to download directory if update flag is set if do_update == 1 then unzip -o download/us_2020_zcta.zip -d download && rm download/us_2020_zcta.zip 2>&1 # load into postGIS with: ogr2ogr -lco GEOMETRY_NAME=geom -f PostgreSQL PG:"" download/tl_2020_us_zcta520.shp -nlt multipolygon -nln us_2020_zcta echo success: tl_2020_us_zcta520.shp loaded with ogr2ogr ######### # Step 2 - SQL script (pseudo code): #### # remove duplicate points and make geometries valid: UPDATE us_2020_zcta SET geom=ST_MakeValid(ST_RemoveRepeatedPoints(geom)); # add local geometry column and reproject existing geometries into local EPSG: ALTER TABLE us_2020_zcta DROP COLUMN IF EXISTS geom_local CASCADE; SELECT AddGeometryColumn ( 'us_2020_zcta', 'geom_local', 4269, 'multipolygon', 2 ); UPDATE us_2020_zcta SET geom_local=ST_MakeValid(ST_RemoveRepeatedPoints(ST_Transform(ST_Multi(geom),4269))); CREATE INDEX us_2020_zcta_geom_local_idx ON us_2020_zcta USING GIST (geom_local); NOTIFY pgrst, 'reload schema';