Geocoding
This is the one hard part about going open source geo.
- Yonder - Compare geocoding results from multiple providers.
- GeoPy - Python library has a Yahoo and some opensource options.
- https://github.com/straup/js-geocoder
- https://github.com/straup/js-geolocation
- https://github.com/straup/js-reversegeocoder
- Edina Unlock - Excels with historic places but also uses modern UK data, and global modern places via GeoNames.org and Natural Earth.
- OSM Nominatim - Used in OpenStreetMap, tied to OSM data.
- OSM Imposm.geocoder - Optimized for German addresses.
- MapQuest's version of Nominatim - Warning, assumes USA addresses.
- GeoCommons GeoCoder - an open-source Geocoder using open data mostly just for the US using Census geography files
- Gisgraphy - an open-source Geocoder using open data
###Not a batch geocoder, but useful:
- http://aaronland.info/iamhere/ - Decimal degrees, DDMMSS, geohash, and WOE ID place reverse geocode.
- Geonames Reverse Geocoder services list
###What's in a location?###
Location Types:
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Street Address: - An address consists of a street number, a street name, and a quadrant (NE, NW, SE, SW). The address number and street name are required. Example: 441 4th ST NW
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Intersection: - An Intersection consists of two streets. Example: 14th ST NW and Pennsylvania Avenue NW, or 14th ST NW & Pennsylvania Avenue NW, or 16th ST NW over Military RD NW, or Military RD NW under 16th ST NW
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Block: - A block consists of a street and any other cross streets. Example: 4th ST NW from D Street NW to E Street NW or 400 Block of 4th St NW
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Place Name: - A place name consists of common place names (neighborhoods etc.) and public/institutional building names. Example: "White House" or "Dupont Circle" or "Wilson Building" or "Wilson High School" or "Woodrow Wilson House"
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Cities: - Both incorporated and unincorporated.
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Zipcodes: - Used for postal routing.
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States, counties, countries: - Other administrative units.
Image source: DC MAR