UM Geospatial Digital Special Collections

Citation: Miami-Dade County ETSD (2018). Miami-Dade Colleges [gis dataset]. Miami-Dade County. https://gis-mdc.opendata.arcgis.com/datasets/MDC::college/about. last updated: 2024-10-28 (update frequency: 1 year). Abstract: A point feature class of colleges and universities within Miami-Dade County. Key words: Florida, Miami-Dade County, MDC, Education, School, College, Population, Infrastructure Open Geospatial Consortium Standards: dynamic vector tiles | | WMS (coming soon) | WFS (coming soon) ESRI Standards: ArcGIS MapServer | ArcGIS FeatureServer | Open in ArcGIS Portal for GDSC Analytical Functions: gdsc_nearest_neighbor(table=mdc_colleges,lat=25.718,lng=-80.279,id=name) ETL documentation

ETL for mdc_colleges

######### # 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_colleges/{download,etl} && cd /data/mdc_colleges # 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 -O download/mdc_colleges.json 'https://services.arcgis.com/8Pc9XBTAsYuxx9Ny/arcgis/rest/services/College_gdb/FeatureServer/0/query?where=1%3D1&outFields=*&outSR=4326&f=json' # replace column names Shape__Length and Shape__Area to avoid conflict when # providing as service on ArcServer. sed -i 's/Shape__Length/shape_length/gI; s/Shape__Area/shape_area/gI' download/mdc_colleges.json # load into postGIS with: ogr2ogr -lco GEOMETRY_NAME=geom -f PostgreSQL PG:"" download/mdc_colleges.json -nlt point -nln mdc_colleges ######### # Step 2 - SQL script (pseudo code): #### # remove duplicate points and make geometries valid: UPDATE mdc_colleges SET geom=ST_MakeValid(ST_RemoveRepeatedPoints(geom));" # add local geometry column and reproject existing geometries into local EPSG: SELECT AddGeometryColumn ( 'mdc_colleges', 'geom_local',2236,'point',2 ); UPDATE mdc_colleges SET geom_local=ST_MakeValid(ST_RemoveRepeatedPoints(ST_Transform(geom,2236))); CREATE INDEX mdc_colleges_geom_local_idx ON mdc_colleges USING GIST (geom_local); NOTIFY pgrst, 'reload schema';"