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Contributing to OpenAddresses

Build Status

Reporting Sources & Issues

We'd love to hear about a new address source, fixes to an old one, or make improvements.

New Sources

Have a potential source? Fantastic! Follow these steps to help us get it into the project as fast as possible!

  • Check ./sources/ to make sure we don't have it already. Sources that overlap are ok as long as they are coming from different providers.
  • Check the wiki to make sure it isn't listed there

Still a new source? Awesome!

  • If the source is raster data (images/webmap/not downloadable) please add it to the Raster Wiki
  • If the source costs money, please add it to the Commercial Wiki
  • If the source is parcel data, please add it to the Parcel Wiki
  • If you have an awesome link/contact but no data, add it to the Outreach Wiki
  • Finally if you have raw data, open a issue and we'll add it for you or add it yourself

Confused? Not sure where your source fits in? Open an issue, we’d rather a duplicate than miss it altogether!

Errors & Current Sources

If you are reporting an error, an improvement, or a suggestion, create a github issue here We will do our best to review your issue and either fix or add the feature(s) to our plan.

Contributing Sources

Comfortable with JSON? Feel free to submit a pull request with the data instead of opening an issue. Before asking for a merge, please keep Travis CI happy by making sure you submit well-formed JSON: green is good!

For a first time contributer, getting the JSON right can be a bit of a challenge, check out other sources in ./sources/ to get an idea of what we are looking for. Still confused? Open an issue, we’ll be happy to help you out!

Naming Files

Although the file name is redundant (the same information is stored in JSON), using coherent file names makes it much easier for contributers to quickly evaluate whether a source already exists. Please follow the following convention

Coverage Code Example
Country ISO 3166-1 alpha-2 Country Code ca.json
Province ISO 3166-2 alpha-2 SubRegion Code us-il.json
County Standard Name (Use underscores for spaces) us-co-routt.json
City Standard Name (Use underscores for spaces) ca-bc-city_of_vancouver.json

JSON Tags

Sources use a standard set of attributes to allow for machine processing of each source. Use these tags where applicable. Check out other sources in the ./sources/ directory for examples

Core Tags

Our testing platform, Travis CI, enforces required tags. These represent the minimum data required to process a source. If you are not able to provide the required tags, file an issue instead of a pull request. We’ll determine if the data is suitable for inclusion.

Tag Required? Note
data Yes A URL referencing the dataset. This should point to the raw data and not a web portal.
type Yes A string containing the protocol (One of: http, ftp, ESRI)
coverage Yes An object containing some combination of country, state, and either city or county. Each of which contain a String. See below for more details
conform Optional Object used to find address information in a source. See below for more details.
compression Optional string containing the compression type (usually zip). Omit if source is not compressed.

Conform Object

Although a conform Object is not a mandatory part of a source, it must be present for the source to be added into the end address file. This JSON Object tells the processing software how to handle the format as well as mapping fields to a standard set.

Conform contains tags for preparing data and tags for converting it. They are called Processing Tags and Attribute Tags.

Processing Tags
Tag Required? Note
type Yes The type properties stores the format. It can currently be one of shapefile, shapefile-polygon, csv, geojson, or xml (for GML).
merge=["one",…,"nth"] The merge tag will merge several fields together. This is typically something along the lines of street-name and street-type fields. The merged field will be named auto_street.
split Some databases give the number and street in one field. The split tag will split the number and the street. The resulting fields will be auto_street and auto_number.
advanced_merge Can be used to merge fields more arbitrarily. See Below.
srs Allows one to set a custom source srs. Currently only supported by type:shapefile, type:shapefile-polygon, and type:csv. Should be in the format of EPSG:#### and can be any code supported by ogr2ogr. Modern shapefiles typically store their project in a .prj file. If this file exists, this tag should be omitted.
file The majority of zips contain a single shapefile. Sometimes zips will contain multiple files, or the shapefile that is needed is located in a folder hierarchy in the zip. Since the program only supports determining single shapefiles not in a subfolder, file can be used to point the program to an exact file. The proper syntax would be "file": "addresspoints/address.shp" if the file was under a single subdirectory called addresspoints. Note there is no preceding forward slash.
encoding A character encoding from which an input file will first be converted (into utf-8). Must be recognizable by iconv.
csvsplit The character to delimit input CSV’s by. Defaults to comma.
headers (type 'csv' only) Some non-latin CSVs provide header lines in native script and in latin characters. If specified, this tag determines which line will be used to determine field names for other conform tags. If not specified, row 1 is assumed. Alternately, if a CSV file lacks headers, setting headers=-1 will add them. The autogenerated fields will be named COLUMN1, COLUMN2, COLUMN3 ... COLUMN10, COLUMN11 etc.
skiplines (type 'csv' only) May be used in conjunction with headers (see above). For example, if headers is 1 but a second header line exists and must be skipped.
Attribute Tags

