OpenStreetMap contributors (2023). Trinidad and Tobago Regions [gis dataset]. OpenStreetMap. last updated: 2026-10-19 (update frequency: As Needed). A polygon feature set for the regions of Trindad and Tobago sourced from OpenStreetMap. Key words: Trinidad and Tobago, Regions, Administrative Boundaries Open Geospatial Consortium Standards:

dynamic vector tiles

Analytical Functions:

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

ETL documentation

ETL for tt_regions

######### # 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/tt_regions/download -p /data/tt_regions/etl chmod -R 777 /data/tt_regions cd /data/tt_regions # 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 curl -o download/tt_regions.osm 'https://overpass-api.de/api/interpreter?data=rel%5B%22ISO3166-2%22~%22^TT%22%5D%5Badmin_level=4%5D%5Btype=boundary%5D%5Bboundary=administrative%5D;(._;>;);out;' 2>&1 # load into postGIS with: ogr2ogr -lco GEOMETRY_NAME=geom -f PostgreSQL PG:"" download/tt_regions.osm echo success: tt_regions.osm loaded with ogr2ogr ######### # Step 2 - SQL script (pseudo code): #### # Select proper geometry into the named table psql -d $POSTGRES_DB -U $POSTGRES_USER -p $POSTGRES_PORT -h gdsc-postgis-node-983e9smxmc5isvmo -c " SELECT * INTO tt_regions FROM multipolygons; DROP TABLE IF EXISTS lines; DROP TABLE IF EXISTS multilinestrings; DROP TABLE IF EXISTS multipolygons; DROP TABLE IF EXISTS other_relations; DROP TABLE IF EXISTS points;" # remove duplicate points and make geometries valid: UPDATE tt_regions SET geom=ST_MakeValid(ST_RemoveRepeatedPoints(geom)); # add local geometry column and reproject existing geometries into local EPSG: ALTER TABLE tt_regions DROP COLUMN IF EXISTS geom_local CASCADE; SELECT AddGeometryColumn ( 'tt_regions', 'geom_local', 8035, 'multipolygon', 2 ); UPDATE tt_regions SET geom_local=ST_MakeValid(ST_RemoveRepeatedPoints(ST_Transform(ST_Multi(geom),8035))); CREATE INDEX tt_regions_geom_local_idx ON tt_regions USING GIST (geom_local); NOTIFY pgrst, 'reload schema';