52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
Geocoding Summary
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Output file:
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US_DC_Sample_geocoded.csv
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What was added:
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- longitude
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- latitude
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- geocode_source
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- geocode_precision
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- geocode_status
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- geocode_match_address
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- Census audit fields
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- Nominatim/OpenStreetMap audit fields
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Results:
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- 249 total records
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- 204 records matched through the U.S. Census Geocoder
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- 45 records used city-level fallback coordinates from Nominatim/OpenStreetMap
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- 0 records are missing coordinates
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- Final CSV has 38 columns with consistent row width
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Precision notes:
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- Census matches are marked geocode_precision=address_range.
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- Census coordinates are interpolated address-range coordinates, not guaranteed rooftop or building-centroid coordinates.
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- Nominatim fallback records are marked geocode_precision=city.
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- City-level fallback coordinates should not be treated as facility-level locations.
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Status values:
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- census_match: Census returned a usable address match.
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- census_no_match_city_fallback: Census did not match the submitted street address, so city-level fallback coordinates were used.
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- census_tie_city_fallback: Census returned a tie, so city-level fallback coordinates were used instead of selecting one ambiguous address.
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- no_street_city_fallback: No usable street address was available, so city-level fallback coordinates were used.
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Repair note:
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Before geocoding, 3 records were repaired where a street address existed in source_address but had not been parsed into street_address.
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Supporting audit files:
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- census_address_results.csv
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- nominatim_city_cache.csv
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- US_DC_Sample_geocoding_base.csv
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- census_address_input.csv
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Source documentation:
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- U.S. Census Geocoder API:
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https://geocoding.geo.census.gov/geocoder/Geocoding_Services_API.html
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- Nominatim/OpenStreetMap usage policy:
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https://operations.osmfoundation.org/policies/nominatim/
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Attribution note:
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If the Nominatim/OpenStreetMap fallback coordinates are published or distributed, include appropriate OpenStreetMap attribution.
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