UM Geospatial Digital Special Collections

Citation: Census (2024). Miami-Dade 2020 Zip Code Tabulation Areas [gis dataset]. Census. https://www.census.gov/programs-surveys/geography/guidance/geo-areas/zctas.html. last updated: 2024-12-10 (update frequency: Never). Abstract: A polygon representation of the Miami-Dade Zip Code Tabulation Areas (ZCTA) boundaries (derived from us_2020_zcta). Key words: Miami-Dade, Zipcode, ZCTA Open Geospatial Consortium Standards: dynamic vector tiles | | WMS (coming soon) | WFS (coming soon) Analytical Functions: gdsc_get_attributes(tablename=mdc_2020_zcta,lat=25.718,lng=-80.279,identifier=geoid20,attrs=[ogc_fid,geoid20,zcta5ce20,classfp20,mtfcc20,aland20,awater20,funcstat20,intptlat20,intptlon20],normal='') ETL documentation

ETL for mdc_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/mdc_2020_zcta/{download,etl} && cd /data/mdc_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 # load into postGIS with: ogr2ogr -lco GEOMETRY_NAME=geom -f PostgreSQL PG:"" download/mdc_2020_zcta.shp -nlt multipolygon -nln mdc_2020_zcta ######### # Step 2 - SQL script (pseudo code): #### # remove duplicate points and make geometries valid: UPDATE mdc_2020_zcta SET geom=ST_MakeValid(ST_RemoveRepeatedPoints(geom));" # add local geometry column and reproject existing geometries into local EPSG: SELECT AddGeometryColumn ( 'mdc_2020_zcta', 'geom_local', 4269, 'multipolygon', 2 ); UPDATE mdc_2020_zcta SET geom_local=ST_MakeValid(ST_RemoveRepeatedPoints(ST_Transform(ST_Multi(geom), 4269))); CREATE INDEX mdc_2020_zcta_geom_local_idx ON mdc_2020_zcta USING GIST (geom_local); NOTIFY pgrst, 'reload schema';"