If using a text processing tag above, the results can usually be found in the generated auto_number or auto_street fields unless otherwise noted. Field names are case insensitive, but contributers are encouraged to try to match the case.

Tag Required? Note
number Yes The name of the number field. This will either be the name of the field or auto_number if the split tool was used.
street Yes The name of the street field. This will either be the name of the field or auto_street if the split or merge tools were used.
lon The longitude column. This is required for CSV sources and should be omitted for other types.
lat The latitude field. This is required for CSV sources and should be omitted for other types.
accuracy The accuracy of the data source. See table below. Should never be 0, defaults to 5. If this is not set, address duplicates of higher accuracy will replace the addresses from this source when they are conflated.
city Name of the City or Municipality in which the address falls
postcode Postcode or zip-code field in which the address falls
district District/County/Sub-Region in which the address falls
region State/Region/Province in which the address falls
addrtype Type of address. industrial, residential, etc.
notes Legal description of address or notes about the property.
Accuracy
ID Type
0 User Corrected
1 Rooftop
2 On Parcel
3 Driveway
4 Interpolation
5 Unknown
Advanced Merge

This is sometimes necessary for the street number equivalent in Asian addressing systems. The following example will add fields to the output CSV named custom_number and auto_street that contained merged contents of the forms STREET_A-STREET_B-STREET_C and ROAD_A ROAD_B, respectively:

"conform": {
    "advanced_merge": {
        "custom_number": {
            "separator": "-",
            "fields": ["STREET_A", "STREET_B", "STREET_C"]
        },
        "auto_street": {
            "separator": " ",
            "fields": ["ROAD_A", "ROAD_B"]
        }
    }
}

Coverage Object

Although a coverage Object is not a mandatory part of a source, its presence provides hints about the geographic extent of the address file and is used to render the map at data.openaddresses.io.

This object minimally contains some combination of country, state, and either city or county, all strings

If one of the following tags are provided, it will be used to render the source to the map at data.openaddresses.io:

  1. US Census with geoid containing two-digit state or five-digit county FIPS code. See Alameda County and Virginia for examples.
  2. ISO 3166 with alpha2 containing alphanumeric two-letter ISO-3166-1 country code or ISO-3166-2 subdivision code. See New Zealand, Victoria, Australia, or Dolnośląskie, Poland for examples.
  3. geometry with Polygon or MultiPolygon type unprojected GeoJSON geometry object.

Optional Tags

Although these tags are optional, their inclusion is very much appreciated. Additional metadata helps future proof the project!

Tag Note
website A URL referencing the data portal
license A URL or string describing the license for the dataset
note A String containing a human readable note.
attribution Where the license requires attribution, add it here. example CC-BY United Federation of Planets
email This email is used to send automated emails to the data provider if a user changes their data. Do not set unless the data provider wants to receive updates.

Example

{
    "coverage": {
        "country": "ca",
        "state": "nb"
    },
    "data": "http://geonb.snb.ca/downloads/gcadb/geonb_gcadb-bdavg_shp.zip",
    "website": "http://www.snb.ca/geonb1/e/DC/catalogue-E.asp",
    "license": "http://geonb.snb.ca/downloads/documents/geonb_license_e.pdf",
    "type": "http",
    "compression": "zip",
    "conform": {
        "lon": "x",
        "lat": "y",
        "number": "civic_num",
        "street": "street_nam",
        "type": "shapefile",
        "accuracy": 3
    }
}

Formatting:

A few notes on formatting:

  • If a tag is empty please do not set it to null or an empty string. Omit it entirely.
  • No commas at the beginning of a line, only at the end.
  • Four spaces for indents (No tabs!)
  • No Blank lines

Although these are read by a machine, they are maintained by us mortals. Following the formatting guidelines keeps the rest of us sane!